If the network already poisoned, when Alan want to send packet to Brian, Alan will translate Brian(192.168.1.3) with MAC 00-00-00-00-00-00-00-03 and vice versa. The correct way is should be like that, but because the attacker doing an ARP spoofing or ARP poisoning they will change the ARP mapping. So if Alan want to connect to Brian, the computer will translate Brian IP address(192.168.1.3) to its MAC address 00-00-00-00-00-00-00-02. If we as a human absolutely we will know who is Alan and who is Brian by recognizing them from their face, but for our computer they depend on the ARP table network mapping (OSI layer 2 and layer 3). Here I try to describe using picture(courtesy of: ). The man in the middle attack can happen because the attacker modified the ARP table( ARP spoofing) and change the ARP mapping to malicious attacker computer. Generally, the aim is to associate the attacker's MAC address with the IP address of another host (such as the default gateway), causing any traffic meant for that IP address to be sent to the attacker instead. The attacker must be able to intercept all messages going between the two victims and inject new ones, which is straightforward in many circumstances (for example, an attacker within reception range of an unencrypted Wi-Fi wireless access point, can insert himself as a man-in-the-middle).Īnd what is ARP poisoning or ARP spoofing? according to wikipedia:Ī technique whereby an attacker sends fake ("spoofed") Address Resolution Protocol ( ARP) messages onto a Local Area Network. In cryptography and computer security is a form of active eavesdropping in which the attacker makes independent connections with the victims and relays messages between them, making them believe that they are talking directly to each other over a private connection, when in fact the entire conversation is controlled by the attacker. All trademarks, registered trademarks, product names and company names or logos mentioned herein are the property of their respective owners.What is man in the middle attack? according to wikipedia:
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