The Research And Implementation Of Mobile Phone Short Message Security System Based On Android Platform

With the rapid development of mobile communication,mobile phone short message service,which is powerful and flexible,is applied in many fields.The number of Android intelligent mobile phone users increases rapidly,some criminals steal private information to fraud mobile users by intercepting wildly used SMS(Short Message System),which makes great economic losses.Therefore,it is urgent to solve the security problem of mobile phone text messages.Many experts and scholars have put forward a lot of research projects and achieved a lot of research results,but the encryption system and the encryption key management need to be further improved.Therefore,to further shorten the time of encryption and improve the security of key management,is still the focus of research.The main work of this paper is as follows:(1)In order to solve the security problems of mobile phone short message transmission,a hybrid cryptosystem is proposed.The advanced encryption standard(Advanced Encryption Standard,AES)is used to encrypt the content of the message,and the experiment is carried out to verify the encryption efficiency.In order to ensure the security of the encryption key,the AES encryption algorithm is used to solve the security problem of the AES key.The secure hash algorithm(Secure Hash Algorithm,SHA)is used to verify the integrity of received messages.(2)The secret key management mechanism of private short message encryption system is designed.Faced with key security of the hybrid key system in this paper,we design a public key management system based on the hierarchical management of the elliptic curve encryption algorithm,the public key,the system improves the security of key management,automated key management implementation.Aiming at the safety problem of Android mobile phone SMS encryption key,the key mechanism for file storage warehouse AES algorithm based key management,can prevent illegal user key storage file is derived,to ensure the security of the key,so that the whole secret SMS security encryption system is improved.(3)Using the client / server system architecture,the private SMS encryption system based on Android platform is implemented.The interactive protocol key management server and mobile phone terminal,solve the private messages sending and receiving key encryption transmission problems,and the problems between the mobile phone terminal and key management server information exchange,key update.The mobile client include the function of sending and receiving short messages,the management of friends,and the storage of key,and it provides users with a friendly interface.