A proposal for a new block encryption standard
EUROCRYPT '90 Proceedings of the workshop on the theory and application of cryptographic techniques 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
Structural Cryptanalysis of SASAS
EUROCRYPT '01 Proceedings of the International Conference on the Theory and Application of Cryptographic Techniques: 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
Saturation Attacks on Reduced Round Skipjack
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
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
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 multiset attacks on rijndael with large blocks
Mycrypt'05 Proceedings of the 1st international conference on Progress in Cryptology in Malaysia
New attacks against reduced-round versions of IDEA
FSE'05 Proceedings of the 12th international conference on Fast Software Encryption
Faster variants of the MESH block ciphers
INDOCRYPT'04 Proceedings of the 5th international conference on Cryptology in India
Narrow-Bicliques: cryptanalysis of full IDEA
EUROCRYPT'12 Proceedings of the 31st Annual international conference on Theory and Applications of Cryptographic Techniques
FSE'07 Proceedings of the 14th 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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In this paper we develop two new chosen plaintext attacks on reduced rounds of the IDEA block cipher. The attacks exploit the word structure of the algorithm and are based on the observation that suitable chosen plaintexts give rise to some special kind of distributions which provide a way to distinguish reduced round IDEA output from a random permutation with very few plaintexts. As a result, we develop an attack for 3.5 rounds of IDEA which requires only 103 chosen plaintexts. We have reduced the number of required plaintexts significantly up to 4 rounds. We also present some interesting properties of the reduced round variants of the cipher which have not been published before. The properties and the attacks bring a different approach to analyse the cipher.