Patent ID: 7376833

Claim:
An anonymous decryption system which takes as input an encrypted data list that includes a plurality of items of encrypted data that have been encrypted by a specified method and specified public information and which supplies results of decrypting each item of encrypted data without relation to order on the list; said anonymous decryption system comprising: a shuffling management center for, when an encrypted data list is received as input from the outside, transferring the encrypted data list to a decryption shuffle center, and when a data list is returned from said decryption shuffle center, supplying said data list as a decryption result list; and the decryption shuffle center for subjecting an encrypted data list which has been transferred from said shuffling management center to both an order-switching process using public information and a partial decryption process using a decryption key possessed by that decryption shuffle center and returning the resulting data list to said shuffling management center.