Hi all,

gemini://cryptobook.cities.yesterweb.org/

The above URL is a guestbook on Geminspace,
where users can leave an encrypted message.

For Linux there is elpher (emacs) or the beautiful
Lagrange client, besides others, available.

As username you may choose a hexadecimal IV, nonce, tweak
or whatever you call it and then for the message a hex
encoded string in one line.

Be the first to submit an entry and post the hex key here,
so that we can decrypt the message and let us know what
software you use.

I put later an entry in, with FPE (Format Preserving Encryption)
which should do the job well, hopefully, because I do not know
what the max. line lenght of guestbook entries are.

https://github.com/stefanclaas/ff1

Regards
Stefan
--
----Ed25519 Signature----
bf4cbfa5737b4d1e7f423f5dafa6378cf227fb3c816f4ce05796f8af171f147b
509782d992ff9926bb99d956300c4ef2fc5b38714b5f23a4017fd05027c8ef02

Stefan Claas wrote:

> I put later an entry in, with FPE (Format Preserving Encryption)
> which should do the job well, hopefully, because I do not know
> what the max. line lenght of guestbook entries are.
>
> https://github.com/stefanclaas/ff1

Ok, The cryptobook accepted the Username length of the nonce and
hex message. :-)

Here is the key:

406c7d05dc28874123461b2a1b636acc85745238137b0844bc1363e4d7c827f6

Regards
Stefan
--
----Ed25519 Signature----
ee6430db6033e954ef34410eb05aa850c7aaa3eb631bc0d13659353ce414fb3e
7445666590fa78fe2a4a197feb8b6a09ace867355cbeae04faf0e5adfe02000d