| Authentication is a crucial part of security communication because it plays an important role in preventing malicious users from accessing the network,and maintaining message integrity.At present,most of the watermarking schemes require a shared key in advance.In the large scale internet of things scenario,nodes frequently join and leave the networks that cause the distribution and management of keys particularly difficult.Furthermore,the existing research seldom consider the design of systems and the embedding mechanism of tags.To address these problems,we propose a tag-based scheme without key distribution.Then,the framework is extended to the Multiple Input Multiple Output(MIMO)system by utilizing the constellation dithering.The transmission efficiency and reliability of the system is further improved by the Space Time Block Coding(STBC)technology.Specifically,the shared keys is generated by utilizing the channel state information between the legal nodes.Then,the keys and signals are coupled by a hash algorithm to generate authentication tags.In order to weaken the influence of noise and the difference of generated keys,a fault tolerant hash algorithm is designed.The information theories and hypothesis testing is employed to analyze the performance of system.Simulation results show that the agreement ratio of the generating keys is as high as 96%,when the signal to noise ratio is 10 dB.Performance analysis demonstrate the scheme can resist against multiple attacks,such as replay,jamming,tampering,and impersonation attack.Two different tag embedding schemes are described based on constellation dithering.In MIMO-STBC system,the error performance of messages and tags and the detection performance of two schemes are analyzed.Furthermore,the power allocation between the message and tag is discussed to characterize the trade-off of error performance.Simulation results show that compared with the single input single output system,the MIMO-STBC technology significantly reduces the bit error rate of the messages and tags,and improves the detection rate of the receiver.Figure 20;Table 2;Reference 60... |
