As for SHA512 being under threat? That is simply ludicrous.
As a quick Fermi estimate --
Brute-forcing a preimage collision in SHA-512 takes 10**153 operations
(2**511).
Each attempt requires erasing 1024 bits of information (512 bits of
input buffer and 512 of output buffer). That's 10**3, more or less.
Each erasure of a bit requires 10**-23 joules of energy.
Multiply 'em together and you get 10**133 joules of energy. Then
apply E=mc**2, which tells us each kilogram is equivalent to 10**17
joules, and you discover that the attempt at brute-forcing SHA-512
will distort space-time as much as a mass of 10**116 kg.
The universe has a mass of 10**53 kg.
If anyone is intent on brute-forcing SHA-512 in our universe, I'm
going to have to insist that they shift their operations to the
nearest convenient parallel dimension. I do not want this going on in
the same light-cone of where I live.
_______________________________________________
enigmail-users mailing list
[email protected]
To unsubscribe or make changes to your subscription click here:
https://admin.hostpoint.ch/mailman/listinfo/enigmail-users_enigmail.net
