Abstract:
Data Encryption Standard(DES) is a realization of Feistel algorithm, but the length of its key is too short. It can not meet the needs of network security now. Aiming at this problem, this paper proposes a simple method of key extension for the DES. This method extends DES key from 56 bit to 112 bit, and proves its validity by experimental result.
Key words:
Data Encryption Standard(DES),
key extension,
encryption
摘要： 数据加密标准(DES)是Feistel网络型加密算法的实现，但DES的密钥长度较短，不能适应目前网络安全的需求。为此，提出一种DES密钥延长方法，将DES算法的密钥长度由56 bit扩展到112 bit。理论和实例测试结果表明，使用该方法改进后的DES算法加密有效。
关键词:
数据加密标准,
密钥延长,
加密
CLC Number:
QIU Wei-Xing, XIAO Ke-Zhi, NI Fang, HUANG Hua. DES Key Extension Method[J]. Computer Engineering, 2011, 37(5): 167-168,171.
邱伟星, 肖克芝, 倪昉, 黄华. 一种DES密钥延长方法[J]. 计算机工程, 2011, 37(5): 167-168,171.