Patent ID: 7131002

Claim:
An authentication method for authenticating a legitimacy of a user of a first module by using a portable first module and a second module capable of communicating with said first module, comprising the steps of: carrying out authentication processing by using first data input to said first module at an electronic circuit having a hardware configuration corresponding to predetermined authentication processing provided in said first module; carrying out said authentication processing by using second data corresponding to said first module having said second module; comparing a result of said processing of said first module with the result of said processing of said second module to authenticate the legitimacy of the user of said first module, wherein the electronic circuit performs a calculation in carrying out said authentication processing, is realized by hardware, rather than software, and has a unique circuit configuration provided for each said first module; generating third data by one module between said first module and said second module; transmitting said generated third data from said one module to the other module; carrying out said authentication processing by using said first data and said third data by said first module; and carrying out said authentication processing by using said second data and said third data by said second module, wherein the calculation performed by the electronic circuit in carrying out said authentication processing comprises a function that defines a logistic mapping based upon said first data and said third data.