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An often-overlooked but nevertheless critical aspect of password-protected systems is the use of a password hash. A password hash is a one-way transformation of a password string that is designed to be difficult for an attacker to reverse. An attacker who gains access to a password hash does not gain the ability to decrypt the original plaintext password. Whereas a hash function is much faster and more convenient than a brute-force method of trying different passwords, a hash function does not provide any further security beyond the security provided by the password itself. A password hash is a form of storage used to make it more difficult to access a password without the password itself. One may use a password hash in place of a password to give a user greater control over the level of security provided, but it should not be used as the only solution to account protection.
Systems which employ passwords as the main component of authentication typically require users to remember them. Users are less likely to memorize longer strings. Therefore, passwords have been replaced with more complicated, more secure mechanisms, such as passwords stored with the help of hash functions, passwords generated using complicated schemes, or one-time-passwords (OTPs).
Password reuse is a security risk because an attacker who obtains a password can use it to gain unauthorized access to numerous other accounts. An attacker who obtains one password can often use the same credentials to access an additional target account. For example, an attacker who obtains a user's username and password to a financial institution's web site can access other online accounts linked to that financial institution. The most important barrier to reducing password reuse is not technological but the user: users are unlikely to change their passwords unless forced to do so by the service provider.[16]
Certain forms of biometric authentication, such as those using facial recognition or a retinal scanner, are considered more secure than passwords because they can be made practically impossible for an attacker to reproduce.
The most common application of password-protected authentication systems is to protect against unauthorized access to an online service such as a web site or an application. An attacker who wants to gain unauthorized access to a service typically doesn't have knowledge of the cryptographic credentials used to protect access to the service; therefore, the attacker typically needs to obtain valid cryptographic credentials.[17]
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