Ciphertext-Auditable Identity-Based Encryption

Threshold Identity Based Encryption Scheme without Random Oracles

The first threshold identity-based encryption scheme secure against chosen identity and ciphertext attacks is proposed in this paper. Our construction is based on the recently proposed identity-based encryption scheme of Waters in EUROCRYPT 2005. The new threshold identity-based encryption scheme is non-interactive and does not rely on the random oracle model.

On the Security of An Identity Based Broadcast Encryption Scheme

Recently, Ren and Gu proposed a new identity-based broadcast encryption scheme, and claimed that their scheme is secure against chosen-ciphertext attack in the standard model. However, by giving a concrete attack, we indicate that Ren and Gu’s scheme is even not secure against chosen-plaintext attack. Keywordsidentity based broadcast encryption, chosen-ciphertext attack, chosen-plaintext attack...

Chosen-ciphertext secure multi-hop identity-based conditional proxy re-encryption with constant-size ciphertexts

Identity-Based Encryption from the Weil Pairing

We propose a fully functional identity-based encryption scheme (IBE). The scheme has chosen ciphertext security in the random oracle model assuming a variant of the computational DiffieHellman problem. Our system is based on bilinear maps between groups. The Weil pairing on elliptic curves is an example of such a map. We give precise definitions for secure identity based encryption schemes and ...

Direct Chosen-Ciphertext Secure Identity-Based Key Encapsulation Without Random Oracles

We describe a new and practical identity-based key encapsulation mechanism that is secure in the standard model against chosen-ciphertext (CCA2) attacks. Since our construction is direct and not based on hierarchical identity-based encryption, it is more efficient than all previously proposed schemes. Furthermore, we give the first chosen-ciphertext secure identity-based key encapsulation mecha...