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devel / sci.crypt / Re: base26 Encoder/Decoder

SubjectAuthor
* base26 Encoder/DecoderStefan Claas
`* Re: base26 Encoder/DecoderCri-Cri
 +* Re: base26 Encoder/DecoderStefan Claas
 |`* Re: base26 Encoder/DecoderCri-Cri
 | `- Re: base26 Encoder/DecoderStefan Claas
 `* Re: base26 Encoder/DecoderStefan Claas
  `* Re: base26 Encoder/DecoderStefan Claas
   +* Re: base26 Encoder/DecoderStefan Claas
   |`* Re: base26 Encoder/DecoderStefan Claas
   | `- Re: base26 Encoder/DecoderStefan Claas
   `* Re: base26 Encoder/DecoderCri-Cri
    `* Re: base26 Encoder/DecoderStefan Claas
     `* Re: base26 Encoder/DecoderCri-Cri
      `* Re: base26 Encoder/DecoderStefan Claas
       +- Re: base26 Encoder/DecoderStefan Claas
       `* Re: base26 Encoder/DecoderHerbert Kleebauer
        `* Re: base26 Encoder/DecoderStefan Claas
         +- Re: base26 Encoder/DecoderStefan Claas
         `* Re: base26 Encoder/DecoderHerbert Kleebauer
          +- Re: base26 Encoder/DecoderStefan Claas
          `* Re: base26 Encoder/DecoderStefan Claas
           `* Re: base26 Encoder/DecoderStefan Claas
            `* Re: az - Telefax/OCR Test (was: base26 Encoder/Decoder)Stefan Claas
             `* Re: az - Telefax/OCR TestHerbert Kleebauer
              `* Re: az - Telefax/OCR TestStefan Claas
               `* Re: az - Telefax/OCR TestHerbert Kleebauer
                `* Re: az - Telefax/OCR TestStefan Claas
                 `* Re: az - Telefax/OCR TestStefan Claas
                  `* Re: az - Telefax/OCR TestStefan Claas
                   `- Re: az - Telefax/OCR TestStefan Claas

Pages:12
base26 Encoder/Decoder

<uoekm1$3rhsc$1@i2pn2.org>

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Path: i2pn2.org!.POSTED!not-for-mail
From: stefan@mailchuck.com (Stefan Claas)
Newsgroups: sci.crypt
Subject: base26 Encoder/Decoder
Date: Fri, 19 Jan 2024 21:05:20 +0100
Organization: i2pn2 (i2pn.org)
Message-ID: <uoekm1$3rhsc$1@i2pn2.org>
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 by: Stefan Claas - Fri, 19 Jan 2024 20:05 UTC

Hi all,

if you like the Diana Cryptosystem and want to
use it with a foreign language, on an offline
Computer, you may find my base26 Encoder/Decoder
useful.

https://github.com/stefanclaas/base26

Regards
Stefan
--
----Ed25519 Signature----
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d3a4ab324a690e10856c4d52024daa849e100f0a1604dbc8dd46f69f169db305

Re: base26 Encoder/Decoder

<g74JN.751237$mUo.609280@fx08.ams4>

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From: cri@cri.cri.invalid (Cri-Cri)
Subject: Re: base26 Encoder/Decoder
Newsgroups: sci.crypt
References: <uoekm1$3rhsc$1@i2pn2.org>
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Date: Fri, 15 Mar 2024 22:40:12 GMT
X-Received-Bytes: 1170
 by: Cri-Cri - Fri, 15 Mar 2024 22:40 UTC

On Fri, 19 Jan 2024 21:05:20 +0100, Stefan Claas wrote:

> if you like the Diana Cryptosystem and want to use it with a foreign
> language, on an offline Computer, you may find my base26 Encoder/Decoder
> useful.

Found a Python version:
https://pypi.org/project/base26/#files

Example:

>>> import base26
>>> base26.encode(b'test')
'EWJILIG'
>>> base26.decode('EWJILIG')
b'test'

--
Cri-Cri

Re: base26 Encoder/Decoder

<ut46u4$22l08$1@i2pn2.org>

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From: pollux@tilde.club (Stefan Claas)
Newsgroups: sci.crypt
Subject: Re: base26 Encoder/Decoder
Date: Sat, 16 Mar 2024 14:30:45 +0100
Organization: i2pn2 (i2pn.org)
Message-ID: <ut46u4$22l08$1@i2pn2.org>
References: <uoekm1$3rhsc$1@i2pn2.org>
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Gemini: tilde.club/~pollux/
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 by: Stefan Claas - Sat, 16 Mar 2024 13:30 UTC

Cri-Cri wrote:

> On Fri, 19 Jan 2024 21:05:20 +0100, Stefan Claas wrote:
>
> > if you like the Diana Cryptosystem and want to use it with a foreign
> > language, on an offline Computer, you may find my base26
> > Encoder/Decoder useful.
>
> Found a Python version:
> https://pypi.org/project/base26/#files
>
> Example:
>
> >>> import base26
> >>> base26.encode(b'test')
> 'EWJILIG'
> >>> base26.decode('EWJILIG')
> b'test'
>

Interesting, but the output differs from mine.

$ echo -n 'test' | base26
MEXDLEME

I guess there is no defined standard (RFC) for
base26, maybe I am wrong.

