PRESENT: An Ultra-Lightweight Block Cipher
CHES '07 Proceedings of the 9th international workshop on Cryptographic Hardware and Embedded Systems
KATAN and KTANTAN -- A Family of Small and Efficient Hardware-Oriented Block Ciphers
CHES '09 Proceedings of the 11th International Workshop on Cryptographic Hardware and Embedded Systems
A 3-subset meet-in-the-middle attack: cryptanalysis of the lightweight block cipher KTANTAN
SAC'10 Proceedings of the 17th international conference on Selected areas in cryptography
LBlock: a lightweight block cipher
ACNS'11 Proceedings of the 9th international conference on Applied cryptography and network security
A cryptanalysis of PRINTcipher: the invariant subspace attack
CRYPTO'11 Proceedings of the 31st annual conference on Advances in cryptology
CHES'11 Proceedings of the 13th international conference on Cryptographic hardware and embedded systems
Searching for compact algorithms: CGEN
VIETCRYPT'06 Proceedings of the First international conference on Cryptology in Vietnam
SEA: a scalable encryption algorithm for small embedded applications
CARDIS'06 Proceedings of the 7th IFIP WG 8.8/11.2 international conference on Smart Card Research and Advanced Applications
HIGHT: a new block cipher suitable for low-resource device
CHES'06 Proceedings of the 8th international conference on Cryptographic Hardware and Embedded Systems
KLEIN: a new family of lightweight block ciphers
RFIDSec'11 Proceedings of the 7th international conference on RFID Security and Privacy
Improved related-key differential attacks on reduced-round LBlock
ICICS'12 Proceedings of the 14th international conference on Information and Communications Security
Cube cryptanalysis of LBlock with noisy leakage
ICISC'12 Proceedings of the 15th international conference on Information Security and Cryptology
Comprehensive study of integral analysis on 22-round LBlock
ICISC'12 Proceedings of the 15th international conference on Information Security and Cryptology
A unified method for finding impossible differentials of block cipher structures
Information Sciences: an International Journal
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LBlock is a new lightweight block cipher proposed by Wu and Zhang (2011) [12] at ACNS 2011. It is based on a modified 32-round Feistel structure. It uses keys of length 80 bits and message blocks of length 64 bits. In this letter, we examine the security arguments given in the original article and we show that we can improve the impossible differential attack given in the original article on 20 rounds by constructing a 22-round related key impossible differential attack that relies on intrinsic weaknesses of the key schedule. This attack has a complexity of 2^7^0 cipher operations using 2^4^7 plaintexts. This result was already published in Minier and Naya-Plasencia (2011) [9].