Reason to use more cookies than just a session hash for authentication?...

preventing libpcap to capture the packets injected with pcap_inject()...

Restricting access to a site by IP...

How does Google Analytics prevent traffic spoofing...

How to prevent HTTP Spoofing?...

Can you use ARP-Poisoning (spoofing) to apply simulated external effects?...

Spoofing the user agent of an embedded Safari browser on the iPhone?...

Using Clients IP as the Servers IP...

How to determine if a user accessing your website is not a bot?...

How do you combat website spoofing/phishing?...