Techniques for defense against domain name system (DNS) cyber-attacks
US10938851B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 2018 |
| Grant date | Mar 2, 2021 |
| Priority date | — |
| Expiry date | May 9, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2463/142
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and system for detecting and mitigation recursive domain name system (DNS) cyber-attacks are disclosed. The method includes receiving DNS queries directed to a DNS resolver, wherein the DNS resolver is communicatively connected between at least one client and at least one name server; parsing each received DNS query to extract a hostname identified therein; updating at least one array of Bloom filters using the extracted hostname; computing a ratio of an unrecognized hostnames per sample (UPS) based on the contents of the at least one array; and determining if the UPS ratio is abnormal, wherein an abnormal UPS ratio is an indication of an attack.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.