Regards
Stefan
--
----Ed25519 Signature----
6c34fa71ca251de62392a9753b6f7481817f7c89dcca433cd9f6e5a9211d233a
5a08cbd84d9a99b018f2705416ebac3dde33bf38bd35ca106c8a71cee9e45e0e

Re: base26 Encoder/Decoder

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From: cri@cri.cri.invalid (Cri-Cri)
Subject: Re: base26 Encoder/Decoder
Newsgroups: sci.crypt
References: <uoekm1$3rhsc$1@i2pn2.org> <g74JN.751237$mUo.609280@fx08.ams4>
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Date: Sat, 16 Mar 2024 19:48:00 GMT
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 by: Cri-Cri - Sat, 16 Mar 2024 19:48 UTC

On Sat, 16 Mar 2024 14:30:45 +0100, Stefan Claas wrote:

> $ echo -n 'test' | base26 MEXDLEME
>
> I guess there is no defined standard (RFC) for base26, maybe I am wrong.

There ought to be. But, of course, maybe none of the math heads thinking
these things through have returned with the verdict from their round table
meeting yet? ;)

Not sure what either of you guys used, but this page:
https://www.dcode.fr/base-26-cipher
....claims there are two ways to start: A=0 or A=1

Maybe that?

He has a "machine" on his site you can compare things with. But it returns
the result in numeric Base26, not as encoded letters:

this here is a test
338902 126182 226 0 337135

Also, Python starts its arrays/lists with 0 for the first item where some
other languages use 1. I have no idea what "Go" (was it?) uses.

If I get a little free time I'll probably check the Python module against
that page (linked above). It was fairly short.

I've been fiddling with the HC-9 cipher that came out of that handy little
machine the Swedish military used up until around 1995-ish. I've got some
info about that coding from that site, it is very informative. So I'm
currently all "ciphered out" and I want to spend some time with some other
things for a while. :)

--
Cri-Cri

Re: base26 Encoder/Decoder

<ut4ugf$23pnb$1@i2pn2.org>

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From: pollux@tilde.club (Stefan Claas)
Newsgroups: sci.crypt
Subject: Re: base26 Encoder/Decoder
Date: Sat, 16 Mar 2024 21:13:03 +0100
Organization: Chiffrepunks
Message-ID: <ut4ugf$23pnb$1@i2pn2.org>
References: <uoekm1$3rhsc$1@i2pn2.org>
<g74JN.751237$mUo.609280@fx08.ams4>
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Gemini: tilde.club/~pollux/
 by: Stefan Claas - Sat, 16 Mar 2024 20:13 UTC

Cri-Cri wrote:

> On Sat, 16 Mar 2024 14:30:45 +0100, Stefan Claas wrote:
>
> > $ echo -n 'test' | base26 MEXDLEME
> >
> > I guess there is no defined standard (RFC) for base26, maybe I am
> > wrong.
>
> There ought to be. But, of course, maybe none of the math heads
> thinking these things through have returned with the verdict from
> their round table meeting yet? ;)
>
> Not sure what either of you guys used, but this page:
> https://www.dcode.fr/base-26-cipher
> ...claims there are two ways to start: A=0 or A=1
>
> Maybe that?
>
> He has a "machine" on his site you can compare things with. But it
> returns the result in numeric Base26, not as encoded letters:
>
> this here is a test
> 338902 126182 226 0 337135

I saw that french page and ys it uses digits as output, which I don not
want, because of using my output (from Unicode chars) for the Diana
Cryptosystem.
> Also, Python starts its arrays/lists with 0 for the first item where
> some other languages use 1. I have no idea what "Go" (was it?) uses.

Yes, it is Go Code and starts at 0.
> If I get a little free time I'll probably check the Python module
> against that page (linked above). It was fairly short.
>
>
> I've been fiddling with the HC-9 cipher that came out of that handy
> little machine the Swedish military used up until around 1995-ish.
> I've got some info about that coding from that site, it is very
> informative. So I'm currently all "ciphered out" and I want to spend
> some time with some other things for a while. :)

HC-9, must admit, never heart of it but sounds interesting. I have to
read about it.

--
Stefan

Re: base26 Encoder/Decoder

<v0dtc5$276id$1@i2pn2.org>

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From: pollux@tilde.club (Stefan Claas)
Newsgroups: sci.crypt
Subject: Re: base26 Encoder/Decoder
Date: Thu, 25 Apr 2024 17:37:40 +0200
Organization: i2pn2 (i2pn.org)
Message-ID: <v0dtc5$276id$1@i2pn2.org>
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Finger: tilde.club/~pollux/
 by: Stefan Claas - Thu, 25 Apr 2024 15:37 UTC

Cri-Cri wrote:

> On Fri, 19 Jan 2024 21:05:20 +0100, Stefan Claas wrote:
>
> > if you like the Diana Cryptosystem and want to use it with a foreign
> > language, on an offline Computer, you may find my base26 Encoder/Decoder
> > useful.
>
> Found a Python version:
> https://pypi.org/project/base26/#files
>
> Example:
>
> >>> import base26
> >>> base26.encode(b'test')
> 'EWJILIG'
> >>> base26.decode('EWJILIG')
> b'test'
>

I now have a Rust Version, derived from the Python library and
it encodes 'test' with the same result, but when encoding with
Rust, the Python code can not decode properly, while decoding
from Python with Rust works. Oh, well ... :-(
(Wish I was a Programmer!)

