Fuzzy Identity-Based Threshold Key-Insulated Encryption with Ciphertext Policy
Jianhong Chen · Proceedings of the 2018 7th International Conference on Energy and Environmental Protection (ICEEP 2018) · 2018
To solve the signing key exposure problem in fuzzy identity-based encryption systems with ciphertext policy, we propose a fuzzy identity-based threshold key-insulated encryption scheme with ciphertext policy (FIBTKIE-CP) which is provably secure.Our scheme is key-insulated and strongly key-insulated.Even if temporary private keys for up to N-1 time periods are compromised, an adversary is still unable to obtain this user's temporary private key from the remaining time period.Even if up to k -1 helpers are exposed and all temporary private keys are compromised, the adversary still can not harm the security of the non-exposed periods..