Java加密技术 pdf版，内容介绍BASE64、MD5、SHA、HMAC几种方法，主要描述Java已经实现的一些加密解密算法，最后介绍数字证书。-Java encryption technology PDF version, introduction BASE64, MD5, SHA, HMAC several methods, describes some of the Java has achieved encrypt, decrypt algorithm, and finally in the digital certificate.