--
Regards
Stefan

Re: base26 Encoder/Decoder

<v0dup1$276id$2@i2pn2.org>

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From: pollux@tilde.club (Stefan Claas)
Newsgroups: sci.crypt
Subject: Re: base26 Encoder/Decoder
Date: Thu, 25 Apr 2024 18:01:36 +0200
Organization: i2pn2 (i2pn.org)
Message-ID: <v0dup1$276id$2@i2pn2.org>
References: <uoekm1$3rhsc$1@i2pn2.org>
<g74JN.751237$mUo.609280@fx08.ams4>
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Finger: tilde.club/~pollux/
 by: Stefan Claas - Thu, 25 Apr 2024 16:01 UTC

Stefan Claas wrote:

> Cri-Cri wrote:
>
> > On Fri, 19 Jan 2024 21:05:20 +0100, Stefan Claas wrote:
> >
> > > if you like the Diana Cryptosystem and want to use it with a foreign
> > > language, on an offline Computer, you may find my base26 Encoder/Decoder
> > > useful.
> >
> > Found a Python version:
> > https://pypi.org/project/base26/#files
> >
> > Example:
> >
> > >>> import base26
> > >>> base26.encode(b'test')
> > 'EWJILIG'
> > >>> base26.decode('EWJILIG')
> > b'test'
> >
>
> I now have a Rust Version, derived from the Python library and
> it encodes 'test' with the same result, but when encoding with
> Rust, the Python code can not decode properly, while decoding
> from Python with Rust works. Oh, well ... :-(
> (Wish I was a Programmer!)

Ok, I figured out that my Python3 code example is bad. So the
Rust Version works the same as the library. :-)

$ python3
Python 3.9.2 (default, Feb 28 2021, 17:03:44)
[GCC 10.2.1 20210110] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import base26
>>> base26.encode(b'The quick brown fox jumps over the lazy dog.')
'AAZCESYRPSBENRDWLUQLYETYZZJCPAHHAVEIPLIONRSBHYUEHANMAUZZQCSOGOXJEBILDQVWRGD'
>>>
$ echo -n 'AAZCESYRPSBENRDWLUQLYETYZZJCPAHHAVEIPLIONRSBHYUEHANMAUZZQCSOGOXJEBILDQVWRGD' | b26 -d
The quick brown fox jumps over the lazy dog.
$ echo -n 'Hello sci.crypt' | b26
UQZGYLNMDHTUDTGJYKJRQGDKOC

$ python3
Python 3.9.2 (default, Feb 28 2021, 17:03:44)
[GCC 10.2.1 20210110] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import base26
>>> base26.decode('UQZGYLNMDHTUDTGJYKJRQGDKOC')
b'Hello sci.crypt'
>>>

Ok. everything is fine. :-)

--
Regards
Stefan

Re: base26 Encoder/Decoder

<v0e01k$27aev$1@i2pn2.org>

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From: pollux@tilde.club (Stefan Claas)
Newsgroups: sci.crypt
Subject: Re: base26 Encoder/Decoder
Date: Thu, 25 Apr 2024 18:23:15 +0200
Organization: i2pn2 (i2pn.org)
Message-ID: <v0e01k$27aev$1@i2pn2.org>
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 by: Stefan Claas - Thu, 25 Apr 2024 16:23 UTC

Stefan Claas wrote:

[...]

> Ok. everything is fine. :-)

Example Unicode text encoded, with -l Parameter for line-length:

SASHXTRHYGJXHJBMKMWLUPZPTINOBPKNFSPZNFBWWXLWUNFRSGZHPACWHNFRFTGR
PRSLUVEMZDVQNMVIQPSEVCTOULWNLUQQPWABOAWITQCANZDPJFCOHIYYWGXIHYAJ
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HEXYHTNLVLYCESEIOGJZEYAGOVLJZPLNVQQHBHREDBODCXXUTQVOQVEOTLMZIXWK
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Click here to read the complete article
Re: base26 Encoder/Decoder

<v0gkkj$2afqc$1@i2pn2.org>

  copy mid

http://rslight.i2p/devel/article-flat.php?id=912&group=sci.crypt#912

  copy link   Newsgroups: sci.crypt
Path: i2pn2.org!.POSTED!not-for-mail
From: pollux@tilde.club (Stefan Claas)
Newsgroups: sci.crypt
Subject: Re: base26 Encoder/Decoder
Date: Fri, 26 Apr 2024 18:26:57 +0200
Organization: i2pn2 (i2pn.org)
Message-ID: <v0gkkj$2afqc$1@i2pn2.org>
References: <uoekm1$3rhsc$1@i2pn2.org>
<g74JN.751237$mUo.609280@fx08.ams4>
<v0dtc5$276id$1@i2pn2.org>
<v0dup1$276id$2@i2pn2.org>
<v0e01k$27aev$1@i2pn2.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Injection-Date: Fri, 26 Apr 2024 16:26:59 -0000 (UTC)
Injection-Info: i2pn2.org;
logging-data="2441036"; mail-complaints-to="usenet@i2pn2.org";
posting-account="uWi4uQdALkj7ETOfPbhNXfz0+Ra/gM5z6/Fa40dJi9U";
X-Spam-Checker-Version: SpamAssassin 4.0.0
Finger: tilde.club/~pollux/
 by: Stefan Claas - Fri, 26 Apr 2024 16:26 UTC

Stefan Claas wrote:

> Stefan Claas wrote:
>
> [...]
>
> > Ok. everything is fine. :-)
>
> Example Unicode text encoded, with -l Parameter for line-length:
>
> SASHXTRHYGJXHJBMKMWLUPZPTINOBPKNFSPZNFBWWXLWUNFRSGZHPACWHNFRFTGR

Another example, an encrypted SMS message, done with Adiantum (FPE)
and base26 encoded and grouped in five letter groups.

