Industrial Technology Research Institute

Hsia-Hsin Li

Rong-Hong Jan

Chien Sheng Chen

Chih-Che Lin

Pei-Chuan Tsai

Huei-Ru Tseng

Kai-Yun Ho

Kang-Chiao Lin

Ho-Wei Tsai

Je-Wei Chang

Embodiments of the present invention are directed to methods and systems for generating and revoking, as well as validating, certificates used to protect communications within networks while maintaining privacy protection. In the context of a method, certificate generation and revocation with privacy preservation comprises determining a secret value to be used by a certificate authority and an entity; constructing a key tree based on the secret value, wherein the leaves of the key tree represent derived keys for the certificates for the entity; and generating certificates for the entity based in part on the key tree leaves. The method further comprises determining that one or more of the certificates should be revoked; determining a minimum key node set that covers the certificates to be revoked; adding the minimum key node set to a certificate revocation list; and providing the certificate revocation list to one or more entities. Corresponding apparatuses and computer program products are also provided.

Method for certificate generation and revocation with privacy preservation

A method for switching service channels in a vehicular environment is provided for performing communications between a user unit and a service provider unit according to a switch ratio between a service channel and a control channel in a multi-channel switching wireless communication environment. The method includes the following steps. In response to a message indicating that the service provider unit uses an access mode of an extended service channel, whether information of the switch ratio is stored in service information of the user unit is searched in the user unit according to geographical information of the service provider unit. If the information of the switch ratio is stored in the service information of the user unit in the searching step, the user unit is set accordingly to enter the access mode of the extended service channel.

Method and system for providing service channel in a vehicular environment, method and system for switching service channel, and computer readable medium

A fleet maintenance method for generating a suggested speed for each vehicle in a fleet to maintain the vehicle in the fleet is provided. In the fleet maintenance method, vehicles are clustered into a plurality of sub-fleets, and in each sub-fleet, one vehicle is selected as a leader vehicle and the other vehicles are considered as member vehicles. Besides, a position coordinate and a speed of each vehicle in each sub-fleet are obtained, and the position coordinate is converted into a corresponding linear coordinate. In addition, a sub-fleet gravity center of each sub-fleet and a fleet gravity center of the entire fleet are calculated according to the linear coordinates. Moreover, a suggested speed of each leader vehicle is generated according to a gravity center distance of the leader vehicle, and a suggested speed of each member vehicle is generated.

Fleet maintenance method and in-vehicle communication system

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Hsinchu, Taiwan

Hsia-Hsin Li