[Cryptography] SHA-256 decrypted (8 rounds)

[Ron Garret]

> On Apr 7, 2024, at 11:55 PM, Michael Kjörling <9bf3a7ef93bb at ewoof.net> wrote:
> 
> On 6 Apr 2024 09:12 -0700, from ron at flownet.com (Ron Garret):
>> Because they don't have a sha256 hash of
>> deb360ae3c1ff7a29f83731b33dcd4bf354a5e80de2dc50370ebf55a14216b85.
>> At best they produce that value after a limited number of rounds (i
>> didn't actually check) but that is not the challenge.
> 
> That is also not consistent with a reasonable interpretation of one
> claim that was made by McDair, who specifically stated that "when
> expanded to the full 64 rounds, the method finds 'a' valid input
> message". (See McDair's post dated 7 Jan 2024 12:06 UTC, message-ID
> <O8Ulq67s866xgJJK6QUAU7y2eWHuDq8ySZ2x3wF-IUKW4SuyH3Nv9IocvszpX5Av2x6zy5ulnk8u01cI27ZktiNjaiF0bL5Aeq0UL3flbEU=@protonmail.com>
> archived at <https://www.metzdowd.com/pipermail/cryptography/2024-January/038287.html>.)

Yeah, I was trying to be charitable.

>> (BTW, it is easily seen that McDair's examples are almost certainly
>> not fulfillments of Ray's challenge simpy because he gives more than
>> one example.  If all of those examples were in fact fulfillments of
>> Ray's challenge then not only would he have found a sha256 preimage,
>> he would have found a *collision*, and that would be Big News.)
> 
> Editorial comment: the challenge was issued by me; not by Ray
> Dillinger as McDair indicated in the post dated 28 March 2024 10:42 UTC,
> message-ID <CC2D-QBePuVd2YiNOC9TgkVgCWSkBEBDR1D1mfd48GoLMFP48j7S2py5fmL7txf9pYcBMXknZDuhXQrD-KD-4r7klXr0sU--IWP9ThHvjY4=@protonmail.com>,
> archived at <https://www.metzdowd.com/pipermail/cryptography/2024-March/038315.html>.
> 
> The challenge was issued in my post dated 8 Jan 2024 15:03 UTC,
> message-ID <2d6288d9-106b-4b91-8289-5309c9c06d95 at home.arpa>, archived at
> <https://www.metzdowd.com/pipermail/cryptography/2024-January/038288.html>.

My apologies for the misattribution.  I was going off of McDair's attribution:

> The challenge as presented by Mr. Dillinger is as follows:


But I guess I should have realized that trusting anything McDair says is probably a mistake.

On which note...

> On Apr 8, 2024, at 7:17 AM, McDair via cryptography <cryptography at metzdowd.com> wrote:
> 
> Are you sure I'm a 'he'?


I am now.

rg

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