对加密文件解密，验证用公钥解密签名与解密文件的MD 5值比较，以判断文件是否被修改。
Encrypted files decryption, authentication using public key to decrypt the signature and decrypt files MD5 value to determine whether a document is modified.
最后提出了用软件对PE可执行文件的加密解密方法。
Finally a software encryption and decryption method of PE file is put forward.
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