Ciphertext-Policy Attribute-Based Encryption Against Post-challenge Continuous Auxiliary Inputs Leakage

Yuyan Guo ； Zhenhua Lu ； Mingming Jiang ； Dongbing Zhang

《International Journal of Network Security》 24卷3期 (2022/05) Pp. 511-520

https://doi.org/10.6633/IJNS.202205_24(3).14

摘要

Leakage-resilient attribute-based encryption (ABE) is widely used because it not only ensures data security but also enables fine-grained access. However, most leak-resistant ABE schemes consider only continuous and auxiliary input leakage models and are not concerned with post-challenge leakage. We propose a security model for post-challenge continuous auxiliary input (pCAI) leakage by combining the post-challenge leakage model with the continuous leakage model and the auxiliary input leakage model. Moreover, we propose a CP-ABE scheme that can protect against the continuous leakage of the secret user key and masters private key and the post-challenge leakage. The security of the proposed scheme is proved under the assumption of composite order bilinear group using dual-system encryption technology. At last, the scheme is proved to be effective through performance comparison with other schemes.

關鍵字

Ciphertext-Policy Attribute-Based Encryption ； Dual System Encryption ； Linear Secret Sharing Scheme ； Post-Challenge Continuous Auxiliary Inputs Leakage