实习二 分组密码加密

一、实习目的

1、理解对称加密算法的原理，熟悉常用的对称加密算法：DES、TripleDES、Blowfish；

2、以DESede加密算法为例，掌握分组加密算法加、解密过程的实现。

二、实习内容

1．[基本要求]

以DES/DESede为例，利用java中的相关类实现对指定字符串的加、解密。

2．[实现提示]

(1) 可以利用java中的KeyGenerator类创建对称秘钥，利用工厂类KeyGenerator的静态方法getInstance()获得KeyGenerator()类对象；

(2) 方法getInstance()的参数为字符串类型，指定加密算法的名称如：Blowfish、DES、DESede、HmacMD5或HmacSHA1等；

(3) 利用工厂类Cipher的对象可以创建密码器。同样的，getInstance()的参数为字符串类型，指定加密算法的名称

-Internship two block cipher encryption

An internship purpose

An understanding of the principles of symmetric encryption algorithms, symmetric encryption algorithms used are familiar: DES, TripleDES, Blowfish

2, DESede encryption algorithm, for example, plus master block encryption algorithm to achieve decryption process.

Second, the practical content

1. [Basic requirements]

With DES/DESede for example, the use of java in the relevant class implements the specified string encryption and decryption.

2. [Achieve prompt]

(1) can be used to create a java class in KeyGenerator symmetric secret key, use the static method getInstance factory class KeyGenerator of () to get KeyGenerator () class object

(2) the method getInstance () argument is a string type, specify the name of the encryption algorithm, such as: Blowfish, DES, DESede, HmacMD5 or HmacSHA1 etc.

(3) the use of factory class Cipher objects can create a password control. The same, getInstance () argument is a string typ