A Novel Construction of Updatable Identity-Based Hash Proof System and Its Applications

In the previous works, to further provide continuous leakage resilience for identity-based encryption scheme, a new cryptography primitive, called updatable hash proof system (U-IB-HPS), was proposed. However, most of existing constructions have some deficiencies, they either do not perfect key update function or corresponding security with tight reduction relies on non-static complexity assumption. To address above problems, construction U-IB-HPS is created, and our proved based static Also, comparisons analysis performances show that proposal only achieves anonymity, but also has reduction. additional, same computational efficiency as other systems. illustrate practical U-IB-HPS, generic method non-interactive data authorization protocol designed by employing an underlying tool, which can leakage-resilient cloud computing. Hence, application field extended through study.