分野別セミナー

Hybrid signcryption is an important technique signcrypting bulk data using symmetric encryption. In this paper, we apply the technique of certificateless hybrid signcryption to an elliptic curve cryptosystem, and construct a low-computation certificateless hybrid signcryption scheme. In the random oracle model, this scheme is proven to have the indistinguishability against adaptive chosen-ciphertext attacks (IND-CCA2) under the elliptic curve computation Diffie-Hellman assumption. Also, it has strong existential unforgeability against adaptive chosen-message attacks (sUF-CMA) under the elliptic curve discrete logarithm assumption. Analysis shows that the cryptographic algorithm does not rely on pairing operations and is much more efficient than other algorithms. In addition, it well suits to applications in environments where resources are constrained, such as wireless sensor networks and ad hoc networks.