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Blowfish is a published algorithm written by Bruce Schneier Unlike
IDEA or DES etc. there are no patent implications in using this
algorithm.
It uses anywhere between a 64 bit and a 448 bit key. The transform
itself is fast and operates on a 64 bit block, and most of the
calculation time is in initialising the context with the key data.
The _PP name comes from the fact that this implementation is Pure
Perl, and will not have any compatibility problems.
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