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Authentication is a process by which a system verifies the identity of a user. Authentication may also be generalized by saying that "To authenticate" means "To authorize". For example, users tend to pick passwords that can be easily guessed, on the other hand, if a password is hard to guess, then it is often hard to remember. To address this problem some researchers have developed authentication methods that use pictures as passwords, known as graphical passwords. The authors classify these techniques into two categories: recognition-based and recall-based approaches which are discussed in this paper along with the strengths and limitations of each method. They have proposed a new technique for authentication.
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