The symmetric ciphers

[Philipp Klaus Krause]

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I wonder if it would be a good idea to have an option to combine
symmetric ciphers, e.g. users could state a preference list like this:

TWOFISH+AES256 3DES+BLOWFISH+AES AES 3DES

The meaning of A+B would be to encrypt using A first, and then encrypt
the result using B with a different key. Assuming it takes effort a to
break cipher A and effort b to break cipher b, this should result in
effort at least max(a, b) needed to break A+B. And with uncertainity
about possible weaknesses in individual ciphers, this seems like a
reasonable measure to me.

Philipp
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