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Title:
Enhanced Cryptanalysis of Substitution Cipher Chaining mode (SCC-128)
Authors: Mohamed Abo El-Fotouh, Klaus Diepold
Abstract:In this paper, we present an enhanced cryptanalysis of the Substitution Cipher Chaining mode (SCC)~\cite{scc}. In~\cite{scc_attack}, SCC-128 (SCC which uses AES with 128-bit key) was broken using 5 attacks, where the authors used an active attack model (where the attacker can force the disk encryption application to re-encrypt a sector for her), the complexity of these attacks are at most 2$^{40} cipher executions. In this paper, we enhance the main attack on SCC-128, this enhancement decrease the complexity of SCC-128 attacks to be at most 2^{14} cipher executions. We also cryptanalze SCC-128 in a less restrictive attack model, our attacks are upper bounded with 2^{40}$ cipher executions.
ePrint: https://eprint.iacr.org/2009/201
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