公开(公告)号：US09800660B2

公开(公告)日：2017-10-24

申请号：US14765158

申请日：2014-01-29

Applicant: Panasonic Intellectual Property Management Co. Ltd.

Inventor： Yoichi Masuda ,  Masaki Ikeda ,  Tomoya Watanabe ,  Keiji Sakaguchi ,  Hirotatsu Shinomiya ,  Seiji Nimura

IPC: H04L29/08 ,  G06F3/06 ,  H04L9/36 ,  H04L9/06 ,  H04L29/06

CPC classification number: H04L67/1097 ,  G06F3/0623 ,  G06F3/0653 ,  G06F3/067 ,  H04L9/0637 ,  H04L9/36 ,  H04L63/0428

Abstract: A communication device according to the present invention aims to restart data transmission/reception between communication devices in a short amount of time, without performing key sharing again, even when a communication device of a transmitting side is rebooted. The communication device includes a volatile memory storing a count value, a generator generating data including a count value, a communicator transmitting data to another communication device, a storage instructor, each time the communicator transmits data, updating the volatile memory with a count value, and a nonvolatile memory. A count value is incremented each time the communicator transmits data, the storage instructor causes the nonvolatile memory to store a count value at certain intervals, and the generator, when the communication device is rebooted, includes in data a sum of a certain value and a count value stored in the nonvolatile memory.