The symmetric ciphers

[Philipp Klaus Krause]

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Am 30.10.2013 23:51, schrieb Bob (Robert) Cavanaugh:
> I guess I lost track of the initial purpose of this thread. Why do 
> you want this if you can only achieve the same cryptographic
> strength as one of the ciphers? What problem are you solving?

There are multiple symmetric ciphers. Any one of them might already
have been broken by an adversary, but I assume that there are many
among them that are not broken. I do not know which ones are which.

So, if I have ciphers A, B and C, and a way to combine them into one
symmetric cpher that is at least as strong as the strongest among
them, I could use this combined cipher for somewhat secure
communication as long as at least one of A, B, C is not broken, even
if I do not know which ones are broken.

Philipp
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