Mutual authentication system and method

Claim 2

A mutual authentication system for authenticating a first electronic device and a second electronic device by transmitting authentication data between the first and second electronic devices, comprising: first transmission means for transmitting a first authentication data from the second electronic device to the first electronic device; determination means provided in the first electronic device for determining the legitimacy of the second electronic device based on the first authentication data transmitted from the second electronic device; second transmission means for transmitting a second authentication data, which is used for determining the legitimacy of the first electronic device, from the first electronic device to the second electronic device; and inhibition means for inhibiting the operation of the second transmission means when the second electronic device is not determined to be legitimate by the determination means.

Claim 3

A mutal authentication system as in claim 1, wherein the first electronic device includes a portable electronic device having a contact section for electrically communicating with the second electronic device.

Claim 4

A mutal authentication system as in claim 2, wherein the second electronic device includes a terminal device for electrically communicating with the portable electronic device.

Claim 5

A mutual authentication system as in claim 1, wherein the first transmission means comprises a card reader/writer in the second electronic device which communicates with a contact section in the first electronic device.

Claim 6

A mutual authentication system as in claim 1, wherein the determination means includes means for comparing the first authentication data with data stored in the first electronic device.

Claim 7

A mutual authentication method for authenticating a first electronic device and a second electronic device by transmitting authentication data between the first and second electronic devices, comprising the steps of: transmitting a first authentication data from the second electronic device to the first electronic device; determining the legitimacy of the second electronic device based on the first authentication data transmitted from the second electronic device; transmitting a second authentication data, which is used for determining the legitimacy ofthe first electronic device, from the first electronic device to the second electronic device; and inhibiting the transmitting of the second authentication data when the second electronic device is not determined to be legitimate by the determining step.

Claim 8

A mutual authentication method for authenticating a first electronic device and a second electronic device by transmitting authentication data between the first and second electronic devices, comprising the steps of: transmitting a first authentication data from the second electronic device to the first electronic device; determining the legitimacy of the second electronic device based on the first authentication data transmitted from the second electronic device; transmitting a second authentication data, which is used for determining the legitimacy ofthe first electronic device, from the first electronic device to the second electronic device; and inhibiting the transmitting of the second authentication data when the second electronic device is not determined to be legitimate by the determining step.

Claim 9

A mutual authentication method as in claim 6, wherein the step of determining the legitimacy of the second electronic device inlcudes comparing the first authentication data with data stored in the first electronic device.

Claim 10

A mutual authentication method as in claim 6, wherein the step of inhibiting includes sending an indicaiton from the first electronic device to the second electronic device when the second electronic device is determined not to be legitimate.

Claim 11

A mutual authentication method for transmitting authentication data between first and second electronic devices for authenticating with each other, comprising the steps of: transmitting first data and first designate data designating first key data to the first electronic device from the second electronic device; transmitting second data and second designate data designating second key data to the second electronic device from the first electronic device; generating first authentication data based on the second data and the second key data in the first electronic device; generating second authentication data based on the received second data and the second key data designated by the second designate data in the second electronic device; comparing the first authentication data with the second authentication data transmitted from the second electronic device in the first electronic device; generating third authentication data bases on the first data and the first key data designated by the first designate data in the first electronic device; and transmitting the third authenticatication data from the first electronic device to the second electronic device when the first authentication data coincides with the second authentication data in the comparing step.

Claim 12

A mutual authentication method for transmitting authentication data between first and second electronic devices for authenticating with each other, comprising the steps of: transmitting first data and first designate data designating first key data to the first electronic device from the second electronic device; transmitting second data and second designate data designating second key data to the second electronic device from the first electronic device; generating first authentication data based on the second data and the second key data in the first electronic device; generating second authentication data based on the received second data and the second key data designated by the second designate data in the second electronic device; comparing the first authentication data with the second authentication data transmitted from the second electronic device in the first electronic device; generating third authentication data bases on the first data and the first key data designated by the first designate data in the first electronic device; and transmitting the third authenticatication data from the first electronic device to the second electronic device when the first authentication data coincides with the second authentication data in the comparing step.

Claim 13

A mutual authenticaiton method as in claim 9, wherein the first electronic device includes storing means having memory areas divided corresponding to application objects thereof for storing key data corresponding to the divided areas.

Claim 14

A mutual authenticaiton method as in claim 10, further comprises a step of controlling reading and writing operations with respect to the divided areas of the storing means based on a comprari- son result of the comparing step.

Claim 15

A mutual authenticaiton method as in claim 10, wherein the storing means stores first key data and second key data into the each of memory areas.