FW: Rejected posting to [email protected]

>Does anyone care about 1-bit CFB mode?  How about 2 bits or 4 bits?

No ... Seems like a bad idea.
>
>Is there any valid use for CFB mode where the feedback size=20 doesn't 
>divide the block size, like 5 bits or 23 bits?

No.  If so, let someone build it as a special case.

Does anyone care about CFB at all?  It really is not necessary or
recommended for any useful purpose.
>
>What should be done about padding the final plaintext, when=20 the 
>feedback size is smaller than the block size?  Is it ok to=20 just 
>require that the total plaintext consist of an integer=20 number of 
>feedback units in those cases?

No. Padding should be fully automatic and invisible to the end-user.

>  What about the=20
>full-block case?

?

>I'm trying to think of what software applications use CFB mode=20 at 
>all. Anyone know of any?

draft-tso-telnet-enc-des-cfb-00.txt

But this is not being use.

Paul (another one :)