JFMLM THPBQ RDZJD KTZEJ MOGKY BPCIY LTHNL FNSBA

This allows one to create SMS messages on a little offline notebook
and type it in an old mobile phone, or use, for example, Modem-Manager-GUI
under Linux, to send encrypted SMS messages.

P.S. Looks now like a Diana Cryptosystem message. ;-)

--
Regards
Stefan

Re: base26 Encoder/Decoder

<v0h02v$2aujl$1@i2pn2.org>

  copy mid

http://rslight.i2p/devel/article-flat.php?id=913&group=sci.crypt#913

  copy link   Newsgroups: sci.crypt
Path: i2pn2.org!.POSTED!not-for-mail
From: pollux@tilde.club (Stefan Claas)
Newsgroups: sci.crypt
Subject: Re: base26 Encoder/Decoder
Date: Fri, 26 Apr 2024 21:42:23 +0200
Organization: i2pn2 (i2pn.org)
Message-ID: <v0h02v$2aujl$1@i2pn2.org>
References: <uoekm1$3rhsc$1@i2pn2.org>
<g74JN.751237$mUo.609280@fx08.ams4>
<v0dtc5$276id$1@i2pn2.org>
<v0dup1$276id$2@i2pn2.org>
<v0e01k$27aev$1@i2pn2.org>
<v0gkkj$2afqc$1@i2pn2.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
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Finger: tilde.club/~pollux/
 by: Stefan Claas - Fri, 26 Apr 2024 19:42 UTC

Stefan Claas wrote:

> Stefan Claas wrote:
>
> > Stefan Claas wrote:
> >
> > [...]
> >
> > > Ok. everything is fine. :-)
> >
> > Example Unicode text encoded, with -l Parameter for line-length:
> >
> > SASHXTRHYGJXHJBMKMWLUPZPTINOBPKNFSPZNFBWWXLWUNFRSGZHPACWHNFRFTGR
>
> Another example, an encrypted SMS message, done with Adiantum (FPE)
> and base26 encoded and grouped in five letter groups.
>
> JFMLM THPBQ RDZJD KTZEJ MOGKY BPCIY LTHNL FNSBA
>
> This allows one to create SMS messages on a little offline notebook
> and type it in an old mobile phone, or use, for example, Modem-Manager-GUI
> under Linux, to send encrypted SMS messages.
>
> P.S. Looks now like a Diana Cryptosystem message. ;-)
>

Added Windows Release.

https://github.com/stefanclaas/base26

--
Regards
Stefan

Re: base26 Encoder/Decoder

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From: cri@cri.cri.invalid (Cri-Cri)
Subject: Re: base26 Encoder/Decoder
Newsgroups: sci.crypt
References: <uoekm1$3rhsc$1@i2pn2.org> <g74JN.751237$mUo.609280@fx08.ams4>
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 by: Cri-Cri - Sat, 27 Apr 2024 13:10 UTC

On Thu, 25 Apr 2024 18:01:36 +0200, Stefan Claas wrote:

> Ok, I figured out that my Python3 code example is bad.

I took the example that French site had and made this, a very naive
approach to see what all the fuss is about. I used all strings and
converted to an fro integer where needed:

#---copy from here---------------------------
"""
1. get input string
2. convert this to base 10, where A=0
3. length of input string, gives you the exponent to use for each step
"""

# STEP #1
s = input('text: ').upper()
print(s)

# STEP #2
i = []
for c in s:
i.append(str(ord(c)-65).zfill(2))

# STEP #3
i.reverse()
r = []
for e in range(len(s)):
r.append(str(int(i[e])*26**e).zfill(2))
print(sum([int(t) for t in r]))
#---copy to here---------------------------

Example output:

$ python test_b26.py
text: dcode
DCODE
1415626 <<

That number can then be encoded into text, simplest is using one digit for
each letter:

''.join([chr(int(c)+65) for c in str(result)]) -> BEBFGCG

Whether or not this is the "correct" way of doing it, well, ...

"""
https://www.dcode.fr/base-26-cipher
To code DCODE, written in base 26, convert it to base 10:
D=3, C=2, O=14, D=3, E=4 which means that:
3×26⁴+2×26³+14×26²+3×26¹+4×26⁰=1415626 <<
"""

What I fail to understand in the original Base26 Python module is, why the
need for the things at the top:

NOM = 851
DENOM = 500

Looks like magic numbers to me.

The 'A' becoming zero problem my short example code handles such:

$ python test_b26.py
text: ape
APE
394
DJE

That French site said "0394". So, some corrections have to be added to my
naive code, I suppose it should have been ADJE as output, but I'll leave
that part as en exercise for my readers. ;)

--
Cri-Cri

Re: base26 Encoder/Decoder

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From: pollux@tilde.club (Stefan Claas)
Newsgroups: sci.crypt
Subject: Re: base26 Encoder/Decoder
Date: Sat, 27 Apr 2024 17:31:29 +0200
Organization: i2pn2 (i2pn.org)
Message-ID: <v0j5oi$2ddq4$1@i2pn2.org>
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 by: Stefan Claas - Sat, 27 Apr 2024 15:31 UTC

Cri-Cri wrote:
> What I fail to understand in the original Base26 Python module is, why the
> need for the things at the top:
>
> NOM = 851
> DENOM = 500
>
> Looks like magic numbers to me.

