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From: Stefan Claas <pollux@tilde.club>
Newsgroups: sci.crypt
Subject: Re: Inspired by Chris's HMAC cipher
Date: Thu, 17 Oct 2024 20:25:09 -0000
Organization: Ch1ffr3punk5
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Chris M. Thomasson wrote:
> On 10/17/2024 12:25 PM, Stefan Claas wrote:
> > Stefan Claas wrote:
> > > Stefan Claas wrote:
> > > > Chris M. Thomasson wrote:
> > > > > On 9/20/2024 4:17 AM, Stefan Claas wrote:
> > > > > > I came up with the following idea.
> > > > > > 
> > > > > > Register a webpage at nekoweb.org, use an API key
> > > > > > and send encrypted messages to the web page, which
> > > > > > later Bob and Alice can decrypt.[...]
> > > > > 
> > > > > To decrypt use the default key, except click on the SHA512 radio button,
> > > > > then click decrypt:
> > > > > 
> > > > > http://fractallife247.com/test/hmac_cipher/ver_0_0_0_1?ct_hmac_cipher=a4f7cb5f3c7a0957d9517ad740b06a5d13a02e0affcb2882f700e388eec93f650c92e3b451915f04d2c0dd45f13e1ad5bfad03552937e2ff2602ec88dc3ccdce8b3076ec0addad4b41123297542709c292bb836850057363dbd2e7c7eb6f237db3e3d3d891600c880b92bbbe0b293a34bbc4994c81dba3deef421247965b01ef1cfca2ac91fc73b1511997cb09907e
> > > > 
> > > > Hi Chris, please reply here in plaintext. I do not have the passwort anymore.
> > > 
> > > Or for further communications, I would prefer that you use my minicrypt too,
> > > because then we do not need to visit the WWW, for encrypted communications.
> > > 
> > > My pub key (save it as stefan.pem):
> > > 
> > > -----BEGIN PUBLIC KEY-----
> > > tRxoeAmoI+0ygSbUYHBRpbYBDkC9+Q3rSTchzSXFHrU=
> > > -----END PUBLIC KEY-----
> > > 
> > > https://github.com/706f6c6c7578/minicrypt
> > 
> > Your ciphertext is also longer than minicrypt ciphertext.
> > 
> > Your message with your HMAC cipher:
> > 
> > a4f7cb5f3c7a0957d9517ad740b06a5d13a02e0affcb2882f700e388eec93f65
> > 0c92e3b451915f04d2c0dd45f13e1ad5bfad03552937e2ff2602ec88dc3ccdce
> > 8b3076ec0addad4b41123297542709c292bb836850057363dbd2e7c7eb6f237d
> > b3e3d3d891600c880b92bbbe0b293a34bbc4994c81dba3deef421247965b01ef
> > 1cfca2ac91fc73b1511997cb09907e
> > 
> > Your message with my minicrypt cipher:
> > 
> > RzJ1JQ9XcXuvqozXkVDzTMOLVwOcZTboSrj+16/gZmU+l/0wrLy1Lj6tu+o24QHJ
> > Oo7OZ2XXhbf6PqdQ4mpGxDOB7QuasdrnKwPLUNrnUPgXgimjl/3f1HRcJz6pBQf2
> > Ywgh1TCpiZnydd+Clt8uj4dbXHYpSSBkG0NIchAauixcHzXAPlME233RW8VrddMi
> > tAYbJptlqHLB
> > 
> 
> Yeah, I am only representing the ciphertext in hex right now for the
> online version. Now, I could modify it to encode the ciphetext in base
> 64 or something a little more "dense", so to speak... Fwiw, here is a
> link to a C based test version, have you seen it yet?
> 
> https://groups.google.com/g/comp.lang.c/c/a53VxN8cwkY/m/XKl1-0a8DAAJ
> 
> ;^)

Yes, I remember that and I had compiler errors.

Have you tried my minincrypt yet? It is probably the easiest to
use public key encryption software. ;-)

-- 
Regards
Stefan