CRYPTO '93 Proceedings of the 13th annual international cryptology conference on Advances in cryptology
On the security of the IDEA block cipher
EUROCRYPT '93 Workshop on the theory and application of cryptographic techniques on Advances in cryptology
ICICS '02 Proceedings of the 4th International Conference on Information and Communications Security
Square-like Attacks on Reduced Rounds of IDEA
SAC '02 Revised Papers from the 9th Annual International Workshop on Selected Areas in Cryptography
Structural Cryptanalysis of SASAS
EUROCRYPT '01 Proceedings of the International Conference on the Theory and Application of Cryptographic Techniques: Advances in Cryptology
On Applying Linear Cryptanalysis to IDEA
ASIACRYPT '96 Proceedings of the International Conference on the Theory and Applications of Cryptology and Information Security: Advances in Cryptology
FSE '97 Proceedings of the 4th International Workshop on Fast Software Encryption
Miss in the Middle Attacks on IDEA and Khufu
FSE '99 Proceedings of the 6th International Workshop on Fast Software Encryption
FSE '02 Revised Papers from the 9th International Workshop on Fast Software Encryption
FSE '02 Revised Papers from the 9th International Workshop on Fast Software Encryption
The Saturation Attack - A Bait for Twofish
FSE '01 Revised Papers from the 8th International Workshop on Fast Software Encryption
EUROCRYPT'97 Proceedings of the 16th annual international conference on Theory and application of cryptographic techniques
Markov ciphers and differential cryptanalysis
EUROCRYPT'91 Proceedings of the 10th annual international conference on Theory and application of cryptographic techniques
Improved DST Cryptanalysis of IDEA
SAC'06 Proceedings of the 13th international conference on Selected areas in cryptography
New cryptanalytic results on IDEA
ASIACRYPT'06 Proceedings of the 12th international conference on Theory and Application of Cryptology and Information Security
New combined attacks on block ciphers
FSE'05 Proceedings of the 12th international conference on Fast Software Encryption
New attacks against reduced-round versions of IDEA
FSE'05 Proceedings of the 12th international conference on Fast Software Encryption
Related-Key boomerang and rectangle attacks
EUROCRYPT'05 Proceedings of the 24th annual international conference on Theory and Applications of Cryptographic Techniques
A Unified Approach to Related-Key Attacks
Fast Software Encryption
The Key-Dependent Attack on Block Ciphers
ASIACRYPT '09 Proceedings of the 15th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
CT-RSA'08 Proceedings of the 2008 The Cryptopgraphers' Track at the RSA conference on Topics in cryptology
ACNS'12 Proceedings of the 10th international conference on Applied Cryptography and Network Security
On the (in)security of IDEA in various hashing modes
FSE'12 Proceedings of the 19th international conference on Fast Software Encryption
Collisions for the WIDEA-8 compression function
CT-RSA'13 Proceedings of the 13th international conference on Topics in Cryptology
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IDEA is a 64-bit block cipher with 128-bit keys introduced by Lai and Massey in 1991. IDEA is one of the most widely used block ciphers, due to its inclusion in several cryptographic packages, such as PGP. Since its introduction in 1991, IDEA has withstood extensive cryptanalytic effort, but no attack was found on the full (8.5-round) variant of the cipher. In this paper we present the first known attack on 6-round IDEA faster than exhaustive key search. The attack exploits the weak keyschedule algorithm of IDEA, and combines Square-like techniques with linear cryptanalysis to increase the number of rounds that can be attacked. The attack is the best known attack on IDEA. We also improve previous attacks on 5-round IDEA and introduce a 5-round attack which uses only 16 known plaintexts.