Traceable Attribute-Based Encryption on OBDD Access Structure from Lattice

In order to solve the problem of key abuse in attribute-based encryption, a traceable ciphertext-policy attribute-based encryption scheme is proposed based on the learning with error over ring and the ordered binary decision diagram structure. Firstly, the specific information of the user is embedded in each private key to realize the traceability of the key. Secondly, the access of illegal users and malicious users is avoided by maintaining the white list. In addition, the scheme adopts the access structure of ordered binary decision diagram, and increases the positive and negative values of attributes on the basis of supporting the operation of “AND”, “OR” and “Threshold”. Finally, through analysis, the scheme meets the security of anti-collusion attack and chosen-plaintext attack security, reduces the storage and computing overhead, and is more practical than other schemes.