| 摘要 |
Using a sealing function the parent system seals the random number x which is generated by a random number generation means, and it, along with both the sealing function and the result calculation function, is made public by a setting publication means. Each of the subsystems (i ) which will participate in the lottery sends the random number, which is a response, generated by its random number generation means. The result calculation means of the parent system calculates a lottery result by applying the response ri and the initial value x to the result calculation function, and makes public the lottery result, the initial value x and the response ri. Each of the child subsystems (i ) receives this information, and the result verification means determines whether the sealed initial value equals to the value calculated by applying the initial value to the sealing function, and whether the response of each of the child subsystems is recorded, and whether the lottery result equals the value calculated by applying the result calculation function to the initial value x and the response ri. <IMAGE> |
