| With the more and more in-depth integration of network information technology into our daily learning and life,people have left digital footprints in various forms of huge data in cyberspace.Digital footprints can record personal information and reveal the characteristics of groups.While facilitating human-computer interaction,digital footprints also bring privacy and security issues,which has attracted wide attention.For massive,multi-source,heterogeneous data information,how to mine the information safely and efficiently and provide users with more high-quality social services has become a serious challenge.But we don't want to leak too much privacy information because of digital footprints,which will lead to life troubles and economic losses.This requires us to study the privacy protection technology of digital footprints.In this paper,the protection of digital footprint privacy in large data environment,including its general methods and key technologies,is studied and analyzed,which is consist of the following aspects.Firstly,the classification of digital footprints is studied by generation source,storage location and data type,and the generation mechanism of digital footprints after classification is studied.Taking PC and mobile digital footprints as representative research objects,the essence of digital footprints is fully demonstrated through the analysis and research of the principle and methods of digital footprints file type,generation,modification and deletion.Looking for the weak links of existing protection technologies.Secondly,the basic protection measures of digital footprints are summarized,including some conventional management measures and technical means.For large data services and information security,this paper expounds the threat detection technology based on big data,authentication technology based on big data,data authenticity analysis based on big data,and summarizes the research methods of big data analysis of digital footprints.It also introduces the latest frontier protection technologies,such as digital Footprint-based protection technology,block chain technology,server-side encryption algorithm technology,data retrieval technology,wireless sensor privacy technology,false traj ectory privacy protection technology.Then,focusing on the lack of technical protection in digital footprint privacy of privacy images,this paper proposes a privacy image protection method based on image low-bit steganography technology.Through image format conversion,image LSB(Least Significant Bits)steganography and encryption algorithm protection,the hidden image is obtained.It reduces the acquisition probability of the real privacy image and protects the user's privacy.The simulation results show that when the ratio of carrier image to secret image data is very large,the confusion effect of image generated by the image privacy protection method based on image low-bit steganography is better.After the introduction of encryption algorithm,the attacker's cracking is more difficult.Therefore,the encryption method based on image low-level steganography technology proposed for privacy image protection in digital footprint protection has certain value.Finally,a new point of view is put forward:digital footprints are the safest if they are not paid attention to.From this,a new idea of digital footprint confusion and camouflage technology is derived.For example,network "digital code",dead mailbox,virtual identity and so on.It provides a new direction for the research of digital footprint confusion protection. |
