Research And Implementation Of Mobile Terminal Document Security Management Based On Attribute Encryption

With the development of mobile communication technology and the popularity of intelligent terminals,people are gradually moving towards more efficient and speed mobile office era,especially after the cloud service model matures,many enterprises choose to store electronic documents in the cloud service.As long as the network,through the mobile terminal equipment,you can timely access the documents,to complete the reading approval,file sharing and other operations.However,the mobile office in greatly improve the efficiency of electronic documents at the same time,there are many hidden leaks in the use,storage,distribution and other aspects,mainly as follows:file distributed storage,terminal management is imperfect,the lack of fine-grained access control,document transmission in lack of effective measures such as encryption.In particular,cloud storage service providers as third parties are not entirely credible,but most of the mobile terminal security office system on the market usually do not have enough attention to the security of documents,such as word,pdf,which usually contain important information..In this paper,we focus on two application scenarios: fine-grained access control and secure sharing.On the one hand,a key concealment based on attribute encryption scheme is proposed,which supports the access control strategy described by LSSS matrix.It is more flexible.In the system initialization and the key generation stage,we use three key center to generate data,which reducing the risk of key leakage;in order to reduce the computational complexity to decrypt the user,decryption phase is divided into two parts,first by the proxy server to complete outsourcing in decryption by the mobile terminal;at the same time,through the proxy server to complete the visit Strategy update operation,to avoid the traditional download and then update the cumbersome operation.On the other hand,this paper introduces the idea of on-line/off-line signcryption,which ensures the confidentiality and non forgery of documents sharing among users.