Just a quick RC2 update, since I have not seen anything about it's speed on this list. I have implemented RC2 from the posting from Message-ID: <4fk39f$f70@net.auckland.ac.nz> in sci.crypt (This is the 'text' description of the algorithm). The following times are from C code using gcc 2.7.0 on a sparc 20 and cc on 'some old slow alpha box' sparc 20 Alpha rc4 4521k/s 3835k/s des cbc 993k/s 833k/s des ede3 cbc 370k/s 476k/s idea cbc 862k/s 726k/s rc2 cbc 975k/s 1083k/s Documentation I had seen previously about RC2 made the claim it was about 3 times faster than DES is software. From my times it appears to be of a similar speed (depending on the box). It as has been speculated that RC2 was origionally written for effiecent implementation on 16bit hardware, this could well be true, but for modern 32bit processors, it appears to have no real speed advantage over DES or IDEA. I'm mostly interested in RC2 because it is in the SSLv2 and S-MIME specifications :-). Any comments? eric PS If RC2 was implemented in assember, it would obviously be faster due to direct use of machine rotate instructions. I don't quite know how much this would speed things up but obviously the other algorithms would also benifit from hand coding. -- Eric Young | Signature removed since it was generating AARNet: eay@mincom.oz.au | more followups than the message contents :-)