机构地区: 南开大学信息技术科学学院
出 处: 《吉林大学学报(工学版)》 2012年第5期1257-1261,共5页
摘 要: 提出了两种变长编码字符型数据的保留格式加密方案。方案1基于Feistel网络构建合适的分组密码,并结合cycle-walking确保密文输出在合理范围内,适用于明文较短且需要隐藏字符个数的保留格式加密;方案2将明文消息空间划分为若干子集,在子集上进行定长编码字符型数据的加密,具有较高效率,适用于任意明文长度的保留格式加密。 Two Format-Preserving Encryption(FPE) schemes suitable for variable-length encoding character data were proposed.Scheme I constructs the block cipher based on Feistel network,and combines cycle-walking to ensure that the ciphertext is in legitimate range.This scheme can be applied in FPE on short plaintext,and meets the needs of hiding the count of characters.Scheme II splits the plaintext into several sub-character sets,and then it executes the FPE of fixed-length encoding character data on each sub-set.Scheme II is more efficient and applicable to FPE on plaintext of any length.
关 键 词: 计算机系统结构 保留格式加密 变长编码 字符型数据 网络
领 域: [自动化与计算机技术] [自动化与计算机技术]