Key generation method of encryption / decryption key, encryption / key generation apparatus of the decryption key, encryption / decryption key of key generation program, as well as recording medium readable by a computer

摘要

PROBLEM TO BE SOLVED: To provide a method for safely acquiring an encoding key and a decoding key.;SOLUTION: The method for generating encoding/decoding key using a computer includes a step where first and second receiving parts sample random signal from a prescribed source by a prescribed method, a step where the random signal sampled by the first and second receiving parts is divided into tag information and key information, a step where the tag information acquired by the first and second receiving parts is exchanged with each other, a step where a common tag is extracted from the set of tag information exchanged between the first and second receiving parts, and a step where the first and second receiving parts generate keys for encoding and decoding using key information corresponding to the common tag.;COPYRIGHT: (C)2004,JPO