Identification of N Block Ciphers (Identification of N Block Ciphers)

William Augusto Rodrigues de Souza (, Luís Alfredo Vidal de Carvalho (, José Antonio Moreira Xexéo2

1Universidade Federal do Rio de Janeiro
2Faculdade Salesiana Maria Auxiliadora

This paper appears in: Revista IEEE América Latina

Publication Date: April 2011
Volume: 9,   Issue: 2 
ISSN: 1548-0992

This paper proposes a mechanism to identify n-block ciphers in ECB and CBC mode of operation, from patterns found on a set of cryptogams. This result demonstrates the existence of intrinsic properties in mathematical models of the ciphers, which create a signature in cryptograms. Based on unsupervised categorization technique, experiments are performed on a set of cryptogams which were enciphered by the finalist algorithms of AES contest: MARS, RC6, Rijndael, Serpent and Twofish (particular case of n = 5); with 128-bit key. The processes of clustering and categorization used were successful, allowing 100% of precision in ECB mode. The CBC mode reached 100% of precision in clustering, although it failed in the categorization process. Finally, the paper presents the propositions and its respective proofs which this methodology holds for any value of n.

Index Terms:
Cipher identification, Block Ciphers, Clustering.   

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