Related-Key Impossible Differential Cryptanalysis of LBlock

A related-key impossible differential attack on 24-round LBlock is constructed by using new 16-round related-key impossible differentials and adding 4 rounds at the top and 4 rounds at the bottom of these 16-round related-key impossible differential paths. The data and time complexities are about 2⁶³ chosen plaintexts and 2^75.42 24-round encryptions respectively.