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An encryption algorithm is good if and only if an "enemy" can not
recover any information about the original message from the encrypted
one, unless he has the key.


Raul, it sounds like you've swallowed the "marketing" - hook, line, and
sinker. I'm in favor of key-based algorithms, but keys can be compromised
in a number of ways.


Knowing everything about the algorithm must not be of any help to
recover the original message or the key.


On the contrary, knowing how an algorithm is modified by a key provides
clues about keys.


A secret "algorithm" is not completely secret, unless you kill the
author. :-)


Keys are not completely secret either. The question is whether you want
multiple layers of defense, or not. A secret algorithm is an additional
layer of defense.

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