I asked that myself and the answer, from AI, is:

In this code, NOM and DENOM stand for “numerator” and “denominator”. They are used to calculate the length of the output when the input is being encoded or decoded.

These calculations ensure that the length of the output is correctly rounded. The values of NOM and DENOM are chosen to reflect the ratio between the length of the input and the length of the output in the Base26 encoding.

In this case, NOM = 851 and DENOM = 500, which means that the length of the output is about 85.1% of the length of the input when the input is being encoded, and about 58.8%
of the length of the input when the input is being decoded.

--
Regards
Stefan

Re: base26 Encoder/Decoder

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Subject: Re: base26 Encoder/Decoder
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 by: Cri-Cri - Sun, 28 Apr 2024 07:58 UTC

On Sat, 27 Apr 2024 17:31:29 +0200, Stefan Claas wrote:

> In this case, NOM = 851 and DENOM = 500, which means that the length of
> the output is about 85.1% of the length of the input when the input is
> being encoded, and about 58.8%
> of the length of the input when the input is being decoded.

Yeah, magic numbers. I don't like the concept of "about" here, since there
is nothing "about" about it. ;)

I suspect the concept of "about" is what is wrong with the implementation,
since it isn't the same as what you got with your code. Or both are flawed
and it should be something different altogether.

Why didn't you ask your friend to write the encoder/decoder for you from
scratch?

If you used this approach with your Rust code, you should be able to use
the same description to get it in whatever language you wanted.

--
Cri-Cri

Re: base26 Encoder/Decoder

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From: pollux@tilde.club (Stefan Claas)
Newsgroups: sci.crypt
Subject: Re: base26 Encoder/Decoder
Date: Sun, 28 Apr 2024 10:12:49 +0200
Organization: i2pn2 (i2pn.org)
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Finger: tilde.club/~pollux/
 by: Stefan Claas - Sun, 28 Apr 2024 08:12 UTC

Cri-Cri wrote:

> On Sat, 27 Apr 2024 17:31:29 +0200, Stefan Claas wrote:
>
> > In this case, NOM = 851 and DENOM = 500, which means that the length of
> > the output is about 85.1% of the length of the input when the input is
> > being encoded, and about 58.8%
> > of the length of the input when the input is being decoded.
>
> Yeah, magic numbers. I don't like the concept of "about" here, since there
> is nothing "about" about it. ;)
>
> I suspect the concept of "about" is what is wrong with the implementation,
> since it isn't the same as what you got with your code. Or both are flawed
> and it should be something different altogether.
>
> Why didn't you ask your friend to write the encoder/decoder for you from
> scratch?
>
> If you used this approach with your Rust code, you should be able to use
> the same description to get it in whatever language you wanted.
>

My Rust version works 100% the same as the Python3 implementation from the PyPI
site and I needed an encoder/decoder that works with letters and not with digits,
like the French site does.

So, in the end people are free to choose which base26 approach they like to use,
because there is no standard, like an RFC, available.

If you use other base n encoders you will see, like in base64, base32, base58,
base85, base91 etc. the base n system relies always on letters (and some digits and special characters).

So I really see no problem here.

--
Regards
Stefan

Re: base26 Encoder/Decoder

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From: pollux@tilde.club (Stefan Claas)
Newsgroups: sci.crypt
Subject: Re: base26 Encoder/Decoder
Date: Sun, 28 Apr 2024 10:22:46 +0200
Organization: i2pn2 (i2pn.org)
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 by: Stefan Claas - Sun, 28 Apr 2024 08:22 UTC

Stefan Claas wrote:

> If you use other base n encoders you will see, like in base64, base32, base58,
> base85, base91 etc. the base n system relies always on letters (and some digits and special characters).

I mean base encoders/decoders and not the base n system.

--
Regards
Stefan

Re: base26 Encoder/Decoder

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From: klee@unibwm.de (Herbert Kleebauer)
Newsgroups: sci.crypt
Subject: Re: base26 Encoder/Decoder
Date: Sun, 28 Apr 2024 12:50:21 +0200
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 by: Herbert Kleebauer - Sun, 28 Apr 2024 10:50 UTC

On 28.04.2024 10:12, Stefan Claas wrote:

> So, in the end people are free to choose which base26 approach they like to use,
> because there is no standard, like an RFC, available.

But base26 doesn't make much sense. How big are the chunks of the
data input stream you encode in base26? If you encode each byte,
you need 2 digits for the byte, which is the same as base16 (hex format).
The same is true for 2 and 3 byte chunks (4 and 6 digits). Starting
with 4 byte chunks you can save one digit (7 instead of 8 for hex).
The next step is at 7 byte chunks (12 instead of 14 digits for hex).
But this is also the biggest size which you can handle with 64 bit
arithmetic. Starting with 11 byte chunks you can save 3 digits (19
instead of 22 for hex), but this already requires long number
arithmetic.

So, if you can't use base32 at least, better stay at base16 (hex format)
instead of base26. There is only a small advantage in size, but a big
disadvantage in computing time and you have to cope with padding if the
message length is not a multiple of the chunk length.

