Information processing device

Abstract

Abstract PURPOSE:To prevent the access of a third person and to discriminate an unnormal unit by deriving the first and the second operating values by an inputted collating number, obtaining the third and the fourth operating values from a stored collating number to compare them with each other. CONSTITUTION:When an IC containing card 19 is inserted into a master machine, a data signal input/output terminal 28a, etc. are connected, and controlled to a start stage. When a collating number X is inputted from the input use keyboard of the master machine, a random number R is generated, a function S= f(A, X, R) and a function T=g(A, X, R) are operated, and a value of S is transferred to the card 19 side. A is a group number given to a group. When a data transfer of values of R and S is received, the card 19 side executes the operation of a function S'=f(A', X', R) (A' and X' are a group number and a collating number stored in an information storing circuit 22). When the collating number X is correct, S=S' is obtained to use the card subsequently as usual. If the number collation is unsuccessful four times continuously, the storage in the circuit 22 is erased automatically. Also, it is also impossible to use an unnormal master machine.

Inventors

• 👤 Mitsuhiro Murata
• 👤 村田　充裕

Bibliographic Details