Study On Certificateless Aggregate Signature And Its Application In WBAN

The Internet of Things(Io T)is an extension of the Internet and sets off the third revolution of the world information industry.It has extremely broad prospects and significant application value in the fields of technology development,business,military,medical and other aspects.As an indispensable part of the Io T,wireless sensor network(WSN)has been paid high attention from industry and academia in recent years and made great progress in various fields.The burgeoning wireless body area network is not only a branch and extension of the WSN in medical aspect,but also an important application mode of the Io T in real life.The wireless body area network is composed of different sensors which are embedded in the human body or distributed around the body surface with special functions such as calculation,storage and communication.Centering on the human body,WBAN monitors lots of important physiological information in different parts of the body in real time.It also perceives and collects much surrounding environment information to provide services for a variety of applications in wireless communication network.WBAN usually transmits a lot of privacy information in the open wireless environment,which makes it vulnerable to various security threats or attacks.Sensitive data also suffers from a risk of being leaked or maliciously tampered.At the same time,most sensor nodes in WBAN have weak computing power and limited storage resource.Therefore,designing secure and efficient protocols has become a significant way to achieve mutual authentication and privacy protection among communication entities in the promotion and practical application of WBAN.This thesis primarily designs a new certificateless aggregate signature scheme and then proposes an authentication protocol with high security and efficiency for WBAN.The main contributions are outlined as follows:Firstly,we use digital signature technology to achieve the network security authentication and privacy preservation based on WBAN.Moreover,the concept of aggregation signature(AS)is introduced into this thesis and by combining it with the certificateless public key cryptosystem,a new secure and efficient certificateless aggregation signature algorithm is proposed,which compresses multiple signatures into a single aggregation signature with fixed length.This effectively reduces the computation overhead of signature verification and improves the efficiency of information transmission in communication process.In the Random Oracle Model,this scheme is well resist to adaptive selection messages and identity attacks assuming the hardness of computational Diffie-Hellman problem.Secondly,this thesis introduces the system structure,network characteristics and security requirements of WBAN in detail.Considering openness and complexity of the environment,WBAN has to face diverse threats or challenges such as network wiretapping,replay attacks,tampering of message and denial of service(Do S)attacks.Data transmitted in WBAN needs to meet authentication,integrity,confidentiality and freshness.Meanwhile,many important applications in both medical and non-medical areas have been summarized.Finally,based on the proposed aggregate signature algorithm,a mutual authentication protocol is designed for wireless body area network with high security and efficiency,which not only meets the security requirements of WBAN,but also greatly reduces the computation overhead and system resource consumption in the authentication process.Through security and perfomance analysis,the new protocol is secure against reply attacks,forgery attacks or Do S attacks and more efficient compared with non-aggregation mode,which is more suitable for the environment with low bandwidth,low storage,low computing power and other restrictions.