Sniffing
(Packet Sniffing)
Sniffing is the process of capturing and analyzing data packets that
travel across a computer network.
The
software tools used for this purpose are called Sniffers or Packet
Analyzers.
Sniffing
is not always illegal — it is commonly used by network administrators and cybersecurity professionals to
monitor traffic, troubleshoot networks, and detect security problems.
 |
| Diagram explaining how packet sniffing attacks capture network data packets and why HTTPS encryption protects sensitive information |
Simple Example to Understand Sniffing
Imagine
your home has a Wi-Fi network.
·
You and your sister both connect to the same
Wi-Fi using the password.
·
Since both devices are on the same network, data
packets travel through the same communication channel.
If a
malicious user runs a packet-capturing tool on the network, they may attempt to
observe transmitted data packets.
If
the website uses unsecured HTTP
communication, sensitive information may be visible in readable form.
However,
modern websites use HTTPS (encrypted
communication), which protects passwords and personal data from being
read by attackers.
How
Packet Sniffing Works (Conceptually)
1. Data
travels across a network in small units called packets.
2. A
sniffer monitors network traffic.
3. Captured
packets are analyzed for troubleshooting or security monitoring.
4. If
encryption is not used, data may be exposed.
Types
of Sniffing
1. Passive Sniffing
·
Observes traffic without modifying it.
·
Common in shared networks.
2. Active Sniffing
·
Attempts to manipulate network traffic to
capture data.
·
Considered a malicious activity when done
without permission.
Why
Sniffing Can Be Dangerous
Attackers may try to:
·
Steal login credentials
·
Monitor private communication
·
Capture sensitive information
This
is why secure communication protocols are important.
How to Prevent
Sniffing Attacks?
✅
Use HTTPS websites
✅ Avoid public Wi-Fi for sensitive logins
✅ Use VPN
connections
✅ Enable network encryption (WPA2/WPA3)
✅ Keep systems updated
Also Read:
Introduction
Of Virus, warms, intruders, insiders, criminal organizations, cyber terrorist,
security attacks, phishing attack and SQL injection?
What
is Security Attacks? What is Active and Passive Attack??
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