提高快速加密算法FEAL安全性研究

Research of improving the security of fast encryption algorithm FEAL

FEAL作为一种快速的加密算法 ,在安全性要求较低的领域中 ,有着非常广阔的应用前景 .文中在分析FEAL算法中子密钥与明文结合形成密文工作流程的基础上 ,找出了密文与明文之间的比特依赖性 ,提出通过增强密文与明文间比特依赖性提高该算法安全性的两种方法 。

The algorithm FEAL is an encryption algorithm, which is similar to that of DES annulus functions. Due to its relatively less demanding annulus numbers, it can be used to calculat e the velocity of FEAL comparatively fast. Its security, however, does not work effectively. In multimedia communiation, prescription must be first ensured, but presently most of encryption algorithms can not meet this requirement. As a fas t encryption algorithm, the FEAL has quite wide applications in the field of sec urity. In order to solve the problem of secuity, the author analyses the bits de pendence of ciphertext on plaintext in Fast Encryption Algorithm FEAL and presen ts two solutions in improving the Security by strengthening the dependence of ci phertext on plaintext, thus enhancing the Security of Fast Encryption Algorithm FEAL effectively with high speed.