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BANZKP is the best to date Zero Knowledge Proof (ZKP) based securelightweight and energy efficient authentication scheme designed for WirelessArea Network (WBAN). It is vulnerable to several security attacks such as thereplay attack, Distributed Denial-of-Service (DDoS) attacks at sink andredundancy information crack. However, BANZKP needs an end-to-endauthentication which is not compliant with the human body postural mobility. Wepropose a new scheme BAN-GZKP. Our scheme improves both the security andpostural mobility resilience of BANZKP. Moreover, BAN-GZKP uses only athree-phase authentication which is optimal in the class of ZKP protocols. Tofix the security vulnerabilities of BANZKP, BAN-GZKP uses a novel random keyallocation and a Hop-by-Hop authentication definition. We further prove thereliability of our scheme to various attacks including those to which BANZKP isvulnerable. Furthermore, via extensive simulations we prove that our scheme,BAN-GZKP, outperforms BANZKP in terms of reliability to human body posturalmobility for various network parameters (end-to-end delay, number of packetsexchanged in the network, number of transmissions). We compared both schemesusing representative convergecast strategies with various transmission ratesand human postural mobility. Finally, it is important to mention that BAN-GZKPhas no additional cost compared to BANZKP in terms memory, computationalcomplexity or energy consumption.

BAN-GZKP: Optimal Zero Knowledge Proof based Scheme for Wireless Body Area Networks