Research On Attribute-based Broadcast Encryption In The Internet Of Things

With the rapid development of Internet of things and cloud computing technology,more and more cloud applications for information services are springing up.It cannot be neglected that huge data security risks exist when using the Io T applications for information transmission,and that the users' dynamic characters make it hard to achieve an efficient way for information transmission.Attribute-Based Broadcast Encryption is a secure and efficient communication encryption technology,which combines the advantages of Broadcast Encryption and Attribute-Based Encryption.It helps to transmit a message to multiple users safely,furthermore,flexible cipher text access control can be implemented in a one-to-many,many-to-many information-sharing Io T environment.However,most of the Attribute-based broadcast encryption schemes up to now are not efficient enough and have many shortcomings,such as the long length of ciphertext,the big number of user private keys,the complicated calculation of encryption and decryption,the inflexible access strategy,and the leakage of user privacy due to the exposure of the access structure.In order to overcome the flaws of the Attribute-Based Broadcast Encryption schemes,the contribution of this paper are two efficient Attribute-Based Broadcast Encryption schemes for Io T environment.Both schemes are suitable for the Io T environment and have different features respectively.The first scheme achieves a fixed-length ciphertext,which is suitable for the Io T applications which sharing information in one-to-many way.The second scheme allowing arbitrary access policies is suitable for the many-to-many Io T application with diverse privacy requirements.The main work of this article is the two following aspects:Firstly,Aiming at the characteristics of limited communication resources,strong dynamic of user,as well as lack of computing resources,this paper designs an Attribute-Based Broadcast Encryption scheme with constant ciphertext length.This scheme is based on Boneh,Gentry and Waters scheme,can achieve efficient revocation function,and using AND-gate with positive?negative values and wildcard symbol to achieve constant length ciphertext,and the access structure could be hidden.We then incorporate a Mediated Attribute-Based Encryption to achieve outsourced storage and outsourced decryption simultaneously.In this way,our scheme can reduce the user's storage and calculation costs effectively.Moreover,through the security analysis and experimental simulation,it is proved that our scheme achieves choose plaintext attack(CPA)security safety.Secondly,in view of the variety of information sources in many-to-many Io T applications,the diversity of user privacy requirements,and the weak user computing power,we propose an Attribute-Based Broadcast Encryption scheme supporting any access policy.This scheme uses the Linear Secret Share Scheme as access structure so that the users can freely develop their own access strategies.In addition,this scheme solves the problem of weak user computing power by introducing the mediator to efficiently reduce the computing scale.At the same time,the scheme realizes the outsource decryption verifiable function based on the idea of decryption verification scheme,which ensures the correctness of the mediator outsourcing work.Moreover,through the security analysis and experimental simulation,it is proved that our scheme achieves choose plaintext attack(CPA)security safety.