公开(公告)号：US20190165933A1

公开(公告)日：2019-05-30

申请号：US16146794

申请日：2018-09-28

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Satoru TOMISAWA ,  Yoshihiro HAYASHI ,  Yuichi MARUYAMA ,  Hideyuki WAKADA

IPC: H04L9/08

Abstract: A secure communication system is provided, in which a common cryptographic key is generated using the biological information simultaneously acquirable by multiple communication devices. The communication system includes multiple separated communication devices. The communication device generates the same common key based on the feature element of simultaneously acquirable biological information, and performs encryption and decryption using the common key. The communication device includes a biological information acquiring unit to acquire the feature element of the biological information; a common key generation unit to generate the common key; an encryption/decryption unit to encrypt transmit information and to decrypt receive information with the common key; and a communication unit to receive the transmit information and to transmit the receive information.

公开(公告)号：US20180352434A1

公开(公告)日：2018-12-06

申请号：US15955831

申请日：2018-04-18

Applicant: Renesas Electronics Corporation

Inventor： Tomohiko OHTSU ,  Shinichi YAMADA ,  Yuichi MARUYAMA ,  Hideyuki WAKADA ,  Yoshihiro HAYASHI ,  Taku FUJIWARA

IPC: H04W12/06 ,  H04L29/06

Abstract: Provided is a technology for a technology for easily inhibiting a wireless signal from being spoofed. A wireless communication system includes a beacon device and an information processing terminal. The beacon device includes a first communication circuit for transmitting a beacon signal to the information processing terminal in accordance with a predetermined transmission interval pattern. The information processing terminal includes a second communication circuit, a first storage device, and a control device. The second communication circuit receives the beacon signal from the beacon device. The first storage device stores the predetermined transmission interval pattern. The control device authenticates the beacon device by comparing a reception interval pattern of the beacon signal received by the second communication circuit with the predetermined transmission interval pattern stored in the first storage device.

公开(公告)号：US20180368085A1

公开(公告)日：2018-12-20

申请号：US15960804

申请日：2018-04-24

Applicant: Renesas Electronics Corporation

Inventor： Taku FUJIWARA ,  Yuichi MARUYAMA

IPC: H04W56/00 ,  H04L12/26

Abstract: A first device of a wireless synchronization system includes: a first sensor for measuring a physical quantity related to power consumed by wireless communication process of a first communication circuit; and a first control circuit outputting a first synchronization signal at a timing that the magnitude relation between the physical quantity measured by the first sensor with respect to one of transmitting process and receiving process in the wireless communication process and a predetermined threshold value changes. A second device includes a second control circuit outputting a second synchronization signal at a timing that the magnitude relation between the physical quantity measured by the second sensor with respect to the other one of the transmitting and receiving processes in the wireless communication process in a second communication circuit and a predetermined threshold value changes.

公开(公告)号：US20180358973A1

公开(公告)日：2018-12-13

申请号：US15950968

申请日：2018-04-11

Applicant: Renesas Electronics Corporation

Inventor： Yuichi MARUYAMA ,  Noriaki MATSUNO

IPC: H03L7/099 ,  H03K3/53 ,  H03L1/02

CPC classification number: H03L7/099 ,  H03B5/04 ,  H03B5/366 ,  H03B2200/005 ,  H03B2200/0068 ,  H03B2201/0266 ,  H03K3/53 ,  H03L1/026 ,  H03L1/027 ,  H03L1/028

Abstract: Increases of circuit scale and power consumption are suppressed while frequency deviation is kept within a predetermined allowable range. A semiconductor device according to an embodiment includes a variable load capacity circuit including a plurality of load capacity elements coupled in parallel to one end of a crystal resonator and a plurality of switches that are respectively serially coupled to the load capacity elements, and a switch control unit that controls ON/OFF of the switches on the basis of information to be an index of frequency deviation due to temperature change of a frequency signal obtained by oscillating the crystal resonator. The switch control unit changes the number of switches that will be turned ON among the plurality of switches so that an absolute value of the frequency deviation becomes small when the information is not included in a predetermined allowable range.