期刊名称：International Journal of Soft Computing & Engineering
电子版ISSN：2231-2307
出版年度：2013
卷号：3
期号：5
页码：183-187
出版社：International Journal of Soft Computing & Engineering
摘要：DESL & DESXL are new lightweight variants of DES using serial hardware architecture and replace the 8 original S-Boxes by a one S-Box for reducing the gate complexity. The S-box has been highly optimized in such a way that DESL resists common attacks, i.e. linear and differential cryptanalysis, and the Davies-Murphy-attack. Therefore DESL achieves a security level, which is appropriate for many applications. Additionally the initial permutation (IP) and its inverse (IP-1) are omitted, because they do not provide additional cryptographic strength. The main goal of the developer was to reduce gate count in hardware implementations as compared to the original DES. DESL shows that differential cryptanalysis is not feasible anymore. It is more resistant against linear cryptanalysis than DES due to the improved non-linearity of the S-box. It is more secure, size-optimized, and power efficient than DES for this reason it is to be considered as an alternative for stream ciphers. For higher security, key whitening technique DESXk.k1.k2(x) = k2 ⊕DESk(k1 ⊕x) is used . The 64 most significant bits and the 64 least significant bits are used for key whitening in order to prevent brute-force attack requires 256plaintexts. DESL is more resistant against linear cryptanalysis requires about 243chosen ciphertext. Ciphers are more resistant against linear cryptanalysis than DES due to the improved non-linearity of the S-box. DESL is secure, size-optimized, and power efficient for this reason DESL is to be considered as an alternative for stream ciphers
