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Currently, if Mixmaster is encrypting mail to multiple recipients, it does not honor key preferences, and defaults to 3DES with no MDC. It should choose the "most prefered" settings between the recipients, only using 3DES/MDC if no other choice is available. (We'll have to make some reasonable tie-breaking decisions, too -- for instance, if one key lists AES,CAST and another lists CAST,AES -- which do we take? I think we should have an internal "preference order" that is used in these cases. I propose AES128,AES256,AES192,CAST5,3DES,IDEA,BLOW). We'll want to use the MDC feature in all possible cases. Fixing this is most important -- I'd be okay with using 3DES whenever we have multiple recipients, as long as we could use MDC if they each advertised either support for it in the features flag, or support for ciphers 7,8,9, or 10 (even though we don't support 10). Hmm. Something else to check -- PGP 7.x can decrypt MDC when used with 3DES, right?
Added a few more TODO items.
Reacquainted the TODO list with reality.
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