cypher algorithm - which one?
David Picón Álvarez
eleuteri@myrealbox.com
Sat Nov 2 17:33:01 2002
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Hi,
> It's a difficult question, because it's sort of an apples-and-oranges
> comparison. It really depends on what you are using the key for. a
> 1024bit DSA signing key is generally felt to be more or less as secure
> as the 160-bit hash that it uses. If you make a bigger DSA (and this
> is technically possible, though GnuPG and PGP follow the spec and stop
> after 1024), you still have that 160-bit hash as your weak point.
Assuming a hash is well-defined and so on, isn't it roughly as strong as a
symmetric cipher of the same length? If so, I've read repeatedly that a
symmetric 128 bit cipher is very likely stronger than a 2048 asymmetric one.
--David.
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