The MD5 password hash algorithm is "no longer considered safe" by the original software developer, a day after the leak of more than 6.4 million hashed LinkedIn passwords.

Generate an MD5 checksum file md5sum file.iso > file.iso.md5 Although the process is specific to Ubuntu, you can follow the same tutorial to create .iso and MD5 checksum files in any distro.

Entering a favorite, or, more securely, strange and unique web site into an online MD5 hash generator gives you a seriously long string of characters, uniquely linked to that URL.