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sniffer
Last modified: Thursday, July 29, 2004 

A program and/or device that monitors data traveling over a network. Sniffers can be used both for legitimate network management functions and for stealing information off a network. Unauthorized sniffers can be extremely dangerous to a network's security because they are virtually impossible to detect and can be inserted almost anywhere. This makes them a favorite weapon in the hacker's arsenal.

On TCP/IP networks, where they sniff packets, they're often called packet sniffers.

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eSecurity Planet 
A resource for daily information on e-security targeted to IT managers. The site provides users with information from a variety of sources, including experts at security product and services firms, and the consultants who follow the security industry.

related categories

Ethics

Network Management

Security

related terms

CERT/CC

hacker

honeypot

intrusion detection system

network management

passive reconnaissance

pulsing zombie

S/key

script kiddie

security

session hijacking

zombie


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