Eric Cordian [mailto:emc@wire.insync.net] writes:
So we can't use the rotate instruction with a data-dependent shift count in a block encryption algorithm without a license from Ron?
"Harvey Rook (Exchange)" <hrook@exchange.microsoft.com> writes:
It's a little bit more complicated than that. RC-6, which also uses data dependant rotations is patent free.
It's a little bit more complicated than that. RC6 will be available without licensing charges to anybody if it's tapped as the official winner of the AES bakeoff. If it's not selected, then it's my understanding that RSADSI (Security Dynamics?) may choose to require payment for licensing -- I assume based on the RC5 patent. The current understanding is that AES candidates sign over their rights only if they are selected. Several candidates have been explicitly put into the public domain in advance of the selection process; RC6 is not one of these. Please correct me if it's more complicated than <this>. -- Jim Gillogly Trewesday, 23 Blotmath S.R. 1998, 23:38 12.19.5.12.6, 11 Cimi 19 Zac, Third Lord of Night