Unified Public Key Infrastructure Supporting Both Certificate-Based and ID-Based Cryptography

Certificate-based cryptography and ID-based cryptography have been designed under different theoretical backgrounds and they have their own advantages and drawbacks, but there have been few works which try to provide them together in an efficient way. Chen et al. considered a hybrid scheme of public key infrastructure (PKI) and ID-based encryption (IBE), and also discussed various trust relationship among multiple authorities, but they have not...