Paper 2023/566 Improved Differential Cryptanalysis on SPECK Using Plaintext Structures , Jinan University , Jinan University , Jinan University , Chinese Academy of Sciences, University of Chinese Academy of Sciences , Jinan University , Jinan University Abstract Plaintext structures are a commonly-used technique for improving differential cryptanalysis. Generally, there are two types of plaintext structures: multiple-differential structures and truncated-differential structures.