In today’s world, the Internet is critical to both economy and society.
The DNS , a key component of the Internet infrastructure
The infrastructure is highly distributed amongst a wide range of players , such as ISPs, Internet exchange points & network access points, Telecoms carriers, Hosting providers and Registrars. They all play an essential role in how the Internet operates, and each is faced with a specific range of threats.
What is DNS?
Humans can’t think like computers. they just can’t remember dozens of IP addresses. They need easy-to-remember names to locate their Mail server or their favorite Web pages.
To make our lives on the Internet-easier,DNS was therefore invented. It translates Host’s name into its IPaddress
How does DNS work?
Internet is an IP network. Every host contains an IP address that must be known to any other host willing to communicate.
DNS provides a way to know the IP address of any host on the Internet.
DNS is also a hierarchical service. Indeed a name has a structure: it can beserver1.web. yahoo.com
A host is a leaf on this tree, and any other node is called a “domain”. In our example, server1 is one of the hosts in the “web.yahoo.com”domain.
DNS continues to be a nice target for hackers
Purpose of DNS makes it a very sensitive area; for this is the place the client connection is orientated. The possibilities a black-hat can have by succeeding in hacking DNS are tremendous (a user can be directedto
A host controlled by a hacker, whatever service he might be using: http, ftp, telnet ... ).
There are two ways DNS can be hacked: by using protocol attacks (attacks based on how DNS is actually working) or by using server attacks (attacks based on the bugs or flaws of the programs or machines running DNS services).
Major types of attack targeting the DNS
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