The glossary below contains many of the terms you will find in common use throughout our website. Please refer to this list to find definitions of terms and answers to other Internet security-related questions.

IP spoofing

An attack in which someone intercepts and co-opts an active, established session. IP spoofing is also an attack method by which IP packets are sent with a false source address, which may try to circumvent firewalls by adopting the IP address of a trusted source. This fools the firewall into thinking that the packets from the hacker are actually from a trusted source. IP spoofing can also be used simply to hide the true origin of an attack.

IP spoofing is a process where an intruder uses an IP address of another computer to acquire information or gain access. Because the intruder appears to be someone else, if a reply is sent, it goes to the spoofed address, not the intruder’s address.