Efficient and Identity-based Signcryption with Provably-secure

The idea of signcryption is to provide a method to encrypt and sign data together, so it is more efficient than using an encryption scheme combined with a signature scheme. We present an identitybased signcryption solution, which is one of the most efficient, provably-secure schemes proposed to date. Our scheme admits provable security in the random oracle model under the bilinear DiffieHellman assumption using the definitions proposed by Boyen and it is also forward secure.