Idle Cycles Based Concurrent Error Detection of RC6 Encryption
DFT '01 Proceedings of the 16th IEEE International Symposium on Defect and Fault-Tolerance in VLSI Systems
Optical Fault Induction Attacks
CHES '02 Revised Papers from the 4th International Workshop on Cryptographic Hardware and Embedded Systems
IEEE Transactions on Computers
DSN '04 Proceedings of the 2004 International Conference on Dependable Systems and Networks
FOX: a new family of block ciphers
SAC'04 Proceedings of the 11th international conference on Selected Areas in Cryptography
IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
Fault analysis study of the block cipher FOX64
Multimedia Tools and Applications
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Since its first introduction, differential fault analysis has proved to be one of the most effective techniques to break a cipher implementation. In this paper, we apply a fault attack to a generic implementation of the recently introduced FOX family of symmetric block ciphers (also known as Idea Nxt). We show the steps needed to mount an effective attack against FOX-64. Although the basic characteristics of this cipher are similar to those of AES, FOX uses a non-invertible key schedule which makes it necessary to use a different attack plan. We also estimate the number of faulty ciphertexts required to reveal the secret key. Our results can be easily extended to other variations of the cipher that use longer inputs and keys.