Huang Kaizhi

Secret key generation scheme based on MIMO received signal spaces}{Secret key generation scheme based on MIMO received signal spaces

Conventional secret key generation scheme cannot achieve high key generation rate when the channel characteristics change slowly. To solve this problem, a secret key generation model based on the MIMO received signal space is investigated in this paper. In this model, the legitimate transmitter and receiver distill secret keys from the received signal space, and improve the randomness of the received signals by controlling the variance of the transmitted signals, so that the update of the secret key is independent of the time variance of the wireless channel. Then a specific key generation scheme is proposed, in which the legitimate nodes can obtain the same received signal space, from which common vectors can be selected to distill the keys. In addition, an optimal power allocation method to maximize the key rate is presented. The results of the simulation confirm the effectiveness of this scheme.

Physical-layer authentication and key distribution mechanism based on equivalent channel

The authentication of transmitting terminal in present physical-layer security method based on wireless channel character is implemented by checking the pilot signal sent by it, and missing detection often happens. A new kind of physical-layer authentication and key distribution mechanism based on equivalent channel is presented. The equivalent channel is built by encrypting keys with channel character of multi time slots, as a result difference of different channels is mapped onto transmitting distortion. And mutual information of delivering and receiving terminals channel characters can be told by correctness of the transmission, thus the key distribution and authentication are implemented at the same time. Analysis and simulation reveal that key distribution performance in this method is same as the existing one, and the attack can be recognized in circumstances of channels with strong correlation.

Research on the Identity in Heterogeneous Wireless Integrated Networks

Through analyzing the factors affecting software trustworthy, established the index system of trustworthy software estimation. Apply Analytic Hierarchy Process (AHP) to determine the relative importance of factors and indicator items affecting software trustworthy, and then determine the score of estimation index system through fuzzy estimation model, use the combination of both to measure software trustworthy. Finally, this paper presents an example to validate the validity and objectivity of this model.