31results about How to "Prove security" patented technology

The invention relates to physical layer information security technology of wireless communication. The invention discloses a system safety performance evaluation method based on FDA camouflage and deception, comprising the following steps: Step 1: taking the carrier frequency of a certain array element of the FDA antenna as the reference carrier frequency, and the carrier frequency of other array elements as the reference carrier frequency Add different frequency offsets on the basis of the carrier frequency, and then transmit the signal carrying information through the FDA antenna; Step 2: The legal user D designs its signal receiver according to the characteristics of the signal transmitter, and performs information analysis on the received signal step 3: eavesdropping user E judges the signal received by its receiver, and uses OFDM signal processing method according to the characteristics of the received signal to demodulate the received signal; step 4: calculate according to step 2 and step 3 respectively The receiving signal-to-noise ratio of legitimate users and eavesdropping users is calculated, and then the safe transmission rate of the system is calculated to evaluate the system security performance. The invention ensures the safe transmission of information.

The application provides an alveolar bone repair material, comprising hydroxyapatite, allyltrimethylammonium chloride or acrylamide-modified chitosan, hydroxypropylmethylcellulose, and BMP-2 polypeptide . The material can be used for alveolar bone restoration and dental implant.

The invention belongs to the field of active protein-containing biomedical materials and the field of regenerative medicine and particularly provides a bone repair material. The bone repair material contains modified chitosan, gelatin and rH-BMP2 (bone morphogenetic protein-2). The material can be used for repairing bone injury. The bone repair material is prepared from the following components inpercentage by mass: 1%-10% of rH-BMP2, 20%-70% of modified chitosan and 20%-70% of gelatin. A tremendous advance is made in degradation / drug release time by using allyltrimethylammonium chloride or acrylamide modified chitosan and gelatin as sustained release carriers, and allergy is reduced substantially. The material has the effects obviously better than those of chitosan and the existing similar materials in in-vitro release tests and animal tests, and safety of the material is proved preliminarily by cytotoxicity tests.

The invention discloses an authentication method based on a smart card in a multi-server environment. According to the authentication method, the participation of a third party in authentication is not needed, a user just needs to register for one time, the smart card only needs to store information of constants, the authentication and access among multiple servers can be realized, a server end also does not need to store any user information, and thus a problem that the information stored by the smart card is increased with the increase of registration servers when no third party participates authentication in the multi-server environment is solved. The security of an authentication model is proved through BAN logic analysis, at the same time performance analysis shows that the authentication scheme of the invention has a low storage cost requirement compared with an existing authentication scheme based on the smart card in the multi-server environment in the condition that computation cost and communication cost do not increase burden significantly.