K
KDC - Key Distribution Center (A Kerberos (computer-network authentication protocol) server which receives a request for service from a user, authenticates the user, and provides the user with a "ticket" containing an encryption key which allows the users to send and receive encrypted messages for a communication session.)
KDD - knowledge discovery in database (also known as data mining) (A process of analyzing large volumes of data stored in a central storage device or location, called a warehouse, using tools that look for patterns, trends, correlations, relationships, and anomalies, without knowing the meaning of the data.)
KDF - Key Derivation Function (An algorithm used in key generation which uses random values to ensure that new keys will change, rather than being identical copies of the original key.)
KEK - key encrypting key (A shared master key that is used to encrypt and exchange session keys between two parties.)
KMS - Key Management System (A system that manages keys within a cryptosystem - it deals with the generation, exchange, storage, replacement, use, and destruction of cryptographic keys.)
KPA - known plaintext attack (In the area of cryptanalysis (the study of breaking, or solving, encrypted messages), the analyst compares encrypted messages with known plaintext (unencrypted) results/messages to guess what the enccryption key is.)
KPI - key performance indicator (An indicator considered of particular significance to management in judging/measuring the operation and goals of an information security management system (ISMS), or more generally, the performance of any division within an organization.)
KRI - key risk indicators