Information processing apparatus and method, recording medium and program

An electronic device comprising:

• means for generating a secret key shared between the electronic device and another electronic device;
• means for outputting a first response request, which is transmitted to the another electronic device using Transmission Control Protocol (TCP), the first response request generated based on the secret key and a first random number;
• means for receiving a first response message based on the first response request, the first response message transmitted from the another electronic device and including first authentication data based on the secret key and the first random number;
• means for outputting a second response request using TCP, which is transmitted to the another electronic device, after receiving the first response message, the second response request generated based on the secret key and a second random number;
• means for counting a time elapsed from transmitting the second response request;
• means for receiving a second response message based on the second response request, the second response message transmitted from the another electronic device and including second authentication data generated at the another electronic device based on the secret key and the second random number;
• means for comparing the second authentication data included in the second response message with expected authentication information generated by the electronic device based on the secret key;
• and
• means for determining that authentication of the another electronic device has failed when the comparison result indicates that the second authentication data and the expected authentication data do not match or when a predetermined time elapsed from transmitting the second response request expires before the second response message is received.

A method performed by an electronic device, the method comprising:

• generating a secret key shared between the electronic device and another electronic device;
• outputting a first response request, which is transmitted to the another electronic device using Transmission Control Protocol (TCP), the first response request generated based on the secret key and a first random number;
• receiving a first response message based on the first response request, the first response message transmitted from the another electronic device and including first authentication data based on the secret key and the first random number;
• outputting a second response request using TCP, which is transmitted to the another electronic device, after receiving the first response message, the second response request generated based on the secret key and a second random number;
• counting a time elapsed from transmitting the second response request;
• receiving a second response message based on the second response request, the second response message transmitted from the another electronic device and including second authentication data generated at the another electronic device based on the secret key and the second random number;
• comparing the second authentication data included in the second response message with expected authentication information generated by the electronic device based on the secret key;
• and
• determining that authentication of the another electronic device has failed when the comparison result indicates that the second authentication data and the expected authentication data do not match or when a predetermined time elapsed from transmitting the second response request expires before the second response message is received.

A non-transitory computer-readable medium including computer-program instructions, which when executed by an electronic device, cause the electronic device to:

• generate a secret key shared between the electronic device and another electronic device;
• output a first response request, which is transmitted to the another electronic device using Transmission Control Protocol (TCP), the first response request generated based on the secret key and a first random number;
• receive a first response message based on the first response request, the first response message transmitted from the another electronic device and including first authentication data based on the secret key and the first random number;
• output a second response request using TCP, which is transmitted to the another electronic device, after receiving the first response message, the second response request generated based on the secret key and a second random number;
• count a time elapsed from transmitting the second response request;
• receive a second response message based on the second response request, the second response message transmitted from the another electronic device and including second authentication data generated at the another electronic device based on the secret key and the second random number;
• compare the second authentication data included in the second response message with expected authentication information generated by the electronic device based on the secret key;
• and
• determine that authentication of the another electronic device has failed when the comparison result indicates that the second authentication data and the expected authentication data do not match or when a predetermined time elapsed from transmitting the second response request expires before the second response message is received.