원문정보
초록
영어
In this work, an oblivious transfer with complex access control scheme that is constructed based on ciphertext policy attribute based encryption (CP-ABE) scheme is proposed. In this scheme, the database server can enforce fine grained access control for each record where the authorized user is allowed to access, but the unauthorized user cannot, whereas it learns neither which record a user accesses, nor which attributes a user has. This scheme has the advantages as follows: First, it allows the expressive access control policies where access structures are based on linear secret sharing scheme that directly supports AND, OR and Threshold gates. Second, the communication complexity in this scheme is constant in the numbers of records which have been accessed. Third, this scheme is constructed in prime order bilinear group. Fourth, this scheme is secure in the standard model. To the best of our knowledge, this scheme is the first to obtain these features simultaneously.
목차
1. Introduction
2. Related Work
3. Preliminaries
3.1. Bilinear Map
3.2. Access Structure
3.3. Linear Secret Sharing Scheme
3.4. Complexity Assumptions
3.5. Ciphertext Policy Attribute Based Encryption
3.6. Zero Knowledge Proofs
3.7. Fully Simulatable Oblivious Transfer
4. Definitions
4.1. Scheme Overview
4.2. Scheme Definition
4.3. Definition of Security
5. ConstructionIn this construction,
6. Proof of Security
7. Performance Analysis
8. Conclusion and Future Work
9. Acknowledgements
10. References