An Efficient Certificateless Aggregate Signature Scheme Without Pairings for Healthcare Wireless Sensor Network

Wireless sensor network (WSN) can be widely used in the field of health care since it has many advantages, such as low cost, high efficiency, low latency, and so on. In healthcare wireless sensor network (HWSN), the patients’ health information needs to be transmitted to health professionals in real time through the Internet, so it is vital to ensure the integrity and privacy of medical information. Aggregate signature (AS) cannot only provide message integrity and authentication for multiple users but also drastically improve the efficiency of signature transmission and verification. Certificateless public key cryptography (CLPKC) is superior to traditional public key infrastructure and identity-based cryptography. We combine the advantages of CLPKC and AS and construct a certificateless aggregate signature (CLAS) scheme without using pairings. Our CLAS scheme realizes the protection of the privacy and integrity of healthcare information for multiple patients in HWSN for the first time. Under the assumption of elliptic curve discrete logarithm, the proposed CLAS scheme is existentially unforgettable against two types of adversaries. In addition, the scheme has better performance than other CLAS schemes as for the security, communication overhead, and computational costs. So it is more suitable for green HWSN.

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