Re: base26 Encoder/Decoder

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From: pollux@tilde.club (Stefan Claas)
Newsgroups: sci.crypt
Subject: Re: base26 Encoder/Decoder
Date: Sun, 28 Apr 2024 13:32:20 +0200
Organization: i2pn2 (i2pn.org)
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 by: Stefan Claas - Sun, 28 Apr 2024 11:32 UTC

Herbert Kleebauer wrote:

> On 28.04.2024 10:12, Stefan Claas wrote:
>
> > So, in the end people are free to choose which base26 approach they like to use,
> > because there is no standard, like an RFC, available.
>
> But base26 doesn't make much sense. How big are the chunks of the
> data input stream you encode in base26? If you encode each byte,
> you need 2 digits for the byte, which is the same as base16 (hex format).
> The same is true for 2 and 3 byte chunks (4 and 6 digits). Starting
> with 4 byte chunks you can save one digit (7 instead of 8 for hex).
> The next step is at 7 byte chunks (12 instead of 14 digits for hex).
> But this is also the biggest size which you can handle with 64 bit
> arithmetic. Starting with 11 byte chunks you can save 3 digits (19
> instead of 22 for hex), but this already requires long number
> arithmetic.
>
> So, if you can't use base32 at least, better stay at base16 (hex format)
> instead of base26. There is only a small advantage in size, but a big
> disadvantage in computing time and you have to cope with padding if the
> message length is not a multiple of the chunk length.
>

Thanks for your reply, much appreciated!

Well, the reason why I like this base26 implementation is I can use it
for the Diana Cryptosystem or the Dein Star straddling checkerboard,
when using foreign languages or transmitting small binary blobs.

The second reason, I can use this also for typing in small encrypted messages
more easily, when using Format Preserving Encryption (FPE), in an old feature
phone, for sending text messages (SMS), when grouping the string as five letter
groups, to avoid typos.

Example:

$ echo -n 'Hello sci.crypt! :-)' | base16
48656c6c6f207363692e637279707421203a2d29

$ echo -n 'Hello sci.crypt! :-)' | base32
JBSWY3DPEBZWG2JOMNZHS4DUEEQDULJJ

$ echo -n 'Hello sci.crypt! :-)' | cbase32
91JPRV3F41SP6T9ECDS7JW3M44G3MB99

$ echo -n 'Hello sci.crypt! :-)' | base26 | ug -g
GNUKB WRRLQ QCISN UJYEH SKYLR PJHKG YPTEA

Hope this makes sense!

--
Regards
Stefan

Re: base26 Encoder/Decoder

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From: pollux@tilde.club (Stefan Claas)
Newsgroups: sci.crypt
Subject: Re: base26 Encoder/Decoder
Date: Sun, 28 Apr 2024 13:44:17 +0200
Organization: i2pn2 (i2pn.org)
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 by: Stefan Claas - Sun, 28 Apr 2024 11:44 UTC

Stefan Claas wrote:

> Example:
>
> $ echo -n 'Hello sci.crypt! :-)' | base16
> 48656c6c6f207363692e637279707421203a2d29
>
> $ echo -n 'Hello sci.crypt! :-)' | base32
> JBSWY3DPEBZWG2JOMNZHS4DUEEQDULJJ
>
> $ echo -n 'Hello sci.crypt! :-)' | cbase32
> 91JPRV3F41SP6T9ECDS7JW3M44G3MB99
>
> $ echo -n 'Hello sci.crypt! :-)' | base26 | ug -g
> GNUKB WRRLQ QCISN UJYEH SKYLR PJHKG YPTEA
>
> Hope this makes sense!
>

P.S I tested this yesterday also with my Telefax machine and
freely available OCR software and had no errors, with base26.

--
Regards
Stefan

Re: base26 Encoder/Decoder

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From: klee@unibwm.de (Herbert Kleebauer)
Newsgroups: sci.crypt
Subject: Re: base26 Encoder/Decoder
Date: Sun, 28 Apr 2024 14:53:19 +0200
Organization: A noiseless patient Spider
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 by: Herbert Kleebauer - Sun, 28 Apr 2024 12:53 UTC

On 28.04.2024 13:32, Stefan Claas wrote:

> $ echo -n 'Hello sci.crypt! :-)' | base16
> 48656c6c6f207363692e637279707421203a2d29

> $ echo -n 'Hello sci.crypt! :-)' | base26 | ug -g
> GNUKB WRRLQ QCISN UJYEH SKYLR PJHKG YPTEA

I still don't understand it. In this example you have
a 20 byte String: Hello sci.crypt! :-)

The base16 (hex) conversion is trivial: you take a
single byte of the input string and replace it by
2 hex characters. No padding necessary, because the
chunk length is 1 byte and so the string length is
always a multiple of the chunk length.

But how does your base26 coding work. Take you four bytes
of the input string and then convert this 32 bit number
to base26 resulting in a 7 digit base26 number? There
are 5 of this 4 byte chunks which gives a total of 35
base26 digits. But how do you handle padding if the
input string length is not a multiple of 4?

Or do you treat the complete string as a single number
0x48656c6c6f207363692e637279707421203a2d29 and convert
this 160 bit number to a single base26 number? This would
also result in a 35 digit base26 number, but would
require long number arithmetic and consume a lot of
computing power (suppose the input string is 1 MByte or
even 1 GByte). In this case you don't have a problem
with padding but with leading zeroes.

But I still don't understand the advantage over base16.
If you only can use A-Z as transferable digits, you can
use an alternative to the standard hex encoding:

0 A or Q
1 B or R
2 C or S
3 D or T
4 E or U
5 F or V
6 G or W
7 H or X
8 I or Y
9 J or Z
10 K
11 L
12 M
13 N
14 O
15 P

Because there are two ways to encode 0-9, you
can use this to send a second data stream. If
A-J is used a 0 bit transferred and if Q-Z is used
a 1 bit is transferred on this second channel. You
can use this for example for a check sum or an
error correcting code.

