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Abstract  

In this paper we look at the security of two block ciphers which were both claimed in the published literature to be secure against differential crypt-analysis (DC). However, a more careful examination shows that none of these ciphers is very secure against... differential cryptanalysis, in particular if we consider attacks with sets of differentials. For both these ciphers we report new perfectly periodic (iterative) aggregated differential attacks which propagate with quite high probabilities. The first cipher we look at is GOST, a well-known Russian government encryption standard. The second cipher we look at is PP-1, a very recent Polish block cipher. Both ciphers were designed to withstand linear and differential cryptanalysis. Unhappily, both ciphers are shown to be much weaker than expected against advanced differential attacks. For GOST, we report better and stronger sets of differentials than the best currently known attacks presented at SAC 2000 [32] and propose the first attack ever able to distinguish 16 rounds of GOST from random permutation. For PP-1 we show that in spite of the fact, that its S-box has an optimal theoretical security level against differential cryptanalysis [17], [29], our differentials are strong enough to allow to break all the known versions of the PP-1 cipher.

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Authors: Nicolas T. Courtois, Theodosis Mourouzis, Anna Grocholewska-Czuryło and Jean-Jacques Quisquater

eprint.iacr.org/2012/401/. [2] Babenko , Lyudmila K. and Ishchukova , Evgeniya , Differential analysis of GOST encryption algorithm , in: SIN 2010 , pp. 149 – 157 , ACM

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Abstract  

In our constribution we explore a combination of local reduction with the method of syllogisms and the applications of generic guessing strategies in the cryptanalysis of the block cipher GOST. Our experiments show that GOST with 64/128/256 bit key requires at least 12/16/22 rounds to achieve full bit security against the method of syllogisms combined with the “maximum impact” strategy.

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Authors: Boris N. Kuznetsov, Svetlana A. Kuznetsova, Vladimir G. Danilov, Olga V. Yatsenkova and Andrey V. Petrov

acetic acid of “chemically pure” grade (GOST 61-75), hydrogen peroxide of medical grade (GOST 177-88), sulfuric acid of “chemically pure” grade (GOST 4204-77) and distilled water (GOST 6709-72). Delignification of wood sawdust was carried out in a

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Authors: Ivan M. Berezin, Alexandre A. Petunin, Dimtrij I. Kryuchkov and George L. Kovács

& Sorensen Inc, ABAQUS Theory Manual , Version 6.12, 2006 . [15] GOST 5520–79 , Russian Standard , Russian Standards Publisher, UDK669.14 - 413.62, - 213.6:006.354, 01

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Authors: András Makó, Hilda Hernádi, Gyöngyi Barna, Réka Balázs, Sándor Molnár, Viktória Labancz, Brigitta Tóth and Zsófia Bakacsi

. Genrich , D. A. & Bremner , J. M. , 1972 . A reevaluation of the ultrasonic vibration method of dispersing soils . Soil Sci. Soc. Amer. Proc. 36 . 944 – 947 . GOST (State Standard) 12536

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cooled with liquid nitrogen. A silver sample was prepared via the reduction of silver oxide by pure hydrogen. Silver oxide was obtained by the precipitation of silver nitrate (99.9% wt. “chemically pure” grade GOST 1277-75) by potassium hydroxide

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Authors: V. P. Korolev, O. A. Antonova, N. L. Smirnova and A. V. Kustov

. 19. Albright , PS , Gosting , HJ . Dielectric constants of the methanol–water system from 5 to 550 . J Am Chem Soc 1946 68 : 1061 – 1063 10.1021/ja01210a043 . 20

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