2002 | OriginalPaper | Buchkapitel
Tweakable Block Ciphers
verfasst von : Moses Liskov, Ronald L. Rivest, David Wagner
Erschienen in: Advances in Cryptology — CRYPTO 2002
Verlag: Springer Berlin Heidelberg
Enthalten in: Professional Book Archive
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We propose a new cryptographic primitive, the “tweakable block cipher.” Such a cipher has not only the usual inputs — message and cryptographic key — but also a third input, the “tweak.” The tweak serves much the same purpose that an initialization vector does for CBC mode or that a nonce does for OCB mode. Our proposal thus brings this feature down to the primitive block-cipher level, instead of incorporating it only at the higher modes-of-operation levels. We suggest that (1) tweakable block ciphers are easy to design, (2) the extra cost of making a block cipher “tweakable” is small, and (3) it is easier to design and prove modes of operation based on tweakable block ciphers.