Differential cryptanalysis of the data encryption standard
Differential cryptanalysis of the data encryption standard
Linear cryptanalysis method for DES cipher
EUROCRYPT '93 Workshop on the theory and application of cryptographic techniques on Advances in cryptology
Initial Observations on Skipjack: Cryptanalysis of Skipjack-3XOR
SAC '98 Proceedings of the Selected Areas in Cryptography
Cryptanalysis of Skipjack reduced to 31 rounds using impossible differentials
EUROCRYPT'99 Proceedings of the 17th international conference on Theory and application of cryptographic techniques
Markov Truncated Differential Cryptanalysis of Skipjack
SAC '02 Revised Papers from the 9th Annual International Workshop on Selected Areas in Cryptography
Flaws in Differential Cryptanalysis of Skipjack
FSE '01 Revised Papers from the 8th International Workshop on Fast Software Encryption
New Results on Boomerang and Rectangle Attacks
FSE '02 Revised Papers from the 9th 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
PRESENT: An Ultra-Lightweight Block Cipher
CHES '07 Proceedings of the 9th international workshop on Cryptographic Hardware and Embedded Systems
A Cryptanalytic View of the NSA's Skipjack Block Cipher Design
ISA '09 Proceedings of the 3rd International Conference and Workshops on Advances in Information Security and Assurance
KLEIN: a new family of lightweight block ciphers
RFIDSec'11 Proceedings of the 7th international conference on RFID Security and Privacy
Energy efficiency of encryption schemes applied to wireless sensor networks
Security and Communication Networks
Cryptanalysis of reduced-round KLEIN block cipher
Inscrypt'11 Proceedings of the 7th international conference on Information Security and Cryptology
Integral and multidimensional linear distinguishers with correlation zero
ASIACRYPT'12 Proceedings of the 18th international conference on The Theory and Application of Cryptology and Information Security
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We consider a range of attacks on reduced-round variants of the block cipher Skipjack. In particular we concentrate on the role of truncated differentials and consider what insight they give us into the design and long-term security of Skipjack. An attack on the full 32 rounds of Skipjack remains elusive. However we give attacks on the first 16 rounds of Skipjack that can efficiently recover the key with about 217 chosen plaintexts and an attack on the middle sixteen rounds of Skipjack which recovers the secret key using only two chosen plaintexts. Several high-probability truncated differentials are presented the existence of which might best be described as surprising. Most notably, we show that the techniques used by Biham et al. can be presented in terms of truncated differentials and that there exists a 24-round truncated differential that holds with probability one.