[Cryptography] Solving Matt's hash problem

Nicholas Bohm nbohm at ernest.net
Tue Nov 15 05:25:07 EST 2022

On 12/11/2022 12:18, John Levine wrote:
> In Matt Levine's long article about cryptocurrencies, he describes in
> accurate detail how hashing works, and mentions in an aside that he
> cannot include the hash of the article in the article itself, you (the
> reader) figure out why.
> I know this is a preimage problem, but is there anything about making
> the hash itself part of the input that would make it harder or easier
> to solve?

I assumed that if you hashed the article and then altered it by 
including the hash, the hash would no longer be the hash of the article 
as altered to include the hash.

Did he mean something more subtle?

Nicholas Bohm

Contact and PGP key here <http://www.ernest.net/contact/>
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