Comments on “A Secure and Lightweight Drones-Access Protocol for Smart City Surveillance”

Recently, Akram et al. (2021) proposed a drones-access protocol for monitoring urban security. Akram et al. claimed that their protocol is secure and can resist known security attacks. However, in this comment article, we demonstrate that their protocol is still vulnerable to drone capture attacks and stolen-verifier attacks. In addition, their protocol does not provide perfect forward secrecy. Finally, we present an improved protocol to manage the security weaknesses we found.