Technical Report CS0885

Title: Cryptanalysis of Triple-Modes of Operation
Authors: Eli Biham
Abstract: Multiple modes of operation, and in particular, triple-modes of operation were suggested as a simple method to improve the strength of blockciphers, and in particular of DES. The developments in the cryptanalysis of DES in the recent years have popularized the triple-modes of DES, and such modes are discussed now towards acceptance as ANSI standards.

In a previous paper we analyzed multiple modes of operation and showed that many multiple modes are much less secure than expected. In this paper we extend these results, with new cryptanalytic techniques, and show that all the triple modes of operation are theoretically not much more secure than a single encryption. We then suggest several candidates for more secure modes.

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