Re: best cipher for SSH2

"Melloe Yelloe" <anon@xxxxxxxxxxxxxxx> wrote in message
news:5AFCL04838935.7901851852@xxxxxxxxxxxxxxxxxx
Thanks to everyone for their insight. All things being equal,
wouldn't the same cipher with a 256 bit key be stronger than a
128 bit key (i.e. Twofish256 vs. Twofish128, or AES256 vs. AES
128)? Thanks.

With the notable exception of contrived circumstances, and situations that
are so far beyond useful as to be ignorable, a larger key is safer. In some
cases there is a small speed disadvantage, but the difference is generally
irrelevant.

The truth is that 128-bits of security requires about 10^21 years of
4GOps/sec processing, so it would take many billions of billions of custom
built systems just to perform a single break in a human lifetime. It is only
if you find a need to protect yourself from Quantum Computation that going
beyond 128-bits should be considered necessary.

Generally speaking 256-bits is unnecessary but can give a warm-fuzzy feeling
which can be of personal value.
Joe


.

Relevant Pages

  • Re: best cipher for SSH2
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    ... >stronger or weaker if we can't quantify strength? ... tests on knowledge cipher A is much stronger than cipher B yet ... My Crypto code ...
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    ... and the resulting combination might be not much stronger ... > ciphertext with a bad cipher. ... would this third cipher be: ... stronger than the weaker but weaker than the stronger ...
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