Research On Attribute-based Encryption For Access Control Of Video Surveillance

In recent years,the Internet technology has been developed rapidly,and the information interaction between people is becoming more and more frequent.More and more people share with others through video.However,the behavior of capturing video streams through video cameras and then sharing is very likely to cause personal privacy leakage.Most sharers do not want their shared content to be obtained by unauthorized people.Recently,the incidents in which some webcams infringe on personal privacy also push the issue of protecting personal privacy to the cusp.Although the traditional access control model can solve the above problems to a certain extent,it cannot solve the access control problem under the situation of data ownership and control separation in the Internet and cloud computing environments.Therefore,in view of the privacy protection problems of video surveillance and the shortcomings of traditional access control models,this paper adopts the way of attribute-based encryption to achieve access control for video surveillance.The main research contents include the following three aspects:(1)For the application scenario of video surveillance access control,the ciphertext policy attribute encryption(CP-ABE)scheme is selected as the key management mechanism,and two typical ciphertext policy attribute encryption schemes are compared in terms of security and efficiency.In comparison,the Brent Waters CP-ABE solution was selected.In view of the fact that the security assumption of the Brent Waters solution is too strong for practical applications and the disadvantage of low decryption efficiency when the number of attributes is large,an improved encryption scheme is introduced and then applied to the access control of video surveillance.(2)For the problem of low efficiency compared with attribute-based encryption and symmetric encryption technology,we combine attribute encryption with stream encryption algorithm,encapsulate the stream encryption algorithm key with attribute-based encryption,and encrypt the video stream with the stream encryption algorithm key.Then,introduce the algorithm from the access structure to the linear secret sharing matrix,and at the same time give the overall design of the system module,system architecture and system related database.Aiming at the high efficiency of real-time video streaming for encryption and decryption,an indirect property revocation method was designed.(3)Set up an Nginx+Rtmp server to implement the corresponding functions of the background server of the system.At the same time,the code implementation of the algorithm from the access structure to the linear secret sharing matrix and the four important algorithms of initialization,key generation,encryption,and decryption in the ciphertext policy attributebased encryption scheme is completed.Then,build a test environment to test the efficiency of the system,and give the corresponding test results.By comparing the decryption efficiency of the scheme before and after optimization,it is indicated that the optimized scheme has a great improvement in decryption efficiency when the number of attributes is large.The system researched and developmented above can be applied to video surveillance,and plays a very important role in the protection of users' privacy.