Efficient Anonymous Ciphertext-Policy Attribute-based Encryption for General Structures Supporting Leakage-Resilience

Xiaoxu Gao ； Leyou Zhang

《International Journal of Network Security》 22卷5期 (2020/09) Pp. 763-774

https://doi.org/10.6633/IJNS.202009_22(5).06

摘要

The traditional cryptographic schemes cannot guarantee data security and users privacy under the side-channel attacks. Additionally, most of the existing leakage-resilient schemes cannot protect the privacy of the receivers. To achieve the leakage resilience and privacy-preserving, two anonymous attribute-based encryption (ABE) schemes for general access structures are proposed. In the first scheme, the access structure is encoded as minimal sets which provide the higher efficiency in the cost of decryption algorithm. Then we show how to obtain an anonymous leakage-resilient ABE for non-monotone access structures. Both schemes can tolerate the continual leakage when an update algorithm is employed in the event of the occurrence of the leakage information beyond the allowable leakage bound. They are proven to be adaptively secure in the standard model under four static assumptions over composite order bilinear group. The performance analyses confirm efficiency of our schemes.

關鍵字

Anonymous ； Attribute-based Encryption ； Ciphertext-Policy ； Leakage-Resilience