ELECTRONIC MAIL SERVICE METHOD USING ELECTRONIC STAMP

摘要

PURPOSE: An electronic mail service method using an electronic stamp is provided to send electronic mails, by receiving and authenticating hidden electronic stamps issued from an electronic stamp issue device. CONSTITUTION: A user device selects a parameter randomly, generates a hidden electronic stamp candidate T', and transmits it to an electronic stamp issue device(201). The electronic stamp issue device signs the hidden electronic stamp candidate T', and issues a hidden electronic stamp candidate T" to the user device(202). The user device receives a hidden electronic stamp from the electronic stamp issue device, removes the hidden from the hidden electronic stamp, and restores the electronic stamp(203).