An Efficient Generic Insider Secure Signcryption with Non-Interactive Non-Repudiation

We present a generic construction of an insider secure signcryption scheme with non-interactive non-repudiation. Our construction uses as building blocks a signature scheme, a key encapsulation mechanism (KEM), a keyed hash function, a symmetric encryption scheme, and a pseudo-random function. We show that our construction is insider secure in the dynamic multi-user model, without resorting the random oracle or the key registration model. Our generic scheme provides also non-interactive non-repudiation.