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Title: Plaintext Recovery in DES-like Cryptosystems Based on S-boxes with Embedded Parity Check
Authors: Angelova, Vesela
Borissov, Yuri
Keywords: DES-like cryptosystem
affine subspace
plaintext recovery
backtracking search
language model
Issue Date: 2013
Publisher: Institute of Mathematics and Informatics Bulgarian Academy of Sciences
Citation: Serdica Journal of Computing, Vol. 7, No 3, (2013), 257p-270p
Abstract: We describe an approach for recovering the plaintext in block ciphers having a design structure similar to the Data Encryption Standard but with improperly constructed S-boxes. The experiments with a backtracking search algorithm performing this kind of attack against modified DES/Triple-DES in ECB mode show that the unknown plaintext can be recovered with a small amount of uncertainty and this algorithm is highly efficient both in time and memory costs for plaintext sources with relatively low entropy. Our investigations demonstrate once again that modifications resulting to S-boxes which still satisfy some design criteria may lead to very weak ciphers. ACM Computing Classification System (1998): E.3, I.2.7, I.2.8.
ISSN: 1312-6555
Appears in Collections:Volume 7 Number 3

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