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For other uses, see Password (disambiguation).

A password is a form of secret authentication data that is used to control access to a resource. The password is kept secret from those not allowed access, and those wishing to gain access are tested on whether or not they know the password and are granted or denied access accordingly.
The use of passwords goes back to ancient times. Sentries guarding a location would challenge for a password. They would only allow a person in if they knew the password. In modern times, passwords are used to control access to protected computer operating systems, mobile phones, cable TV decoders, automated teller machines (ATMs), etc. A typical computer user may require passwords for many purposes: logging in to computer accounts, retrieving e-mail from servers, accessing files, databases, networks, web sites, and even reading the morning newspaper online.
Despite the name, there is no need for passwords to be actual words; indeed passwords which are not actual words are harder to guess (a desirable property), but are generally harder for users to remember (an undesirable property). Note that password is often used to describe what would be more accurately called a passphrase. Passcode is sometimes taken to imply that the information used is purely numeric, such as the personal identification number (PIN) commonly used for ATM access. Passwords are generally short enough to be memorized.

Contents [hide] 1 Designing a personal, user-friendly password 2 Factors in the security of a password system 2.1 Rate at which an attacker can try out guessed passwords 2.2 Form of stored passwords 2.3 Methods of verifying a password over a network 2.3.1 Simple transmission of the password 2.3.2 Transmission through encrypted channels 2.3.3 Hash-based challenge-response methods 2.3.4 Zero-knowledge password proofs 2.4 Procedures for changing passwords 2.5 Password longevity 2.6 Number of users per password 2.7 Design of the protected software 3 Factors in the security of an individual password 4 Alternatives to passwords for access control 5 Website password systems 6 Password cracking 7 History of passwords 8 See also 9 References 10 External links

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