By Kefei Chen, Dongdai Lin, Moti Yung
This ebook constitutes the completely refereed post-conference lawsuits of the twelfth foreign convention on info protection and Cryptology, Inscrypt 2016, held in Beijing, China, in November 2016.
The 32 revised complete papers provided have been conscientiously reviewed and chosen from ninety three submissions. The papers are equipped in topical sections on symmetric ciphers; public-key cryptosystems; signature and authentication; homomorphic encryption; leakage-resilient; post-quantum cryptography; dedication and protocol; elliptic curves; safety and implementation.
Read or Download Information Security and Cryptology: 12th International Conference, Inscrypt 2016, Beijing, China, November 4-6, 2016, Revised Selected Papers PDF
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Additional info for Information Security and Cryptology: 12th International Conference, Inscrypt 2016, Beijing, China, November 4-6, 2016, Revised Selected Papers
33–46, 2017. 1007/978-3-319-54705-3 3 34 W. Yi et al. Table 1. 7 Enc Sect. 7 Enc Sect. 9 Enc Sect. 9 Enc Sect. 2 CPs refer to the number of chosen plaintexts, KPs refer to the number of known plaintexts, Enc refers to the number of encryptions. [6,9,13,16], improbable diﬀerential attack [1,14,15] and zero-correlation linear cryptanalysis . Since CLEFIA adopts a 4-branch generalized Feistel structure as the fundamental structure, in which there are two 4-byte F-functions per round, the designers  showed that there are 9-round impossible diﬀerentials in CLEFIA, that is, (0, α, 0, 0) (0, α, 0, 0) and (0, 0, 0, α) (0, 0, 0, α), where α is any 32-bit nonzero value.
And output diﬀerences, then store all possible input-output pairs into the corresponding cells of the table that have the same input and output diﬀerences. For f3 function, we exclude the modular subtraction operation with Kmi and compute the DDT s for remained part according to the value of Kri . Since there are 25 values of Kri , we need to compute 32 tables. Without loss of generality, we denote them as DDTj3 (j = 0, 1, . . , 31). However, it is worth noting that the input diﬀerences are subtractive diﬀerences (modulo 232 ) and the output diﬀerences are xor diﬀerences in these DDT s.
Store the maximum value of counter V and corresponding (Kr2 , Km8 , Kr8 , Km9 , Kr9 ). (Kr2 , Km8 , Kr8 , Km9 , Kr9 ) with the maximum happen times is considered as the right key. of round 6 and round 7. The complexity is smaller than what we need to recover Km8 , Kr8 , Km9 , Kr9 and Kr2 , which can be ignored. Subkeys of the ﬁrst 5 rounds also can be recovered with similar way. In order to illustrate the key recovery phase more succinctly, the whole key recovery phase is summarized in Algorithm 1.