Patent ID: 8386647

Claim:
A method for time source calibration, wherein said method comprises steps of sending a requirement for obtaining time by a client side computer to a server side; sending a first data packet including time and verification information generated by the server side to a key device via the client side computer; said time is the current time of the server side; calibrating the time of the key device via a clock calibrating module in the key device with the obtained current time of the server side as benchmark time and counting time normally by the key device via a clock module in the key device; sending a second data packet including calibrated current time of the key device and the verification information by the key device via a communication module of the key device to the server side via the client side computer; and obtaining the current time of the key device in the second data packet by the server side after the verification information in the second data packet is verified to be valid by the server side, wherein in the step that the verification information in the second data packet is verified to be valid by the server side, the verification information is deemed as valid when the verification information in the second data packet accords with the verification information generated by the server side.