On Wed, 27 Aug 2008, Eric Rescorla wrote:

At Wed, 27 Aug 2008 16:10:51 -0400 (EDT), Jonathan Katz wrote:On Wed, 27 Aug 2008, Eric Rescorla wrote:At Wed, 27 Aug 2008 17:05:44 +0200, There are a set of techniques that allow you to encrypt elements of arbitrary sets back onto that set. The original paper on this is: John Black and Phillip Rogaway. Ciphers with arbitrary ?nite domains. In CT-RSA, pages 114?130, 2002.But he probably wants an encryption scheme, not a cipher.Hmm... I'm not sure I recognize the difference between encryption scheme and cipher. Can you elaborate?

`A block cipher is a primitive that can be used, in particular, to`

`construct encryption schemes. But you can construct encryption schemes`

`without block ciphers, and you can use block ciphers to construct other`

`things besides encryption. Moreover, "good" encryption should generally`

`be randomized, while a block cipher is deterministic.`

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