Cryptanalysis of multiple modes of operation
- Eli Biham
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In recent years, several new attacks on DES were introduced. These attacks have led researchers to suggest stronger replacements for DES, and in particular new modes of operation for DES. The most popular new modes are triple DES variants, which are claimed to be as secure as triple DES. To speed up hardware implementations of these modes, and to increase the avalanche, many suggestions apply several standard modes sequentially. In this paper we study these multiple (cascade) modes of operation. This study shows that many multiple modes are much weaker than multiple DES, and their strength is comparable to a single DES.
We conjecture that operation modes should be designed around an underlying cryptosystem without any attempt to use intermediate data as feedback, or to mix the feedback into an intermediate round. Thus, in particular, triple DES used in CBC mode is more secure than three single DES's used in triple CBC mode. Alternatively, if several encryptions are applied to each block, the best choice is to concatenate them to one long encryption, and build the mode of operation around it.
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- Cryptanalysis of multiple modes of operation
- Book Title
- Advances in Cryptology — ASIACRYPT'94
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- 4th International Conferences on the Theory and Applications of Cryptology Wollongong, Australia, November 28 – December 1, 1994 Proceedings
- pp 278-292
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- Lecture Notes in Computer Science
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- Springer Berlin Heidelberg
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