JPS5647850A - Data processing system - Google Patents

Abstract

PURPOSE:To realize sending and receiving a secret data to and from each computer center, by calculating a position in the secret data based on both the intrinsic information the the incidental information of each computer center in case of receiving and sending a data between each computer system, and ciphering its position. CONSTITUTION:When the electronic computer 1 starts writing to a data relay medium 4, at first it inputs the intrinsic information such as unit manufacturing No. of a destined electronic computer 2, etc. into the unit intrinsic information register 11d, and subsequently inputs the incidental information of a sending side electronic computer 1 into the register 11a. Being based on the contents of the aforesaid two registers 11a, 11d, the cipher preparing means 11s prepares a cipher embedding position and a data for embedment, and the embedding means 11p embeds a designated cipher into a position designated by the means 11s, transfers it to the data buffer 11t, and it is output to the medium 4 by the input/output nameee11x. When the electronic computer 2 loads the contents of the medium 4, it calculates a cipher embedding position and a data for embedment by the self-intrinsic information and the incidental information, inspects whether there is a calculated cipher in the loaded data or not, and if it is correct, a data except a cipher is loaded.