Symmetric encryption

[Per Tunedal Casual]

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At 23:20 2004-10-24, Per Tunedal Casual wrote:
 >
 >What are the security implications? It cannot be meaningful to choose a
 >cipher that produces a longer key than the password can generate. If SHA-1
 >is the limit, then you've got 160 bits. Thus a cipher with 256 bits would
 >be overkill. If the password is used directly the calculation must be based
 >on the strength of the password used by the individual, I suppose.
 >
 >Vänligen
 >Per Tunedal

I thought once more about this :-)
It's hard enough to put up a passphrase that matches an 128 bit-key. The
hash, if any, doesn't matter, because it can hardly decrease the strength
of the passphrase,.

Thus any cipher with a key longer than 128-bits is overkill when you
encrypt symmetrically. Right?

Per Tunedal

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