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Erschienen in:
2009 | OriginalPaper | Buchkapitel
HBS: A Single-Key Mode of Operation for Deterministic Authenticated Encryption
verfasst von : Tetsu Iwata, Kan Yasuda
Erschienen in: Fast Software Encryption
Verlag: Springer Berlin Heidelberg
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We propose the HBS (Hash Block Stealing) mode of operation. This is
the first
single-key mode that provably achieves the goal of providing deterministic authenticated encryption. The authentication part of HBS utilizes a newly-developed, vector-input polynomial hash function. The encryption part uses a blockcipher-based, counter-like mode. These two parts are combined in such a way as the numbers of finite-field multiplications and blockcipher calls are minimized. Specifically, for a header of
h
blocks and a message of
m
blocks, the HBS algorithm requires just
h
+
m
+ 2 multiplications in the finite field and
m
+ 2 calls to the blockcipher. Although the HBS algorithm is fairly simple, its security proof is rather complicated.