AUTHENTICATION TYPE SECURITY SYSTEM

摘要

PROBLEM TO BE SOLVED: To prevent forgery and copy by recognizing the genuiness of identified data only by means of signated data generated by a system corresponding to a variable generated from reference data based on reference data obtained by reading it from a reference area by a prescribed machine. SOLUTION: Identified data M' among sign data W' from a magnetic strip 3 is divided into reference data F' and management data A'. Then, reference data F' is compared with reference data F" from the reference area and the presence or absence of the genuiness of a card is checked. When a compared result is appropriate hashing processing is executed on identified data M' and hushing data D' is obtained. At the same time, signated data among data with sign W' is inversely converted into multivariable polynomial tuple Q. At that time, a variable u' is generated from reference data F' and a constant used for the multivariable polynomial tuple Q is obtained. Data obtained in the inverse conversion of the multivariable polynomial tuple Q is separated into hushing data D' and random data R'. Then, data D' and D" are compared and forgery is checked.