• A character string which serves for authentication or the fulfillment of other security requirements. Used, for instance, to log on to a system, make system changes, protect files, gain access to networks or specific sections of networks, and so on. Passwords such as those consisting of the actual name of a user, that of a close relative, words commonly found in dictionaries, or those having only a couple letters repeated tend to be easy to crack. Those with non-alphabetic characters, mixed case alphabetic characters, or combinations of these tend to be harder to crack. In addition, passwords should have at least six characters, ought to be frequently changed, and must never be written down.

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