A security protocol for wireless transmission is essential to defend sensitive information from malicious enemies by providing a variety of facilities such as privacy of the user’s information, secure session key, associated authentication, and user-repeal facility when a person’s authorizations are suddenly disclosed. Singh et al. proposed an improved user authentication and key agreement system for wireless sensor networks (WSNs). Authors are sure that their protocol is secure from various attacks. Here, we find several security pitfalls in their scheme, such as an offline password-guessing attack, failure to protect the session key, and a man-in-the-middle attack. To remove the identified pitfalls found in Singh et al.’s scheme, we design an enhanced authentication scheme for WSNs tailored for IoT. We prove the reliability of our proposed protocol using the real or random (RoR) model. We also evaluate the proposed scheme with the associated schemes and show its superior efficacy as compared to its counterparts.

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Recently, an authentication scheme was presented for health-care in IoT for WBANs by Fotouhi et al. Authors asserted their scheme to be free from a number of attacks.Here, we find that Fotouhi et al.'s scheme suffers from insider attack, fails to provide proper authentication and bears inefficient password update phase. Therefore their scheme has security pitfalls that can lead to further security breaches. We remove the weaknesses of Fotouhi et al.'s scheme and hence propose a user authentication scheme for patient care. Our scheme is suitable for providing special care to patients in the healthcare industry. The proposed scheme facilitates health professionals to access the real-time data of patients under treatment for some diseases.It also safeguards the medical staff from catching an infection from the patients by minimizing the need to come in direct contact with the patients. We justify the security of our proposed scheme by applying the random oracle model to it. The proposed scheme is compared with some related works to judge its efficacy over the compared counterparts.