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From: Stefan Claas <stefan@mailchuck.com>
Newsgroups: sci.crypt
Subject: Re: AI's take on my cipher...
Date: Fri, 11 Jul 2025 16:56:14 +0200
Organization: i2pn2 (i2pn.org)
Message-ID: <95a6f265f6bdddcd037a7e48cf5258e77cec9b15@i2pn2.org>
References: <1049c0q$10d0c$1@dont-email.me> <8d7c7d9307d4b388e11acbd6cc67497bef8a93a9@i2pn2.org> <104esqo$2fdr8$1@dont-email.me> <3e611d6e6188f4a2e1083eb67ae59cb515b78122@i2pn2.org> <104h80t$33194$1@dont-email.me> <621d76ebcef1c8f78f02a5fa9e1c27ae0fbfed8b@i2pn2.org> <104heam$342nj$1@dont-email.me> <eeff339dfe088d5d222d32f5cf5c5b5c784bb293@i2pn2.org> <104heub$342nj$2@dont-email.me> <104hf6g$342nj$3@dont-email.me> <113fc5170ae257be53e3dfce3e09a1d8a656845d@i2pn2.org> <104hg48$34e4t$1@dont-email.me> <73ca1dbdd8b34b76e75ff709f86d5382de94a708@i2pn2.org> <104hho4$34e4t$3@dont-email.me> <51f3d09a4bd7363784d3b51bf79bfd1677230f12@i2pn2.org> <104hp5s$363bm$1@dont-email.me> <e80d25a08cb77a726c77b8359c59833f871cfa1e@i2pn2.org> <104mgv5$cvfq$1@dont-email.me> <047c88f47daa342fbbf7aee669a3deb8896ce6af@i2pn2.org> <104mj60$dltj$1@dont-email.me> <4b6e233e7c3fb669fa324151f627c4addbfc9f70@i2pn2.org> <104r7eo$1i08p$1@dont-email.me>
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 0e2df585100e6468f5032ebf6ad1c2e3a1e55a35f41c4e0a114fe3d9d03cb309

Richard Heathfield wrote:
> On 10/07/2025 18:19, Stefan Claas wrote:
> > Chris M. Thomasson wrote:
> > > On 7/9/2025 12:53 PM, Stefan Claas wrote:
> > 
> > > > How does it work if A encrypts on local host and B should decrypt on his
> > > > local host, with that given link from A
> > > 
> > > Wrt the online version:
> > > 
> > > A needs to send/give B the ciphertext somehow, email, snail mail,
> > > somehow, hand signals, ect... ;^) Then B, assuming that A and B have the
> > > same secret key, can use said ciphertext to decrypt it. So, if you
> > > notice the online program has a ciphertext only, without a link prefix.
> > > Say this example: I am encrypting the message on my local host using the
> > > default key:
> > 
> > But how, for example, would you give me the secret key, from the USA to
> > Germany, without meeting in person?
> 
> Diffie-Hellman can establish a secret key in public. Then authenticate
> over an encrypted channel.

I know, but how do you protect the key on your online device against
Pegasus or FinSpy? For proper encryption two parties have to do it
offline, but GnuPG users could never learn it, because it was never
explained to them.

Regards
Stefan