Position Based Digital Signature Protocol With Time Constraint

Nowadays,Internet of Things(IOTs)have become an emerging field of information indus-try in the 21st century,there are lots of location and time critical data have been collected by Internet of Things(IOTs),such as intelligent fire control,intelligent transportation,en-vironmental monitoring and so on.It is well known that the location and time information of these data will play an important role on some systems,such as the fire alarm system,vehicle system and UAV data acquisition system.However,how to guarantee the security of these spatio-temporal data has become a challenge.One hand,the property of the data integrity should be provided;the other hand,the location and time information of the data origin should be unforgeable.This thesis combines the position based cryptography and digital signature scheme as one of the solutions to the security of the spatio-temporal data in IOTs.Taking the position information and transmission time of the spatio-temporal data into consideration,we pro-posed a position based digital signature protocol based on the bounded retrieval model in 3-dimension with time constraint.In this thesis,the main research results are as follows:1.System model of position based digital signature protocol is constructed.The security threats and adversary attack models that the protocol may face are analyzed.The algorithmic structure and security definition of the position based digital signature protocol in static and dynamic environments are given.2.A position based digital signature protocol is proposed.We combine the position based cryptography and digital signature scheme.Firstly,the static position based digital signa-ture without considering time and the dynamic position based digital signature with time constraint are proposed respectively.Then,a position based digital signature protocol based on the bounded retrieval model in 3-dimension is proposed which satisfies the security re-quirements of dynamic conditions.While providing data integrity properties,it ensures the unforgeability of data origin location and time information.3.Security analysis of the protocol.By analyzing the security of our protocol,we reach to the conclusion that the position based digital signature scheme proposed in this thesis can resist collusion attack of the adversaries and satisfy the provable security.4.Experiment and analysis of the protocol.Comparing the proposed scheme with the ex-isting ones and concludes that in terms of security,the proposed protocol can adapt to static senders and dynamic senders.In terms of performance,the proposed protocol does not require a secure channel between the landmark and the signer,which reduces the communi-cation cost and improves the efficiency.