scispace - formally typeset
Search or ask a question
Author

Li Kangman

Bio: Li Kangman is an academic researcher from Hengyang Normal University. The author has contributed to research in topics: Block cipher & Cryptography. The author has co-authored 3 publications.

Papers
More filters
Patent
19 Jun 2020
TL;DR: In this paper, a novel high-security lightweight ECEG block cipher implementation method and system and a storage medium was proposed, key expansion is carried out based on an NP difficult problem of elliptic curve discrete logarithm, and the expansion enables a password attacker to be difficult to infer what an original key is even if the password attacker obtains a key of an intermediate round, so the security of the password is further improved.
Abstract: The invention provides a novel high-security lightweight ECEG block cipher implementation method and system and a storage medium. Key expansion is carried out based on an NP difficult problem of elliptic curve discrete logarithm, and the expansion enables a password attacker to be difficult to infer what an original key is even if the password attacker obtains a key of an intermediate round, so the security of the password is further improved, and the ECDLP is applied to the field of encryption and decryption of the block password for the first time; besides, the technical scheme of the invention further provides an extended generalized Feistel structure, which is different from a conventional Feistel structure, an MDS matrix is generated after four times of iteration, the MDS matrix mainly plays a diffusion role in the whole cryptographic algorithm, and the matrix is utilized to perform column obfuscation operation. The diffusion layer formed by the MDS matrix can optimally resist differential attacks and linear attacks, and the security of the algorithm in the technical scheme can be further improved when the diffusion layer is applied to the technical scheme of the invention.
Patent
31 Jul 2020
TL;DR: In this paper, a block cipher MEG implementation method and device and a storage medium are described, and a novel secret key expansion mode is provided, i.e., matrix multiplication on a finite field is carried out by using a generation matrix of a maximum distance separable code which can be used for constructing an optimal diffusion layer and an original secret key, so that the operation of expanding the original key is completed.
Abstract: The invention discloses a block cipher MEG implementation method and device and a storage medium. According to the technical scheme of the invention, a novel secret key expansion mode is provided, i.e., matrix multiplication on a finite field is carried out by using a generation matrix of a maximum distance separable code which can be used for constructing an optimal diffusion layer and an original secret key, so that the operation of expanding the original secret key is completed. An extended generalized Feistel structure is adopted, and an optimal diffusion layer is generated after four times of iteration and used for column obfuscation operation. The optimal diffusion layer not only has ideal confusion characteristics, but also has the best effect of resisting differential attacks and linear attacks, so that the security of the algorithm can be further improved. According to the technical scheme provided by the invention, when hardware is realized, the matrix used for key expansionis a cyclic matrix, and the original key can be expanded only by storing 16-bit elements, so that the storage space is saved and the resource occupation area of the algorithm is reduced while the security of the cryptographic algorithm is improved.
Book ChapterDOI
Li Qiuping1, Li Lang1, Zhang Jian1, Zhao Junxia1, Li Kangman1 
01 Jan 2021
TL;DR: A new method to construct the lightweight MDS matrices is given and it is proved that the 2s × 2s involution Hankel MDS matrix does not exist in finite field.
Abstract: Maximal distance separable (MDS) matrices are used as optimal diffusion layers in many block ciphers and hash functions Recently, the designers paid more attention to the lightweight MDS matrices because it can reduce the hardware resource In this paper, we give a new method to construct the lightweight MDS matrices We provide some theoretical results and two kinds of 4 × 4 lightweight Hankel MDS matrices We also prove that the 2s × 2s involution Hankel MDS matrix does not exist in finite field Furthermore, we searched the 4 × 4 Hankel MDS matrices over GL(4, F2) and GL(8, F2) that have the better s-XOR counts until now