![]() This will make the target computer believe we are the default gateway and that it should be sending its traffic through us. In order to trick another computer on our network into sending their traffic to ours, we need to ARP poison. To perform this locally, we need to spoof ourselves to look like our router and start requesting traffic from another computer on our network. For example, SSL authenticates the server using a mutually trusted certification authority. Most cryptographic protocols include some form of endpoint authentication specifically to prevent MITM attacks. An attack can succeed only when the attacker can impersonate each endpoint to the satisfaction of the other-it is an attack on mutual authentication. So if you are one of the many people who do not use any form of cryptographic protocol when you browse public internet, your data is open to analysis, among other things. When performing the attack, it makes it possible to sniff traffic and intercept unencrypted data, like passwords or email messages. When you're on a network, local attackers can perform what is called a man-in-the-middle attack. As everything tends to, this method has its flaws. The router then leases your computer an unused IP address, which is used as a unique routing address for sending traffic that is meant for you, to you. When your computer first connects to a nework, it sends out a request on the network to lease an IP from the router. ![]()
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