REDUCTION OF UNWANTED AND UNSOLICITED ELECTRONIC MESSAGES NOT REQUESTED BY RECEIVER TO BE TRANSMITTED

摘要

PROBLEM TO BE SOLVED: To enable the generation of an input for more reliably classifying electronic messages, for example, as unwanted and/or unsolicited electronic messages, which are not requested by a receiver to be transmitted, by supplying the electronic messages to a message classifying module. SOLUTION: An answer document, in which an answer hash value calculated from the combination of an answer document and a puzzle input hash value becomes an answer value for a computational puzzle, and en electronic message including electronic message data are transmitted to a receiving computer system. COPYRIGHT: (C)2010,JPO&INPIT