Published January 1, 2004 | Version v1
Conference paper Open

A new meet-in-the-middle attack on the IDEA block cipher

Description

In this paper we introduce a novel meet-in-the-middle attack on the IDEA block cipher. The attack consists of a precomputation and an elimination phase. The attack reduces the number of required plaintexts significantly for 4 and 4.5 rounds, and, to the best of our knowledge, it is the first attack on the 5-round IDEA.

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