A VERIFICATION METHOD FOR OPERATION OF ENCRYPTION APPARATUS ANDITS APPLICATION TO ELECTRONIC VOTING

摘要

A method for verifying operation of an encryption device and an electronic voting verification system using the same are provided to obey a principle of secret voting by assuring normal operation of an electronic voting device at least 50 percents and preventing other users from verifying a voting value of a user at the same time. An encryption device is equipped with an operator for operating encryption, and a random number generator, and has no decryption key but an encryption key. A screen display device displays more than two ciphertexts, which are respectively generated for all plaintexts of a finite plaintext space, in a screen. A first selector selects one among a plurality of ciphertexts for all plaintexts displayed in the screen display device. A second selector selects one of the ciphertexts selected by the user. A certificate issuance device issues a certificate recording the ciphertext not selected by the first selector and encryption information used by the encryption device when the ciphertext is generated, and issues the certificate recording the ciphertext selected by the second selector.