Design And Implementation Of Encryption System For Android Platform Based On Transparent Encryption

With the popularization of computers and the large-scale development of Internet technology,the emergence of cloud computing and big data is became a common phenomenon.The emergence,transmission,application and sharing of information takes place in every inch of the internet.This time the information activities that occur in the excited and great productivity in the human society,not only makes human society change rapidly,but also virtually makes the information grow with each passing day in modern society.The mobile terminal equipment of Android under the support of the system has many advantages,namely,transparent encryption,encryption and decryption process of the file system should be "transparent",also isn’t needed to be add additional processing overhead,provide better security protection measures for the user.When hackers or Trojan data attacks or illegal theft,because the encryption layer encrypted information,can be made of transparent encryption system to provide the corresponding service means only for users can decrypt;but due to illegal intruders without the correct decryption information cannot be provided service operation.In this thesis,a transparent encryption based Android platform encryption system is designed and implemented based on transparent encryption technology.The main works of this thesis includes:(1)It is described and analyzed from the point of view of many security problems faced by the Android system,the encryption and decryption of information in the transmission and storage process as the research center of the article and through a large number of literature review,determine the use of stack type file system and FIST language to achieve the mobile terminal equipment in the Android system encryption and decryption operations.(2)The architecture design of encrypted file system based on e Cryptfs and the design of short message encryption system are introduced respectively from the two aspects of SMS protection system model and security conversation protocol,finally,the design of the keyt is introduced.(3)The introduction of transparent encryption system is introduced from two aspects of Android system and vold.Then the encryption implementation of transparent encryption system is introduced from two aspects of encryption of read and write data and implementation of encryption algorithm,finally,the related keyt management is actualized.(4)In this thesis,the Android platform is tested and analyzed,and the Nexus mobile phone developed by Google company is used as the research object to realize the transparent encryption system which is discussed in this paper.Nexus mobile phone has good encryption and decryption operations,and can be added to the third party mirror and kernel functions,which is suitable for the study of this article.This thesis is expounded the influence of two aspects of encryption algorithm and key length on system performance,analyzes the operation effect of short message encryption system,and then evaluates and analyzes the performance of the system.The reliability and feasibility of the scheme are confirmed and the research and implementation of transparent encryption system are completed.