----- Forwarded message from Peter Gutmann -----
From cpunks Mon Aug 25 08:03:32 1997 From: pgut001@cs.auckland.ac.nz (Peter Gutmann) To: hvdl@sequent.com Subject: Re: CAST key size Reply-To: pgut001@cs.auckland.ac.nz X-Charge-To: pgut001 X-Authenticated: relaymail v0.9 on cs26.cs.auckland.ac.nz Date: Mon, 25 Aug 1997 23:39:58 (NZST) Message-ID: <87250919812278@cs26.cs.auckland.ac.nz> Sender: owner-cypherpunks@toad.com Precedence: bulk
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. ----- End of forwarded message from Peter Gutmann -----