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Wiretapping

Wiretapping is the unauthorized interception of electronic communications, whether across traditional phone lines or modern digital networks. Physical devices or software-based methods can be used to silently monitor data in transit without the target's knowledge.

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About this video

Wiretapping is the unauthorized interception and monitoring of electronic communications, a threat that began with physical intrusions into telephone infrastructure and has evolved alongside digital networking. In its traditional form, an attacker would secretly splice into a phone line and attach specialized equipment to passively capture voice conversations without alerting either party. The core principle — silently listening to communications in transit — translates directly to modern computer networks, where an attacker can insert inline hardware or exploit network access to capture data moving between systems. In practice, wiretapping hardware can range from compact inline devices to more elaborate tap appliances, all designed to copy traffic without disrupting the original signal. When deployed in low-visibility areas such as server rooms, network closets, or cable conduits, this equipment can remain undetected for months or years. The term is also used more broadly in cybersecurity to describe any attack category centered on passive interception of network traffic, regardless of whether physical hardware is involved. Whether targeting voice communications or data network traffic, wiretapping represents a serious confidentiality threat. Defending against it requires both physical security controls to protect infrastructure access points and network-level monitoring to detect anomalous traffic patterns that may indicate an active tap or interception device.

What you'll learn

What's covered

Wiretapping

Aligned to

EC-Council CEH
4.1 Sniffing
ISC2 CISSP
4.3 Implement secure communication channels according to design
NIST 800-53
SC-8 Transmission Confidentiality and Integrity
CompTIA Security+
2.2 Explain common threat vectors and attack surfaces.

Key terms

Wiretapping
The unauthorized monitoring and interception of electronic communications, including traditional phone lines and digital network connections.
Man-in-the-Middle Attack
MitM
An attack where an adversary secretly intercepts and potentially alters communications between two parties.
Packet
A unit of data formatted for transmission over a network, containing a header, payload, and sometimes a trailer.
Encryption
The process of converting readable data into an unreadable format using an algorithm and key to prevent unauthorized access.

Topics

Wiretapping Network Interception Eavesdropping Cybersecurity Passive Attacks Network Surveillance Data In Transit

Transcript

Wiretapping is when somebody taps into a line of communication and listens to them.

Traditional Wiretapping

Traditionally, wiretapping really was about phone lines and phone communication. You would have conversations that would be going across the phone, and people would want to listen in on those conversations. What they did is they secretly connected to this line, cut into this line, and then put a special typo on here to listen to the conversation so that they could spy on these people. So that's traditionally what the word wiretapping means and how it's defined.

Applying It to Computer Networks

We could apply wiretapping to the computer network as well, because computer networks we can tap into and listen to the communication that's going across on this network. Because of the name and what it really means — listening to this communication back and forth — there are a few different interpretations of wiretapping. Some of them mean that you actually physically cut into the line, or put a piece of equipment in the line to listen to that conversation. Others say that this is more of an overall category of type of attack, where you're listening to communications that are going across the line. Either way, the idea behind wiretapping is that we're listening in on communication.

Here, I jumped on Google and typed in "network wiretap" just to see what some of these look like. Here we see there's some sort of machine that's plugged in between here. It looks like it could be somewhat obvious, but if this is in some back room or some closet or some runway, then that could go unnoticed for a long time. So that is one way to do it: we have a piece of equipment that we can put in line with that communication and then be able to tap into it. And there's also a couple of phone diagrams here of how that can tap into a line as well.

The Attack Card

Here's our attack card on that. We have wiretapping, and it's unauthorized monitoring and interception of electronic communication. It could be of phone lines, or it could be digital lines — your computer or networking lines.

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