| 摘要 |
PROBLEM TO BE SOLVED: To enable the synchronization of the occurrence of a random number between a main board and a sub board in a game machine for using a random number by a linear congruential method to encrypt command transmission from the main board to the sub board.SOLUTION: When a command comprises telegraphic messages 1 to 4, a telegraphic message 1 is a main telegraphic message and always exists, but the telegraphic messages 2 to 4 are a sub telegraphic message and exist following a portion of commands, the telegraphic message 1 is not encrypted, but the telegraphic messages 2 to 4 are encrypted. The sub board decrypts the telegraphic messages 2 to 4 by using the same random number as the random number used for encryption. A telegraphic message 1 of a special command is encrypted by using a prescribed constant number in place of telegraphic messages 2 to 4. The sub board performs decryption by using the prescribed constant numbers to acquire a random number. The sub board adjusts an own random number generator on the basis of the acquired random number.SELECTED DRAWING: Figure 9 |
