MD5 (Message-Digest algorithm 5) is a widely used cryptographic hash function with a 128-bit hash value to provide some assurance that a transferred file has arrived intact. You can compare the checksum of a downloaded file, say masterkey-linux-0.1.iso to our pre-computed one stored in a md5 file masterkey-linux-0.1.iso.md5. Generally speaking, if these two hash vaules match, the file you downloaded is identical to the one released on the web site.

To verify the md5 checksum of a downloaded file (i.e., masterkey-linux-0.1.iso) under Linux, you need also download its md5 file in which the pre-computed checksum is stored (i.e., masterkey-linux-0.1.iso.md5). The file to be checked and its md5 file MUST be stored in the same directory.

• In a shell prompt, change to the directory which the related files located in;
• type the following command line: