The Shadow File

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This is the first post to The Shadow File. I suppose a brief explanation is in order. What is The Shadow File? In Unix and Linux, an algorithm is used to create a one-way hash of a user’s password. This hash, along with the username and other information used to be stored in /etc/passwd. In many modern *nix systems, the password hash has been removed from the passwd file and is now stored in a separate file, because the passwd file is world-readable. This way, an attacker would have to obtain both files in order to attempt to recreate the password. The file that contains the password hashes is /etc/shadow. Now you know.

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