Research On Access Control Technology Based On Combined Public Key Cryptography For Wireless Body Area Networks

The Internet of things is a network that connects some objects to each other with certain techniques.Wireless body area networks is an application model of Internet of things.It's a human-centered self-organizing network.When the wireless body area networks are applied in e-healthcare,it's used to collect and process the data of human body and environment parameters.It then uploads these data to the related medical server.The physicians can access the data and use these data to analyze the disease of patients.This can achieve real-time monitoring of patients.If there are some illegal users who have accessed patient's data or tampered with the data,it will affect the doctors' analysis of the disease,and even may cause serious concequences for the patient.Thus,it's necessary to control the access of users.The main research of this thesis is the access control technique in wireless body area networks.In addition,wireless body area networks is a kind of networks with very limited resources.So,it's necessary to design efficient and low energy consumption algorithms to achieve user access control and ensure data security.In order to solve the above problems,this thesis mainly finishes the following works:(1)An efficient certificateless signcryption scheme was designed.Then we designed an access control scheme for wireless body area networks based on the certificateless signcryption scheme.This scheme can satisfy confidentiality,integrity,authentication and non-repudiation simultaneously in a logical step.We proved that this scheme can also satisfy public verifiability and ciphertext authenticity.These two properties make it useful in wireless body area networks.In addition,this scheme requires less computation cost and energy consumption,and has neither key escrow problem nor public key certificates.(2)A combined public-key scheme in the case of attribute-based cryptography was designed.Then we designed an access control scheme for wireless body area networks based on the combined public-key scheme.This scheme has both public key encryption and digital signature functions.In this scheme,encryption and signature can use a common key pair.In the random oracle model,we proved that the scheme satisfies ciphertext indistinguishability under adaptive chosen ciphertext attacks and existential unforgeability under adaptive chosen messages attacks.This scheme can satisfy confidentiality,integrity,authentication,non-repudiation,collusion resistance and signer privacy.In addition,it can reduce the computation cost of the private key generation and the required storage space of the private key.The size of ciphertext and signature is constant in this scheme.The above two schemes are designed based on the characteristics of wireless body area networks.They can satisfy data confidentiality,integrity,authentication and non-repudiation simultaneously.Therefore,they have certain application value in solving the user access control of wireless body area networks.