In this paper, we construct an efficient "multi-receiver identity-based encryption scheme". Our scheme only needs one (or none if precomputed and provided as a public parameter) pairing computation to encrypt a single message for n receivers, in contrast to the simple construction that re-encrypts a message n times using Boneh and Franklin's identity-based encryption scheme, considered previously in the literature. We extend our scheme to give adaptive chosen ciphertext security. We support both schemes with security proofs under precisely defined formal security model. Finally, we discuss how our scheme can lead to a highly efficient public key broadcast encryption scheme based on the "subset-cover" framework.
Baek, Safavi-Naini and Susilo proposed an efficient multi-receiver identity-based encryption scheme REF in multi-cast encryption applications.
Efficient Multi-receiver Identity-Based Encryption and Its Application to Broadcast Encryption
Public Key Cryptography
Computer Science