Weak keys of the full MISTY1 block cipher for related-key amplified boomerang cryptanalysis.

The MISTY1 block cipher has a 64-bit block size, a 128-bit master key, and a total of 8 rounds. It is an ISO international standard, a Japanese CRYPTREC-recommended e-government cipher, and a European NESSIE selected cipher. In this study, the authors show another cryptographic weakness of the full MISTY1 cipher: they describe four classes of 290 weak keys of the full MISTY1 cipher for a related-k...