1997 · 12 citations · 0 references
ComputingComputer ScienceAlgorithmsComputer SecurityCryptographyCryptographic AlgorithmsCryptographic ComplexityData SecurityAdvanced Encryption StandardCryptanalysisCryptographic ReductionsEncryptionEncryption AlgorithmsLinearization AttacksSecret Key Generation
In 1991 Lai, Massey and Murphy introduced the IPES (Im- proved Proposed Encryption Standard), later renamed IDEA (Interna- tional Data Encryption Algorithm). In this paper we give two new at- tacks on a reduced number of rounds of IDEA. A truncated difierential attack on IDEA reduced to 3.5 rounds and a difierential-linear attack on IDEA reduced to 3 rounds. The truncated difierential attack contains a novel method for determining the secret key.