Authenticated Key Agreement Protocols For Wireless Body Area Networks

In wireless body area networks(WBANs),body sensors transmit sensitive information through controller/gateway so that medical professionals can access patient data online using wireless independent on patient location.Due to the open wireless communication channels,security and privacy issues are major concerns in WBANs.For example a malicious third party can modify and retransmit intercepted messages.Another example is the architecture of traditional WBAN environment which is consisted of a single point of failure and management.To address this,current solutions enable a receiver to authenticate the source of received messages as well as to check their integrity before accepting them.However,these solutions do not adequately address the efficiency problem of existing cryptographic protocols for critical devices such as implantable body sensors.To address this,we propose novel,provably secure and efficient certificateless authenticated key agreement(CLAKA)protocols for WBAN systems based on blockchain environment.The proposed protocols are designed using pairings and without pairings.Additional to that,some important digital signatures such as ring signature,blind signature and security mediated signature(SEM)are used to assure authentication and privacy among blockchain nodes.These solutions ensure the contributions for this thesis as follows:1.To ensure security and efficiency of CLAKA over WBAN,we proposed a new CLAKA protocol for blockchain-based WBANs using pairing.The proposed protocol achieves important security proporties such as escrowless,anonymity and verifiability.Also,the implementation via java for pairing based cryptography(j PBC)proved that the proposed protocol has a better performance compared to the existing relevant protocols.2.We proposed a pairing-free certificateless authenticated key agreement for blockchain-based WBAN.The protocol is efficient and provides anonymity.It can compute a session key between WBAN entities in a blockchain environment.Also,the comparison proved that the proposed protocol has less computational burden compared to other protocols.3.We proposed a certificateless authenticated key agreement for decentralized WBANs.The protocol is designed without pairings.A session key is computed to secure communications.A security mediated signature is used to provide ver-ification and instant revocation on blockchain nodes.It is an efficient signature suitable for resource constrained devices like WBAN sensors.The comparison and performance evaluation proved that our protocol achieves more security features and it is efficient compared with related protocols.All the proposed protocols are proved in random oracle model(ROM)based on elliptic curve discret logarithm(ECDL),bilinear Diffie-Helmann(BDH)and computational Diffie-Helmann(CDH)hard problems.Application scenarios were proposed to prove the applicability of the protocols.A need for secure authenticated key agreement protocols based on blockchain covers the important role to secure data transmission,and confidentiality in WBANs.This thesis proposes solutions in designing,improving the security and privacy of sensitive data and entities for WBANs.