Forward-Secure Hierarchical Predicate Encryption

Forward-Secure Hierarchical Predicate Encryption

Secrecy of decryption keys is an important pre-requisite for security of any encryption scheme and compromised private keys must be immediately replaced. Forward Security (FS), introduced to Public Key Encryption (PKE) by Canetti, Halevi, and Katz (Eurocrypt 2003), reduces damage from compromised keys by guaranteeing confidentiality of messages that were encrypted prior to the compromise event....

Forward-Secure Hierarchical IBE with Applications to Broadcast Encryption

A forward-secure encryption scheme protects secret keys from exposure by evolving the keys with time. Forward security has several unique requirements in hierarchical identity-based encryption (HIBE) scheme: (1) users join dynamically; (2) encryption is joining-time-oblivious; (3) users evolve secret keys autonomously. We define and construct a scalable pairing-based forward-secure HIBE (fsHIBE...

Forward-Secure Distributed Encryption

Distributed encryption is a cryptographic primitive that implements revocable privacy. The primitive allows a recipient of a message to decrypt it only if enough senders encrypted that same message. We present a new distributed encryption scheme that is simpler than the previous solution by Hoepman and Galindo—in particular it does not rely on pairings—and that satisfies stronger security requi...

Constructions of Fully Secure Predicate Encryption Schemes

Fully Secure Predicate - based Broadcast Encryption ?

According to the broadcast encryption scheme with wide applications in the real world, a fully secure predicate-based broadcast encryption was proposed by combining with Waters dual system encryption, predicate encryption and the orthogonality property of composite-order bilinear groups. Based on the standard model, the scheme can achieve constant-size key and ciphertext, and guarantee the secu...