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Network eavesdropping, also known as eavesdropping attack, sniffing attack, or snooping attack, is a method that retrieves user information through the internet.This attack happens on electronic devices like computers and smartphones.
The threat model of history sniffing relies on the adversary being able to direct the victim to a malicious website entirely or partially under the adversary's control. The adversary can accomplish this by compromising a previously good web page, by phishing the user to a web page allowing the adversary to load arbitrary code, or by using a malicious advertisement on an otherwise safe web page.
Sniffing attack in context of network security, corresponds to theft or interception of data by capturing the network traffic using a packet sniffer (an application aimed at capturing network packets). When data is transmitted across networks, if the data packets are not encrypted, the data within the network packet can be read using a sniffer. [1]
This attack can be performed either at close range (by directly looking over the victim's shoulder) or from a longer range with, for example, a pair of binoculars or similar hardware. [3] Attackers do not need any technical skills in order to perform this method, and keen observation of victims' surroundings and the typing pattern is sufficient.
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Sniffing is observed among all terrestrial vertebrates, wherein they inhale environmental air. [19] Sniffing may also occur in underwater environments wherein an animal may exhale air from within its lungs and nasal cavity to acquire odors within an aquatic environment and then re-inhale this air. [20] (See sniffing in small animals.)
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[2] [3] This paper caused some consternation in the security community, which had previously believed that such monitoring was a highly sophisticated attack available only to governments; van Eck successfully eavesdropped on a real system, at a range of hundreds of metres, using just $15 worth of equipment plus a television set.