China Iwncomm Co., Ltd.

Xi'an Jiaotong University

Ming Li

Zhiqiang Du

Qin Li

Yanan Hu

Xuefeng Chen

Yi Li

Shaohua Tian

Zhibo Yang

Mingfeng Zhu

Xingwu Zhang

The disclosure discloses a Lamb wave phased array focus-imaging method based on a frequency response function. In the method, a piezoelectric sensor array is arranged on a surface of a tested structure, the frequency response function of an excitation and acquisition pair formed by an excitation array element and an acquisition array element is calculated according to a full-band response signal, and a dispersion pre-compensation signal is constructed; the dispersion pre-compensation signal and the frequency response function are multiplied in a frequency domain to obtain a frequency domain pre-compensation response signal; and according to a distance from the acquisition array element to a focal point at the coordinates, the dispersion of the frequency domain pre-compensation response signal is post-compensated, so as to obtain a frequency domain dispersion post-compensation signal until all sensor excitation and acquisition pairs are traversed.

Lamb wave phased array focus-imaging method based on frequency response function

Disclosed are an entity authentication method and device, involving: sending, by an entity A, a first identity authentication message to an entity B; inspecting, by the entity B after receiving the first message, the validity of a certificate of the entity A; sending, by the entity B, a second identity authentication message to the entity A; inspecting, by the entity A after receiving the second message, the correctness of field data therein; calculating, by the entity A, a secret information and message authentication code using a private key thereof and a temporary public key of the entity B, and sending a third message to the entity B; inspecting, by the entity B after receiving the third message, the correctness of field data therein; calculating, by the entity B, a secret information and message authentication code using a private key thereof and a public key of the entity A.

Entity authentication method and device with Elliptic Curve Diffie Hellman (ECDH) key exchange capability

The present invention provides an entity identification method, apparatus and system, and relates to: an entity A transmits an identification request message to an entity B, the identification request message includes the result SNof an XOR operation of a Pre-Shared Key (PSK) and the data from processing data Naccording to a first agreed rule, wherein data Nis generated by entity A, and the PSK is a key shared by A and B; entity B receives the identification request message, performs an XOR operation on SNand PSK, performs a process according to a second agreed rule, then performs a process according to a third agreed rule, and then performs an XOR operation again with the PSK processed according to the third agreed rule and then processed according to a fourth rule to obtain SON, and transmits SONthrough an identification response message to entity A.

Entity identification method, apparatus and system

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Shaanxi, China

Ming Li