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N.: Rectangle Attacks on 49-Round SHACAL-1

By Eli Biham, Orr Dunkelman and Nathan Keller

Abstract

Abstract. SHACAL-1 is a 160-bit block cipher with variable key length of up to 512-bit key based on the hash function SHA-1. It was submitted to the NESSIE project and was accepted as a finalist for the 2nd phase of the evaluation. In this paper we present rectangle attacks on 49 rounds out of the 80 rounds of SHACAL-1. The attacks require 2 151.9 chosen plaintexts or ciphertexts and have time complexity of 2 508.5 49round SHACAL-1 encryptions. These are the best known attacks against SHACAL-1. In this paper we also identify and fix some flaws in previous attacks on SHACAL-1.

Publisher: Springer
Year: 2003
OAI identifier: oai:CiteSeerX.psu:10.1.1.352.7421
Provided by: CiteSeerX
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