基于k-分割Feistel网络的FPE方案

FPE scheme based on k-splits Feistel network

基于对保留格式加密(FPE,format-preserving encryption)方案中Feistel网络构造特点的分析,针对当前使用2-分割Feistel网络构造的FPE密码分组长度范围较小的问题,提出基于k-分割type-2 Feistel网络的FPE方案,以适应各种长度数据的加密需求。通过实验验证,type-2 Feistel网络可以使用较小规模伪随机函数构造各种分组长度密码,具有广泛实用性。

The construction features and discipline of Feistel network-based FPE（format-preserving encryption） schemes were analyzed.Considering on the problem that 2-splits Feistel networks-based FPE cipher＇s block size was in narrow range,a type-2 Feistel network-based FPE scheme,which was suitable for constructing FPE cipher with scalable block size,was presented.Experiment show that type-2 Feistel network is able to use small-scaled pseudorandom function to construct cipher with scalable block size and that is practical.