Re: base26 Encoder/Decoder

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From: pollux@tilde.club (Stefan Claas)
Newsgroups: sci.crypt
Subject: Re: base26 Encoder/Decoder
Date: Sun, 28 Apr 2024 15:45:19 +0200
Organization: i2pn2 (i2pn.org)
Message-ID: <v0ljtg$2g491$1@i2pn2.org>
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 by: Stefan Claas - Sun, 28 Apr 2024 13:45 UTC

Herbert Kleebauer wrote:

> But how does your base26 coding work. Take you four bytes
> of the input string and then convert this 32 bit number
> to base26 resulting in a 7 digit base26 number? There
> are 5 of this 4 byte chunks which gives a total of 35
> base26 digits. But how do you handle padding if the
> input string length is not a multiple of 4?
>
> Or do you treat the complete string as a single number
> 0x48656c6c6f207363692e637279707421203a2d29 and convert
> this 160 bit number to a single base26 number? This would
> also result in a 35 digit base26 number, but would
> require long number arithmetic and consume a lot of
> computing power (suppose the input string is 1 MByte or
> even 1 GByte). In this case you don't have a problem
> with padding but with leading zeroes.

Sorry (I get a red face ...) The Rust code is derived
from the Python3 library without thinking to much about
the logic behind it, so I can't answer your questions
correctly!

For me it was sufficient that the code works, as expected
for small payloads, when comparing the output with the
Python3 library. The program is not intended for encoding
large (binary) payloads and only meant as a helper program
for the Diana Cryptosystem or Dein Star etc.

I am no programmer like you guys are but always appreciate
the comments! And I was in need for a binary program solution,
instead of using Python scripts, which I do not like.

> But I still don't understand the advantage over base16.
> If you only can use A-Z as transferable digits, you can
> use an alternative to the standard hex encoding:
>
> 0 A or Q
> 1 B or R
> 2 C or S
> 3 D or T
> 4 E or U
> 5 F or V
> 6 G or W
> 7 H or X
> 8 I or Y
> 9 J or Z
> 10 K
> 11 L
> 12 M
> 13 N
> 14 O
> 15 P
>
> Because there are two ways to encode 0-9, you
> can use this to send a second data stream. If
> A-J is used a 0 bit transferred and if Q-Z is used
> a 1 bit is transferred on this second channel. You
> can use this for example for a check sum or an
> error correcting code.

Thank you for explaining!

--
Regards
Stefan

Re: base26 Encoder/Decoder

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From: pollux@tilde.club (Stefan Claas)
Newsgroups: sci.crypt
Subject: Re: base26 Encoder/Decoder
Date: Sun, 28 Apr 2024 16:56:08 +0200
Organization: i2pn2 (i2pn.org)
Message-ID: <v0lo29$2gbvu$1@i2pn2.org>
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<g74JN.751237$mUo.609280@fx08.ams4>
<v0dtc5$276id$1@i2pn2.org>
<v0dup1$276id$2@i2pn2.org>
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 by: Stefan Claas - Sun, 28 Apr 2024 14:56 UTC

Herbert Kleebauer wrote:

> If you only can use A-Z as transferable digits, you can
> use an alternative to the standard hex encoding:
>
> 0 A or Q
> 1 B or R
> 2 C or S
> 3 D or T
> 4 E or U
> 5 F or V
> 6 G or W
> 7 H or X
> 8 I or Y
> 9 J or Z
> 10 K
> 11 L
> 12 M
> 13 N
> 14 O
> 15 P
>
> Because there are two ways to encode 0-9, you
> can use this to send a second data stream. If
> A-J is used a 0 bit transferred and if Q-Z is used
> a 1 bit is transferred on this second channel. You
> can use this for example for a check sum or an
> error correcting code.

Would this be the correct output for A-Z encoding?

$ echo -n 'sci.crypt is cool! :-)' | ./az
XDGTWJCOWDHSXJHQXECQWJHTSAGTWPGPWMCRSADKSNCZ

$ echo -n 'sci.crypt is cool! :-)' | base16
7363692e637279707420697320636f6f6c21203a2d29

--
Regards
Stefan

Re: base26 Encoder/Decoder

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From: pollux@tilde.club (Stefan Claas)
Newsgroups: sci.crypt
Subject: Re: base26 Encoder/Decoder
Date: Mon, 29 Apr 2024 19:42:50 +0200
Organization: i2pn2 (i2pn.org)
Message-ID: <v0om6r$2juq5$1@i2pn2.org>
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 by: Stefan Claas - Mon, 29 Apr 2024 17:42 UTC

Stefan Claas wrote:

> Herbert Kleebauer wrote:
>
> > If you only can use A-Z as transferable digits, you can
> > use an alternative to the standard hex encoding:
> >
> > 0 A or Q
> > 1 B or R
> > 2 C or S
> > 3 D or T
> > 4 E or U
> > 5 F or V
> > 6 G or W
> > 7 H or X
> > 8 I or Y
> > 9 J or Z
> > 10 K
> > 11 L
> > 12 M
> > 13 N
> > 14 O
> > 15 P
> >
> > Because there are two ways to encode 0-9, you
> > can use this to send a second data stream. If
> > A-J is used a 0 bit transferred and if Q-Z is used
> > a 1 bit is transferred on this second channel. You
> > can use this for example for a check sum or an
> > error correcting code.
>
> Would this be the correct output for A-Z encoding?
>
> $ echo -n 'sci.crypt is cool! :-)' | ./az
> XDGTWJCOWDHSXJHQXECQWJHTSAGTWPGPWMCRSADKSNCZ
>
> $ echo -n 'sci.crypt is cool! :-)' | base16
> 7363692e637279707420697320636f6f6c21203a2d29

I would say yes, because the table matches the hex
values and the encoder/decoder is also fast enough
to handle 1 GB of data, for example.

