Research On Key Technologies Of Short-range Communication Security Between Smart Mobile Devices

The society has witnessed the rapid development of the Internet of Things and mobile Internet,short-range communication between smart mobile devices is widely used in many scenarios such as smart home environment,mobile payment,and smart transportation.People address new challenges of information security while their lifestyles have changed.There are many short-range communication meth-ods,the most widely deployed hardwares of microphones and cameras on smart-phones to realize short-range communication is a popular research branch.In the screen-camera short-range communication field,a novel communication method is proposed which is dynamic hidden dual-channel communication.However,there are problems that need to be addressed,such as the limitation of shooting angles and the difficulty of real-time decoding of data.In the acoustic short-range com-munication field,the blind source separation can achieve eavesdropping attack from the acoustic communication based on friendly jamming technology.Therefore,how to effectively improve the availability and security of above mentioned short-range communication methods has important significance.We focuses on the security problems of short-range communication with no extra communication chips.This thesis aims to improve the availability and security of the short-range communica-tion in screen-camera and acoustic communication methods and mainly studies the following three aspects:(1)We propose a dynamic and invisible screen-camera communica-tion system combining a fast image correction scheme with a multi-level message distribution scheme.Previous studies focus on the usability of com-munication by optimizing communication methods and coding pattern.This thesis first describes the usability and security issues of screen-camera short-range com-munication.A fast image correction scheme is proposed to solve the capture angle challenge and the time overhead issue of the frame correction.A novel encoding pattern scheme is designed for dynamic and invisible communication,which can reduce the time overhead of decoding frame and fulfill Data security requirement.The proposed is verified with experimental results for enhanced capture angle by achieving the maximum capture angle(60 degrees in the side view,60 degrees in the bottom vies,and 180 degrees in the rotation angle).The system reduces the time overhead by 90%in image correction processing.The throughout improves 13%comparing with existing work.Experimental results show that this thesis improves security of camera-screen hidden communication.(2)We propose an enhanced acoustic short-range communication system that exploits devices mobility,friendly jamming technology,and secret sharing scheme for data confidentiality.Previous studies were based on friendly interference technology to ensure the data security of voice short-range communication,and it did not fully consider the problem of blind source signal separation attacks that make friendly interference technology invalid.The blind source separation(BSS)attack can separate the data signal from the mixed signal,this thesis extends the secure communication distance by using the portable device's mobility for smartphones to address this challenge.We prove the security of our protocol through theoretical analysis and experimental verification.Experimental results show that compared with the previous work of less than 1cm,the secure communication distance of the protocol can reach 30cm,which effectively improves the usability and security of the protocol.(3)We propose a multi-factor authentication protocol for short-range communication in smart home scenario.Previous studies proposed identity authentication protocols based on symmetric or asymmetric encryption algorithms,but it did not consider the design of identity authentication protocols based on the characteristics of short-range communication methods.This thesis describes the features of short-range communication based on its communication channel,then we proposes a lightweight multi-factor authentication protocol for smart home scenarios.By combining the user's biometrics with the hardware fingerprint from the microphone and speaker while authenticating the identity of the device and the user.Theoretical analysis and experimental verification show the availability of the agreement.In summary,we systematically study the short-range communication between the screen-camera channel and sound channel.This thesis proposes two communi-cation protocols with better usability and security,and a lightweight multi-mode for smart home scenarios.Through theoretical analysis and experimental verification,it has important practical significance for the application of short-range communica-tion based on its own hardwares and the protection of user communication security and privacy.