In computing, the term munge (munj) means to create a strong, secure password through character substitution. "Munge" is sometimes backronymmed as Modify Until Not Guessed Easily. The usage differs significantly from Mung (Mash Until No Good), because munging implies destruction of data, while mungeing implies creation of strong protection for data.

The case for mungeing

Passwords are used to gain access to computer resources, and computer users generally choose passwords that are easy to remember, but therefore insecure. Simple passwords are easily hacked by dictionary attacking software.

If a network administrator supplies a password that is too difficult to remember, or requires that passwords be changed frequently, users tend to write their passwords down to help them remember. Many times passwords can be found on sticky notes under keyboards, behind pictures, or hidden among other desktop items--another security risk.

Mungeing helps to create a strong password that the user can remember easily. The user may choose any word he or she likes, then modifies it to make it stronger.

How to munge

A strong password contains characters from at least 3 of these 4 character sets:

Adding a number and/or special character to a password effectively thwarts dictionary attacks. For example, the password "butterfly" could be munged in the following ways:

The substitutions can be anything the user finds easy to remember, such as: