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K

Key:

The numerical value used to control cryptographic operations, such as decryption, encryption, signature generation, or signature verification.

Key pair:

A public key and its corresponding private key. Two mathematically related keys having the property that one key can be used to encrypt a message that can only be decrypted using the other key.

Keylogger:

Software or hardware that tracks keystrokes and keyboard events, usually surreptitiously / secretly, to monitor actions by the user of an information system.