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To provide secure authentication for wireless body area networks (WBANs), recently Mtonga proposed a scheme based on identity-based cryptography, bilinear pairing and non-interactive identity-based key agreement scheme. He argued that his scheme provides authenticated key agreement, privacy preservation and authenticity, integrity and freshness of transmitted health messages. Unfortunately, this paper provides security remarks on Mtonga’s scheme focused on lack of integrity provision, lack of untraceability and masquerading attack feasibility. They are very important aspects in a system’s required security and privacy features. Furthermore, this paper provides simple directions of the counterpart’s solutions on them.