Telecommunications apparatus and method, storage medium, and program

摘要

The present invention relates to a telecommunications apparatus and a method, a storage medium, and a program for determining whether or not an other side communicating apparatus is near in a network. In a transmitting apparatus, a transmitting unit transmits a sending-message, and a control unit receives a response message to the sending-message, which includes acknowledgement information based on shared data and transmission information in the sending-message. The transmitting apparatus also includes a first judging unit that judges whether a response time of the acknowledgement message is less than a predetermined time. A receiving apparatus includes a generating unit that generates the acknowledgment information and transmits the response message to the transmitting apparatus.

主权项

1. An electronic device comprising:
circuitry configured to
receive a check packet transmitted from another electronic device using Transmission Control Protocol (TCP), the check packet including a random number that is different from random numbers included in other check packets transmitted from the another electronic device;generate a TCP acknowledgment message to the check packet, the TCP acknowledgment message including acknowledgment information based on a key shared with the another electronic device before the check packet is received; andoutput the TCP acknowledgment message to the another electronic device, wherein the electronic device is authorized to receive data from the another electronic device when a comparison result, the result generated based on the acknowledgement information and expected acknowledged information computed based on the key at the another electronic device, indicates that the acknowledgment information and the expected acknowledgment information match and the TCP acknowledgment message is received at the another electronic device before a predetermined time elapsed from transmitting the check packet expires, and at least one of the acknowledgement information and expected acknowledgement information is generated using a hash function.