MD5的典型应用是对一段信息（Message）产生信息摘要（Message-Digest），以防止被篡改。比如，在UNIX下有很多软件在下载的时候都有一个文件名相同，文件扩展名为.md5的文件，在这个文件中通常只有一行文本，大致结构如：



　　　MD5 (tanajiya.tar.gz) = 0ca175b9c0f726a831d895e269332461



　　这就是tanajiya.tar.gz文件的数字签名。-Typical applications MD5 is a section of information (Message) generated message digest (Message-Digest), in order to prevent tampering. For example, in UNIX there are a lot of software when downloading a file name the same file name extension is. Md5 of the file, in this document are usually only his text, more or less structure, such as: MD5 (tanajiya.tar.gz) = 0ca175b9c0f726a831d895e269332461 This is the digital signature tanajiya.tar.gz documents.