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计算机网络正飞速发展,大量数据的存储、分配和保护变得越来越重要。为解决安全问题而提出的DES在数据加密领域一直占据着重要的地位并被广泛应用于其它领域。DES是一种利用代换和置换网络快速实现混淆和扩散的分组密码体系。DES的分组长度为64bit,有效密钥长度为56bit。由于密钥长度太短不能够有效地防止暴力破解,可进行DES的组合来满足加密安全性的要求。
Computer networks are rapidly evolving, and the storage, distribution and protection of large amounts of data is becoming more and more important. DES, which is proposed to solve the security problem, has been playing an important role in data encryption and has been widely used in other fields. DES is a packet cipher system that uses substitution and permutation networks to quickly achieve confusion and proliferation. The packet length of DES is 64bit, the effective key length is 56bit. Due to the short key length can not effectively prevent brute force, DES can be combined to meet the requirements of encryption security.