- 期刊
Multi-Authority Attribute-based Encryption Resilient against Auxiliary-Input Leakage
摘要
The existing multi-authority Attribute-Based Encryption (ABE) schemes cannot tolerate the secret key leakages under a variety of side-channel attacks. We integrate the auxiliary-input leakage model with dual system encryption technique, and reasonably design the generations of secret key and ciphertext, then propose a multi-authority attribute-based encryption resilient against auxiliary-input leakage. Based on the modified Goldreich-Levin theorem and the subgroup decision problem assumptions, we prove our scheme to be fully secure even if the adversary can obtain the leakages on attribute-based private keys with the auxiliary input functions. Compared with the relative leakage-resilient ABE schemes, our scheme not only achieves numeric unbounded leakages on the attribute-based private key of users, but also support the multi-authority application scenarios. Therefore, our scheme can effectively resist a larger possible class of potential attackers in the decentralizing multi-authority ABE systems.