Remote-auditing of computer generated outcomes using cryptographic and other protocols

A computer device and method for encoding a message corresponding to an outcome of a computer game, and a computer device and method for decoding the message to detect a fraudulent outcome. The computer device used to generate the encoded message includes a memory device containing encoding control code and a processor configured to process the encoding control code in conjunction with a computer game outcome (148) to generate an encoded message containing the computer game outcome (158) and to transmit the encoded message (154) to a human-readable output device, such as a display device. The computer device includes various tamper resistant or tamper evidence features. A secure module containing the processor and memory is used to plug into an existing personal computer or dedicated game device. The device also includes a system for metering use of a computer game.