Kerberos         Authentication security system used on Windows 2000 Server and above
                 and other OSs.

Kernel           The heart of an operating system which manages and loads application
                 programs and loads drives as and when required by the system.

Keyboard         Input device consisting of typewriter style QWERTY keyboard layout
                 with letters, digits, symbols and special function keys.

KeyLogger        A program that records key strokes to gather private information such
                 as usernames, passwords, account numbers, pins etc to gain unauthorised 
                 information. See Spyware.

Kilobytes        Number of bytes in thousands. 1KB is equal to 1024 bytes (2^10).