Cryptology ePrint Archive: Report 2005/219

Cryptanalysis of a 32-bit RC4-like Stream Cipher

Hongjun Wu

Abstract: Nawaz, Gupta and Gong recently proposed a 32-bit RC4-like stream cipher. In this paper, we show that the keystream generated from their stream cipher is not random. The keystream can be distinguished from random with only about 100 outputs (3200 bits) in 2 milliseconds on Intel Centrino 1.6GHz processor.

Category / Keywords: secret-key cryptography / stream cipher, cryptanalysis

Date: received 6 Jul 2005, last revised 7 Jul 2005

Contact author: wu hongjun at esat kuleuven be

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Version: 20050707:194157 (All versions of this report)

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