Spoofing

In the context of computer security, a spoofing attack is a situation in which one person or program successfully masquerades as another by falsifying data and thereby gaining an illegitimate advantage.cryptography is the man-in-the-middle attack, in which an attacker spoofs Alice into believing they''re Bob, and spoofs Bob into believing they''re Alice, thus gaining access to all messages in both directions without the trouble of any cryptanalytic effort.The attacker must monitor the packets sent from Alice to Bob and then guess the sequence number of the packets. Then the attacker knocks out Alice with a SYN attack and injects his own packets, claiming to have the address of Alice. Alice''s firewall can defend against some spoof attacks when it has been configured with knowledge of all the IP addresses connected to each of its interfaces. It can then detect a spoofed packet if it arrives at an interface that is not known to be connected to the IP address.Many carelessly designed protocols are su