Well, a new tool to play with, thanks to Herbert's
suggestion. :-)

--
Regards
Stefan

Re: az - Telefax/OCR Test (was: base26 Encoder/Decoder)

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From: pollux@tilde.club (Stefan Claas)
Newsgroups: sci.crypt
Subject: Re: az - Telefax/OCR Test (was: base26 Encoder/Decoder)
Date: Tue, 30 Apr 2024 16:43:42 +0200
Organization: i2pn2 (i2pn.org)
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 by: Stefan Claas - Tue, 30 Apr 2024 14:43 UTC

Stefan Claas wrote:
> Well, a new tool to play with, thanks to Herbert's
> suggestion. :-)

Ok. I created 1000 random bytes with OpenSSL, converted
them with az, with a line length of 50 characters set.

Then the file was opened in LibreOffice, with the settings
of 16 pt, Liberation Mono font and saved as .pdf. With
these settings, 2000 characters fit exactly in an A4 page.

To send a Telefax to my Fax machine I used an online
service, where I have a paid account.

Once the Fax was received I scanned it with 200 dpi and
saved it as .png. For OCR translation I used Boxsoft Free
OCR, for Windows, because Tesseract gave me more errors
in the past. I only had one error in one line, which showed
at the beginning a dot and space, which I removed manually.

Again I used az to decode the file and a diff showed no
differences in the binaries.

Here is a URL with the files, in case someone likes to look
at them:

<https://1drv.ms/f/s!Agn0bI_1Rm5ehnT1oJLYw5HafvGB?e=R6i09c>

--
Regards
Stefan

Re: az - Telefax/OCR Test

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From: klee@unibwm.de (Herbert Kleebauer)
Newsgroups: sci.crypt
Subject: Re: az - Telefax/OCR Test
Date: Tue, 30 Apr 2024 21:24:54 +0200
Organization: A noiseless patient Spider
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 by: Herbert Kleebauer - Tue, 30 Apr 2024 19:24 UTC

On 30.04.2024 16:43, Stefan Claas wrote:

> Ok. I created 1000 random bytes with OpenSSL, converted
> them with az, with a line length of 50 characters set.
>
> Then the file was opened in LibreOffice, with the settings
> of 16 pt, Liberation Mono font and saved as .pdf. With
> these settings, 2000 characters fit exactly in an A4 page.

But QR code exists since a long time. This is also
a pdf with one A4 page, but if you decode it, you get
a 10 kByte jpg, which is 10x the amount of data of your
text page.

http://onlib.de/temp/demo.pdf

And if you have more data to transfer, use a QR code
video, for example:

http://onlib.de/temp/qr.mp4

You can upload your video to youtube, so anybody can
download and decode it.

If you decode the QR code video, you will get a zip file
with some pictures. The password for the pictures is:
"The quick brown fox jump"

And if you want to encrypt or hide the video, take a
look at:

http://onlib.de/pub/pfv/

For example, the video:

http://onlib.de/pub/pfv/demo.mp4

has one unencrypted video (so you can just click the
above link and watch the unencrypted video) and two
encrypted videos and one zip file which you can only
access if you download the file and enter the correct
password.

Re: az - Telefax/OCR Test

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From: pollux@tilde.club (Stefan Claas)
Newsgroups: sci.crypt
Subject: Re: az - Telefax/OCR Test
Date: Wed, 1 May 2024 10:29:26 +0200
Organization: i2pn2 (i2pn.org)
Message-ID: <v0suh6$2opr6$1@i2pn2.org>
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Finger: tilde.club/~pollux/
X-Spam-Checker-Version: SpamAssassin 4.0.0
 by: Stefan Claas - Wed, 1 May 2024 08:29 UTC

Herbert Kleebauer wrote:

> On 30.04.2024 16:43, Stefan Claas wrote:
>
> > Ok. I created 1000 random bytes with OpenSSL, converted
> > them with az, with a line length of 50 characters set.
> >
> > Then the file was opened in LibreOffice, with the settings
> > of 16 pt, Liberation Mono font and saved as .pdf. With
> > these settings, 2000 characters fit exactly in an A4 page.
>
> But QR code exists since a long time. This is also
> a pdf with one A4 page, but if you decode it, you get
> a 10 kByte jpg, which is 10x the amount of data of your
> text page.
>
> http://onlib.de/temp/demo.pdf
>
> And if you have more data to transfer, use a QR code
> video, for example:
>
> http://onlib.de/temp/qr.mp4
>
> You can upload your video to youtube, so anybody can
> download and decode it.
>
> If you decode the QR code video, you will get a zip file
> with some pictures. The password for the pictures is:
> "The quick brown fox jump"
>

I decoded the image and had one error in the certutil file
(one byte missing in one line at the end). The video was
also a certutil file, but with to many errors, so it wrote
a bad .mp4, which I could not decode.

How did you manage to precisely insert 12 QR-Codes nicely on
an A4 page?

--
Regards
Stefan

devel / sci.crypt / Re: base26 Encoder/Decoder

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