Cryptology ePrint Archive: Report 2009/297

A New Improved Distinguisher for HC-128

Subhabrata Sen and Rudradev Sengupta and Subhamoy Maitra and Goutam Paul and Shashwat Raizada

Abstract: In this paper, we present a new distinguisher for HC-128 which is the best known so far. The distinguisher requires approximately $2^{138}$ keystream words with success probability 0.9772.

Category / Keywords: secret-key cryptography / Bias, Cryptography, Distinguishing Attack, eStream, Keystream, Linear Approximation, Stream Cipher.

Date: received 19 Jun 2009, last revised 7 Jul 2009, withdrawn 4 Aug 2009

Contact author: subho at isical ac in

Available format(s): (-- withdrawn --)

Note: We found a flaw in the proof of the distinguisher and could not recover it yet. Thus the distinguisher does not stand in its present form.

Version: 20090804:072907 (All versions of this report)

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