a private key encryption-decryption algorithm that uses a key that is twice the length of a data encryption standard ( des ) key 一种密钥加密-解密算法,其使用一种两倍于数据加密标准(des)密钥长度的密钥。
then, restoration of data loss resulting from transmission after scrambling is also progressed . in the end of this thesis, the decryption algorithm of the pure position permutation algorithms is proved 最后,我们分析了新算法的速度和安全性,并对其置乱效果进行了对比和评价,并验证了其在完整性保护方面的功能。
before the history of appearing public-key cryptography, all the encryption and decryption algorithms including the original manual calculations, implemented by mechanical equipment or computer, they are based on these two basic tools : replacement and substitution 在公钥密码体制以前的整个密码学史中,所有的密码算法,包括原始手工计算的、由机械设备实现的以及由计算机实现的,都是基于代换和置换这两个基本工具。
this thesis has a detail investigation on camellia and the central contribution is as follows : 1 . a detail introduction of camellia is presented, including encryption algorithm, decryption algorithm and key schedule algorithm, and also, the design idea and design principle is presented 本文对camellia算法进行了深入的研究,主要成果有:1.对camellia算法进行了详细的介绍,包括加密算法、解密算法和密钥编排方案,并阐述了其设计理念和设计准则。
after earnest studying code system, the theory of encryption, decryption algorithm, oil fieldwork, i adopt " liu's high intensity public encryption algorithm " and public key encryption rsa . we have designed and developed the " data encryption and decryption applying system based on file " . this system according to the real text file of oilfield scene and image file of autocad, we have finished the integration of system and have lay a foundation in order to resolve the problem of data security 在深入研究密码体制、加密算法原理、油田现场实际工作以及前人工作的基础上,在这里,作者应用刘氏高强度公开加密算法与rsa公开密钥加密算法有机地结合起来,在delphi5.0平台上用面向对象的pascal语言构建了“基于文件的加密解密应用系统”,以油田现场实际应用中的文本文件及autocad图形文件为原型,设计并构建此系统,并使系统集成化,可以独立安装运行。