Patent ID: 8732463

Claim:
A data transmitting apparatus for communicating with a destination device, the destination device performing an authentication process based on an authenticator, the data transmitting apparatus comprising: an authenticator generating unit configured to generate a first authenticator by using a first encryption key and generate a second authenticator by using a second encryption key, divide the second authenticator into first to n-th (n is an integer greater than or equal to 2) fragment information items, select the first fragment information item out of the first to n-th fragment information items and generate a first packet including both of the first authenticator and the first fragment information item; and a communicating unit configured to transmit the first packet to the destination device, wherein, if a response indicating success of the authentication process based on the first authenticator is not received from the destination device within a certain period after the first packet is transmitted, the authenticator generating unit selects each one of the second to the n-th fragment information items and generates second to n-th packets each including a respective one of the second to n-th fragment information items, and the communicating unit sequentially transmits the second to n-th packets to the destination device.