2D Key
Encyclopedia
A 2D key is a special type of password
Password
A password is a secret word or string of characters that is used for authentication, to prove identity or gain access to a resource . The password should be kept secret from those not allowed access....

 input method proposed by Kok-Wah Lee since year 2005, that is input in a special grid, instead of a single line. This enables the user to create memorizable (or mnemonic) but long passwords, such as ASCII art
ASCII art
ASCII art is a graphic design technique that uses computers for presentation and consists of pictures pieced together from the 95 printable characters defined by the ASCII Standard from 1963 and ASCII compliant character sets with proprietary extended characters...

, allowing extreme security.
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