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HCTR: A Variable-Input-Length Enciphering Mode
[chapter]
2005
Lecture Notes in Computer Science
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 ( sprp), when the underlying blockcipher is a strong pseudorandom permutation (sprp). HCTR is shown to be a very efficient mode of operation
doi:10.1007/11599548_15
fatcat:ikcy2wnctncg5n7tmxccommla4