1. Radware global application & network security report 2018-2019;Herberger,2019
2. T.C. Group, Crypsis releases 2020 Incident Response and Data Breach Report, [Online]. Available: https://www.securityinfowatch.com/cybersecurity/press-release/21141149/the-crypsis-group-crypsis-releases-2020-incident-response-and-data-breach-report.
3. C. Point, Cyber SEcurity Report, [Online]. Available: https://www.ntsc.org/assets/pdfs/cyber-security-report-2020.pdf.
4. DNS as a Covert Channel Within Protected Networks;Bromberger,2011
5. R. Falcone, DNS Tunneling in the Wild: Overview of oilrig’s dns Tunneling, [Online]. Available: https://unit42.paloaltonetworks.com/dns-tunneling-in-the-wild-overview-of-oilrigs-dns-tunneling/.