Covert communication can conceal the existence of wireless transmission and thus has the ability to address information security transfer issue in many applications of the booming Internet of Things(IoT).However,the p...Covert communication can conceal the existence of wireless transmission and thus has the ability to address information security transfer issue in many applications of the booming Internet of Things(IoT).However,the proliferation of sensing devices has generated massive amounts of data,which has increased the burden of covert communication.Considering the spatiotemporal correlation of data collection causing redundancy between data,eliminating duplicate data before transmission is beneficial for shortening transmission time,reducing the average received signal power of warden,and ultimately realizing covert communication.In this paper,we propose to apply delta compression technology in the gateway to reduce the amount of data generated by IoT devices,and then sent it to the cloud server.To this end,a cost model and evaluation method that is closer to the actual storage mode of computer systems is been constructed.Based on which,the delta version sequence obtained by existing delta compression algorithms is no longer compact,manifested by the still high cost.In this situation,we designed the correction scheme based on instructions merging(CSIM)correction to save costs by merging instructions.Firstly,the delta version sequence is divided into five categories and corresponding merge rules were derived.Then,for any COPY/ADD class delta compression algorithm,merge according to strict to relaxed to selection rules while generating instructions.Finally,a more cost-effective delta version sequence can be gained.The experimental results on random data show that the delta version sequences output by the CSIM corrected 1.5-pass and greedy algorithms have better performance in cost reducing.展开更多
提出了一种采用变换域通信系统(TDCS)技术实现的重叠于卫星通信链路上的隐蔽通信系统,该系统将隐蔽信号叠加在卫星通信系统原业务信号上,通过透明转发器进行隐蔽通信.首先分析了隐蔽通信系统的收发过程,建立了系统的信息隐藏模型,根据...提出了一种采用变换域通信系统(TDCS)技术实现的重叠于卫星通信链路上的隐蔽通信系统,该系统将隐蔽信号叠加在卫星通信系统原业务信号上,通过透明转发器进行隐蔽通信.首先分析了隐蔽通信系统的收发过程,建立了系统的信息隐藏模型,根据信息隐藏的安全信息隐藏范式定义了重叠隐蔽通信的安全性,最后对系统的通信能力与安全性进行了仿真分析.仿真结果表明:TDCS具有良好的抗干扰能力,即使干信比达15 d B,当信噪比为-13 d B时依然能使系统误码率控制在10-4左右,相比较于采用直扩实现,TDCS更适合于信号重叠的隐蔽通信系统.隐蔽信号叠加之后对于原系统的数据接收几乎未造成影响,可认为重叠的隐蔽系统是安全的.展开更多
基金supported by regional innovation capability guidance plan of Shaanxi Provincial Department of science and Technology(2022QFY01-14)Plan Project of the Xi’an Science and Technology(22GXFW0047)under Grant+1 种基金Science,Technology Plan Project of Xi’an Bei lin District(GX2214)under GrantKey R&D projects of Xianyang Science and Technology Bureau(2021ZDYF-NY-0019)。
文摘Covert communication can conceal the existence of wireless transmission and thus has the ability to address information security transfer issue in many applications of the booming Internet of Things(IoT).However,the proliferation of sensing devices has generated massive amounts of data,which has increased the burden of covert communication.Considering the spatiotemporal correlation of data collection causing redundancy between data,eliminating duplicate data before transmission is beneficial for shortening transmission time,reducing the average received signal power of warden,and ultimately realizing covert communication.In this paper,we propose to apply delta compression technology in the gateway to reduce the amount of data generated by IoT devices,and then sent it to the cloud server.To this end,a cost model and evaluation method that is closer to the actual storage mode of computer systems is been constructed.Based on which,the delta version sequence obtained by existing delta compression algorithms is no longer compact,manifested by the still high cost.In this situation,we designed the correction scheme based on instructions merging(CSIM)correction to save costs by merging instructions.Firstly,the delta version sequence is divided into five categories and corresponding merge rules were derived.Then,for any COPY/ADD class delta compression algorithm,merge according to strict to relaxed to selection rules while generating instructions.Finally,a more cost-effective delta version sequence can be gained.The experimental results on random data show that the delta version sequences output by the CSIM corrected 1.5-pass and greedy algorithms have better performance in cost reducing.
文摘提出了一种采用变换域通信系统(TDCS)技术实现的重叠于卫星通信链路上的隐蔽通信系统,该系统将隐蔽信号叠加在卫星通信系统原业务信号上,通过透明转发器进行隐蔽通信.首先分析了隐蔽通信系统的收发过程,建立了系统的信息隐藏模型,根据信息隐藏的安全信息隐藏范式定义了重叠隐蔽通信的安全性,最后对系统的通信能力与安全性进行了仿真分析.仿真结果表明:TDCS具有良好的抗干扰能力,即使干信比达15 d B,当信噪比为-13 d B时依然能使系统误码率控制在10-4左右,相比较于采用直扩实现,TDCS更适合于信号重叠的隐蔽通信系统.隐蔽信号叠加之后对于原系统的数据接收几乎未造成影响,可认为重叠的隐蔽系统是安全的.
