CAST key size
Peter Gutmann
pgut001 at cs.auckland.ac.nz
Mon Aug 25 04:41:57 PDT 1997
>Just a quick question on the keysize of the CAST algorithm. According to
>the bible of Bruce, CAST uses a 64 bit keysize, while in the manual of
>PGP 5.0 (page 89), Phill states that CAST uses a 128 bit keysize...
>
>Am I missing something?
"CAST" isn't a particular algorithm, but a design process for creating
algorithms. The particular CAST instantiation used in PGP 5 is either
CAST-128 or CAST5, depending on who you ask. Other versions of CAST abound,
including an earlier one used by MS for unknown purposes which had a 64-bit
key, probably the one Bruce is referring to.
Peter.
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