CIPHERING SYSTEM, SIGNATURE SYSTEM, KEY COMMON SHARE SYSTEM, IDENTITY PROVING SYSTEM AND DEVICE FOR THE SYSTEMS

摘要

PROBLEM TO BE SOLVED: To surely prevent an other 3rd party than the entity from posing as an entity by using a tribute information specific to the entity or compression- conversion information as a key. SOLUTION: Attribute information B11 itself specific to an entity 11 is used for a public. key K11 used for any or some of 'ciphering system based on ID', 'signature system based on ID', 'common share key system', and 'identity proving system based on ID'. Then a verification party reads the public key K11 from a data carrier 12 indicated by the entity 11, that is, the attribute information B11 of the entity 11 by using a reader 13, an observation device 14 observes the attribute information and a comparator 15 compares the observed information with the read information to confirm whether or not the entity 11 is a legal (genuine) possessor of the carrier 12, that is, the physical biometric attribute information B11 recorded in the data carrier 12 is a public key of the entity 11.