摘要
随着Internet的普及，计算机的安全问题越来越重要，出现了许多关于计算机安全的加密算法，进年来分组密码新的算法不断涌现，而其中IDEA算法就是其中对数据加密的1种重要加密算法，它在方法论上是新颖的，而且速度快。其特点就是加密与解密相同，只是密钥各异。无论用软件或硬件来实现都不难。加密与解密运算速度都非常快。
而我们在这个软件中主要是实现了从文件中读取数据，对读取的数据进行加密。并把加密后的文件保存到文件中。其后实现了对加密文件的解密，解密后与原文比较。最后就是为了解决假冒问题的数字签名。
国际数据加密算法是分组密码的佼佼者，因此在现今的数据加密方面应用很多。
关键字：加密;解密;密钥;数字签名
Abstract
With the Internet popularization, the computer security problem is becoming more and more important.As a result,,it appeared many algorithm about the computer security encryption , in recent yeas new algorithm of block cipher have emerged in large numbers,but IDEA algorithm is an important one of the data encryption encryption algorithm. In the methodology it is novel, moreover the speed is quick..Its character is the encrypt and the decipher is same, only the key is respectively different. It doesn’t difficult to realize it with the software or the hardware .The encryption and the decipher operating speed is both extremely quick.
But what we mainly obtain in this software is we have read the data from the document, which had been carried on the encryption ,and then we decipher the documents which have been encrypted, furthermore, we compare the two kinds of documents.The last problem is in order to solve the digital signature of counterfeit question.
The international data encryption algorithm is the outstanding one in block cipher,therefore,nowadays there are a lot of applications in data encryption .
Keywords: encryption; decrypt,;key;digital signature
