An Improved RSA-based Certificateless Signature Scheme for Wireless Sensor Networks

The entire world is looking to fulfill the need of the hour in terms of security. Certificateless cryptography is an efficient approach studied widely due to two reasons: first, it eliminates the need of certificate authority in public key infrastructure and second, it can resolve key escrow problem of ID-based cryptography. Recently, Zhang et al. proposed a novel security scheme based on RSA, applicable to real life applications but could not cope up with the well defined attacks. This paper, presents an RSA-based CertificateLess Signature (RSA-CLS) scheme applicable to wireless sensor networks. The security of RSA-CLS is based on the hardness assumption of Strong RSA. The scheme is proven to be secure against Type I and Type II attack in random oracle model.