*** How To Hack Into Remote Computers VERY RARE EBOOK ***

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Spoofing is an active security attack in which one machine on the network masquerades as a different machine.

As an active attack, it disrupts the normal flow of data and may involve injecting data into the communications link between other machines.

This masquerade aims to fool other machines on the network into accepting the impostor as an original, either to lure
the other machines into sending it data or to allow it to alter data. The meaning of spoof here is not a lighthearted parody, but rather a deception intended to trick one into accepting as genuine something that is actually false. Such deception can have grave consequences because notions of trust are central to many networking systems. Sniffing may seem innocuous (depending on just how sensitive and confidential you consider the information on your network), some network security attacks use sniffing as a prelude to spoofing. Sniffing gathers sufficient information to make the deception believable.

Sniffing

Sniffing is the use of a network interface to receive data not intended for the machine in which the interface resides. A variety of types of machines need to have this capability. A token-ring bridge, for example, typically has two network interfaces that normally receive all packets traveling on the media on one interface and retransmit some, but not all, of these packets on the other interface. Another example of a device that incorporates sniffing is one typically
marketed as a network analyzer. A network analyzer helps network administrators diagnose a variety of obscure problems that may not be visible on any one particular host. These problems can involve unusual interactions between more than just one or two machines and sometimes involve a variety of protocols interacting in strange ways.

Devices that incorporate sniffing are useful and necessary. However, their very existence implies that a malicious person could use such a device or modify an existing machine to snoop
on network traffic. Sniffing programs could be used to gather passwords, read inter-machine e-mail, and examine client-server database records in transit. Besides these high-level data, lowlevel information might be used to mount an active attack on data in another computer system.