Information processing apparatus and method, recording medium and program

An electronic device comprising:

• a processor;
• a non-transitory computer-readable medium configured to store computer program instructions which when executed by the processor cause the processor to:
• receive a first response request, the first response request transmitted from a second electronic device using Transmission Control Protocol (TCP) and generated at the second electronic device based on a first random number;
• generate a first response message based on the first response request, the first response message transmitted to the second electronic device and including first authentication data generated based on the first random number;
• receive a second response request, which is transmitted from the second electronic device after the second electronic device receives the first response message, the second response request generated by the second electronic device based on a second random number;
• and
• generate a second response message based on the second response request, the second response message transmitted to the second electronic device and including second authentication data generated based on the second random number, wherein
• the electronic device is permitted to receive data from the second electronic device when the second electronic device determines that the second authentication data matches expected authentication information generated by the second electronic device the second response message is received by the second electronic device before a predetermined time elapsed from transmitting the second response request expires.

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

• output a first response request, which is transmitted to a second electronic device using Transmission Control Protocol (TCP), the first response request is generated based on a first random number;
• receive a first response message based on the first response request, the first response message transmitted from the second electronic device and including first authentication data generated at the second electronic device based on the first random number;
• output a second response request, which is transmitted to the second electronic device using TCP, after receiving the first response message, the second response request generated based on 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 second electronic device and including second authentication data generated at the second electronic device based on the second random number;
• compare the second authentication data included in the second response message with expected authentication data generated by the electronic device;
• and
• judge that the second electronic device is authorized to receive content data from the electronic device when the comparison result indicates that the second authentication data matches the expected authentication data and the second response message is received by the electronic device before a predetermined time elapsed from transmitting the second response request expires.

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

• receive a first response request, the first response request transmitted from a second electronic device and generated at the second electronic device based on a first random number;
• generate a first response message based on the first response request, the first response message transmitted to the second electronic device and including first authentication data generated based on the first random number;
• receive a second response request, which is transmitted from the second electronic device after the second electronic device receives the first response message, the second response request generated by the second electronic device based on a second random number;
• and
• generate a second response message based on the second response request, the second response message transmitted to the second electronic device and including second authentication data generated based on the second random number, wherein
• the electronic device is permitted to receive data from the second electronic device when the second electronic device determines that the second authentication data matches expected authentication information generated by the second electronic device the second response message is received by the second electronic device before a predetermined time elapsed from transmitting the second response request expires.

An information processing system having a non-transitory computer-readable medium and an interface comprising:

• the non-transitory computer-readable medium including computer-program instructions, which when executed by an electronic device, cause the electronic device to:
• output a first response request, which is transmitted to a second electronic device using Transmission Control Protocol (TCP), the first response request generated based on a first random number;
• receive a first response message based on the first response request, the first response message transmitted from the second electronic device and including first authentication data generated at the second electronic device based on the first random number;
• output a second response request, which is transmitted to the second electronic device using TCP, after receiving the first response message, the second response request generated based on 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 second electronic device and including second third authentication data generated at the second electronic device based on the second random number;
• compare the second authentication data included in the second response message with expected authentication data generated by the electronic device;
• and
• judge that the second electronic device is authorized to receive content data from the electronic device when the comparison result indicates that the second authentication data matches the expected authentication data and the second response message is received by the electronic device before a predetermined time elapsed from transmitting the second response request expires.

An information processing system having a non-transitory computer-readable medium and an interface comprising:

• the non-transitory computer-readable medium including computer-program instructions, which when executed by an electronic device, cause the electronic device to:
• receive a first response request, the first response request transmitted from a second electronic device and generated at the second electronic device based on a first random number;
• generate a first response message based on the first response request, the first response message transmitted to the second electronic device and including first authentication data generated based on the first random number;
• receive a second response request, which is transmitted from the second electronic device after the second electronic device receives the first response message, the second response request generated by the second electronic device based on a second random number;
• and
• generate a second response message based on the second response request, the second response message transmitted to the second electronic device and including second authentication data generated based on the second random number, wherein
• the electronic device is permitted to receive data from the second electronic device when the second electronic device determines that the second authentication data matches does not match expected authentication information generated by the second electronic device and the second response message is received by the second electronic device before a predetermined time elapsed from transmitting the second response request expires.