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计算机密码学是研究计算机信息加密、解密及其变换的科学，是数学和计算机的交叉学科，也是一门新兴的学科。随着计算机网络和计算机通信技术的发展，计算机密码学得到了前所未有的重视并迅速地发展和普及起来。密码学包括密码编码学和密码分析学两部分。

Computer cryptography is the study of computer information encryption, decryption and transform science, mathematics and computer interdisciplinary , but also an emerging discipline . As computer networks and computer communication technology , computer cryptography has been unprecedented attention and rapid development and popularization up . Including cryptography Cryptography and cryptanalysis two parts. The former is the study of variation and giving back to the preparation of the password password to protect confidential information science , the study of how to change the encoding technology in the form of information to be protected so that the encoded information in addition to others outside the designated receiver can not understand ; after were analyzed to study the law and use the password change analysis ( interpretation ) password to access information and intelligence science , the study of how to break a cryptographic system , restore the true colors of hidden information . Cryptography is to achieve the confidentiality of information , cryptanalysis is to achieve the information decrypted , the two parts complement each other and promote each other , but also contradictory aspects.

在20世纪70年代，密码学的研究出现了两大成果，一个是1977年美国国家标准局以（NBS）颁布的联邦数据加密标准（DES），另一个是1976年由Diffie和Hellman提出来的公钥密码体制的新概念。DES将传统的密码学发展到了一个新的高度，公钥密码体制的提出被公认是实现现代密码学的基石。这两大成果已成为近代密码学发展史上两个重要的里程碑。

In the 1970s , research into cryptography appeared two results , one in 1977 to the U.S. National Bureau of Standards (NBS) issued by the Federal Data Encryption Standard (DES), the other is 1976 by Diffie and Hellman proposed by a new concept of public key cryptography . The traditional DES cryptography developed to a new height, the proposed public key cryptosystem is recognized as a cornerstone of modern cryptography implemented . These two achievements of modern cryptography has become an important milestone in the history of two .

在计算机密码学中，涉及明文和密文。被隐藏和原始消息称为明文（PlainText），明文用M表示。密文（CiperText）是明文经过变换后的信息，一般是难以识别的。密文用C表示。

In computer cryptography , involving the plaintext and ciphertext. Is hidden and the original message is called plaintext (PlainText), expressly denoted by M . Ciphertext (CiperText) is expressly After the conversion information , is generally difficult to identify . Ciphertext denoted by C .

Cryptographic algorithm (Algorithm) encryption and decryption some formulas, rules or procedures are functions in most cases . Cryptographic algorithm provides plaintext and ciphertext transformation rules between . Encryption algorithm used is called encryption algorithm decryption algorithm used is called decryption algorithms.

Key (Key) for data encryption or decryption is used when a special information ( tool ) , the password can be regarded as a parameter in K . Called the encryption key used in the encryption key , the decryption key used for decryption key is called .

Cryptography algorithm is , plaintext , ciphertext , and the key can be composed of a system to encrypt and decrypt information .
The plaintext M from the ciphertext C to a mathematical conversion process is expressed as : E (M) = C
On the contrary , from the ciphertext to recover the plaintext M, D is expressed as a mathem本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。