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Re: Comments/questions on library interface

jtkohl@ATHENA.MIT.EDU (jtkohl@ATHENA.MIT.EDU)
Mon Dec 4 15:09:31 1989

Date: Tue, 28 Nov 89 13:50:34 EST
From: sommerfeld@APOLLO.COM (Bill Sommerfeld)
To: jtkohl@ATHENA.MIT.EDU
In-Reply-To: John T Kohl's message of Monday, November 27, 1989   11:42:56 am (EST)
Subject: Re: comments on header files.

   > The encryption/decryption interface seems to assume a block cipher,
   > not a (blocked-)stream cipher; I think the latter might be a better
   > choice of interface.

   The problem is that assumption of a stream cipher causes some problems;
   assuming a block cipher is a more general case of a stream cipher (which
   can be considered a block cipher with blocksize 1).

Yes, but do all stream ciphers built on block ciphers use a scheme
identical to CBC to merge together blocks?  I don't think we can
depend on that.

Maybe we need "block cipher" encode/decode and "stream cipher"
encode/decode in the operations...

					- Bill



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