Abstract: A computer system with secured data paths consists of a main computer with a main processor, associated main memory, main input/output devices, and main data paths interconnecting the main processor, main memory, and main input/output devices; a security computer with a security processor, security memory, an operator console, and security data paths, connected to the main data paths of the main computer so as to intercept all data flowing along the main data paths; and a test computer with a test processor, test memory, test input/output devices, and test data paths, connected to the security computer. The main computer executes user programs, the security computer executes security programs, and the test computer test-executes user programs.

Abstract: An apparatus and method for dynamic encryption of information including data, voice, and graphics, consisting of a random access memory containing encryption and decryption programs and the information to be encrypted and decrypted, an encryption processor executing the encryption and decryption programs, the encryption and decryption programs being a code set whose members are distinct encryption/decryption codes executed serially by the encryption processor to encrypt and decrypt the information, and also being optionally repetitively executed, and a data set in the random access memory specifying the order and execution and number of repetitions of each member of the code set.