Abstract Currently, Internet of Medical Things (IoMT) gained popularity because of an ongoing pandemic. A few developed countries plan to deploy the IoMT for improving the security and safety of frontline workers to decrease the mortality rates of COVID‐19 patients. However, IoMT devices share the information through an open network which leads to increased vulnerability to various attacks. Hence, electronic health management systems remain many security challenges, like recording sensitive patient data, secure communication, transferring patient information to other doctors, providing the data for future medical diagnosis, collecting data from WBAN, etc. In addition, the sensor devices attached to the human body are resource‐limited and have minimal power capacity. Hence, to protect the medical privacy of patients, confidentiality and reliability of the system, the register sensor, doctor and server need to authenticate each other. Therefore, rather than two factors, in this work, a multifactor authentication protocol has been proposed to provide more secure communication. The presented scheme uses biometric and fuzzy extractors for more security purposes. Furthermore, the scheme is proved using informal and formal security verification BAN logic, ProVerif and AVISPA tools. The ProVerif simulation result of the suggested scheme shows that the proposed protocol achieves session key secrecy and mutual authentication

Three novel configurations of second order inverse band reject filters (IBRFs) are proposed in this work by using a single operational transresistance amplifier (OTRA). The working of the proposed inverse filters are verified in simulation by implementing 180 nm CMOS model of OTRA in SPICE and also in hardware with AD844AN IC. Theoretical frequency response characteristics of all the three proposed configurations match very well with the simulated characteristics. Layout of the proposed configuration has been implemented using Analog Design Environment (ADE) tool of cadence virtuoso to study the feasibility of operation. Monte Carlo analysis has also been performed to study the effect of variation in passive components on the performance of the circuits. Sensitivity analysis has been studied.

In modern era, remote user can access the multiple-services from anywhere in the world at any time through Internet. So, to provide the legitimacy among the users, various remote user authentication schemes have been designed. Recently, Chuang and Chang has proposed a scheme under multi-server architecture based on three security factors namely, smart card, password and biometric and claimed that, their scheme can resist several kind of attacks and can be successful to provide more security properties than that of existing schemes. In this paper, we have reviewed their schemes and proved that Chuang and Chang's scheme cannot resist server spoofing or user impersonate attack, password guessing attack and also fails to achieve forward key secrecy. To overcome their weaknesses and fulfill such important security requirements, we have proposed an improved remote user authentication scheme under multi-server environment.

Rapid development of computer networks laid a trend to share the information worldwide. However, one of the important criterions is to provide the confidentiality to the shared data over the insecure communication channel. Due to the growth of computer technology; assuring the security of such shared information becomes challenging and complicated task among the researchers. In this consequence, the dynamic key approach is most desirable as compared to static key. In this respect, the AVK is one of the best techniques to achieve the perfect security as per the literature. In this paper, we have proposed a dynamic mechanism of AVK to enhance the security by increasing the randomness among the successive keys.