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Erschienen in:
2005 | OriginalPaper | Buchkapitel
HCTR: A Variable-Input-Length Enciphering Mode
verfasst von : Peng Wang, Dengguo Feng, Wenling Wu
Erschienen in: Information Security and Cryptology
Verlag: Springer Berlin Heidelberg
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This paper proposes a blockcipher mode of operation, HCTR, which is a length-preserving encryption mode. HCTR turns an
n
-bit blockcipher into a tweakable blockcipher that supports arbitrary variable input length which is no less than
n
bits. The tweak length of HCTR is fixed and can be zero. We prove that HCTR is a strong tweakable pseudorandom permutation (
$\widetilde{sprp}$
), when the underlying blockcipher is a strong pseudorandom permutation (
sprp
). HCTR is shown to be a very efficient mode of operation when some pre-computations are taken into consideration. Arbitrary variable input length brings much flexibility in various application environments. HCTR can be used in disk sector encryption, and other length-preserving encryptions, especially for the message that is not multiple of
n
bits.