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Erschienen in:
2011 | OriginalPaper | Buchkapitel
The Software Performance of Authenticated-Encryption Modes
verfasst von : Ted Krovetz, Phillip Rogaway
Erschienen in: Fast Software Encryption
Verlag: Springer Berlin Heidelberg
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We study software performance of authenticated-encryption modes CCM, GCM, and OCB. Across a variety of platforms, we find OCB to be substantially faster than either alternative. For example, on an Intel i5 (“Clarkdale”) processor, good implementations of CCM, GCM, and OCB encrypt at around 4.2 cpb, 3.7 cpb, and 1.5 cpb, while CTR mode requires about 1.3 cpb. Still we find room for algorithmic improvements to OCB, showing how to trim one blockcipher call (most of the time, assuming a counter-based nonce) and reduce latency. Our findings contrast with those of McGrew and Viega (2004), who claimed similar performance for GCM and OCB.