The emergence of the E-health system has brought convenience to many chronically ill patients and elderly people with limited mobility. With the help of the E-health system, patients can upload their physiological data timely and get a diagnosis at home, which is more convenient and efficient as they do not have to line up in hospitals. In order to ensure this convenience while protecting patients’ privacy, many schemes have been proposed which can help patient and medical server authenticate each other. However, considering these patients’ inconvenience, sometimes family members need to participate in the patient’s treatment process. So, the E-health system needs to provide a secure communication platform for the family members. At present, most of the authentication schemes for the E-health system only focus on the secure communication between the patient and the medical server, while ignoring the participation of family members. Moreover, in the E-health system, the permissions of family members and patient should be different, and the medical server needs to distinguish their permissions efficiently. In order to overcome these problems, we propose a patient family binding and authentication privacy protection scheme for the E-health system. In the scheme proposed by us, the medical server can efficiently assign different permissions to the family member and patient. And our scheme can allow patient to authorize their family members freely, and the increase in the number of family members will not impose additional burden on the server. At the same time, the authentication between the family member and the medical server does not require the participation of the patient. In addition, by comparing with other related schemes, we prove that our scheme has suitable efficiency and security performance in the E-health system.

Nowadays, unmanned aerial vehicles (UAVs) are used in various fields due to their high maneuverability and low cost of construction and use. With the development of UAV technology, it has become a trend for UAVs to cooperate with each other to complete assigned tasks. Multiple UAVs are combined according to a certain structure, and through the information sharing between them, a cooperative effect is generated to achieve intelligent collaborative task execution. However, information sharing is carried out on a public channel, so ensuring secure communication between UAVs is crucial. Moreover, UAVs are easily captured by an adversary, who can impersonate legitimate UAVs to disrupt communications if UAVs’ internal secrets that are stolen. Therefore, we propose a lightweight authentication scheme based on physical unclonable function (PUF), to provide mutual authentication between UAVs. PUF is embedded in the unmanned aerial vehicle (UAV) to defend against physical capture attack. Furthermore, to evaluate the security and performance of our scheme, formal and informal security analyses and formal security verification of the scheme are performed, and the performance of the scheme is compared with existing UAV schemes. The above analyses show that our scheme has great advantages in terms of security and overheads.

Satellite communication has played an important part in many different industries because of its advantages of wide coverage, strong disaster tolerance and high flexibility. The security of satellite communication systems has always been the concern of many scholars. Without authentication, user should not obtain his/her required services. Beyond that, the anonymity also needs to be protected during communications. In this study, we design an efficient and provably secure key agreement scheme for satellite communication systems. In each session, we replace user’s true identity by a temporary identity, which will be updated for each session, to guarantee the anonymity. Because the only use of lightweight algorithms, our proposed scheme has high performance. Furthermore, the security of the proposed scheme is proved in the real-or-random model and the performance analysis shows that the proposed scheme is more efficient than some other schemes for satellite communication systems.