Cryptology ePrint Archive: Report 2008/513

Improved Cryptanalysis of SHAMATA-BC

Adem Atalay, Orhun Kara and Ferhat KarakoƧ

Abstract: We state the design flaws of the 1-round block cipher SHA\-MATA-BC, designed by Fleishmann and Gorski by using the building blocks of SHAMATA hash function. We fix the flaws and then show that the amended version of SHAMATA-BC is much weaker. We believe that there is no connection between security level of SHAMATA as a hash function and that of SHAMATA-BC as a block cipher.

Category / Keywords: secret-key cryptography / Hash function, SHAMATA, SHAMATA-BC, SHA-3

Date: received 4 Dec 2008

Contact author: orhun at uekae tubitak gov tr

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Version: 20081209:072541 (All versions of this report)

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