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Preserving the privacy of electronic medical records (EMRs) is extremely important especially when medical systems adopt cloud services to store patients’ electronic medical records. Considering both the privacy and the utilization of EMRs, some medical systems apply searchable encryption to encrypt EMRs and enable authorized users to search over these(More)
Revocable hierarchical identity-based encryption (RHIBE) is a good candidate encryption for secure wireless communications. Its dynamic user management through the hierarchical key generation and revocation is efficient. Most existing RHIBEs are bounded which have to fix the maximum hierarchical depth of users at setup. In this paper, we propose the first(More)
The Hierarchical Identity-Based Encryption (HIBE) scheme can efficiently provide confidential communication and privacy protection to online social networks. However, the inherent key escrow problem and the secure key distributing problem primarily hinder the widespread adoption of the cryptographic scheme in practice. To address the key escrow problem,(More)