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Key
In cryptography, a key is a large number used (in conjunction with a cryptographic algorithm) to lock plaintext into ciphertext, and unlock ciphertext into plaintext.
Keystroke Logger
A programs that operates without a users knowledge and records all of the keystrokes. Once the keystrokes are logged, they are hidden in the machine for later retrieval or shipped raw to the attacker. The attacker then carefully goes through the data in hopes of either finding a password, or possibly other useful information. Often used for identity theft.
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