Jamming and anti-Jamming Techniques
                     Jamming and anti-
Jamming 
Techniques
Introduction
• Jamming makes use of intentional radio interferences to harm 
wireless communications by keeping communicating medium 
busy, causing a transmitter to back-off whenever it senses busy 
wireless medium or corrupted signal received at receivers.
Source: krazytech.com
Types of jammers
• Jammers are malicious wireless nodes planted by an attacker to 
cause intentional interference in a wireless network. 
• Depending upon the attack strategy, a jammer can either have 
the same or different capabilities from legitimate nodes in the 
network which they are attacking.
Source: krazytech.com
Proactive jammer 
•  Proactive jammer transmits jamming signals whether or not there 
is data communication in a network. It sends packets or random 
bits on the channel it is operating on, putting all the others nodes 
on that channel in non-operating modes.
Source: krazytech.com
Deceptive jammer
• Deceptive jammer continuously transmits regular packets instead 
of emitting random bits (as in constant jammer). It deceives other 
nodes to believe that a legitimate transmission is taking place so 
that they remain in receiving states until the jammer is turned off 
or dies.
Source: krazytech.com
Reactive RTS/CTS jammer 
• Reactive RTS/CTS jammer jams the network when it senses a 
request-to-send (RTS) message is being transmitted from a 
sender. It starts jamming the channel as soon as the RTS is sent. 
Source: krazytech.com
Function-specific Jammers
• Function-specific jamming is implemented by having a pre-
determined function. In addition to being either proactive or 
reactive, they can both work on a single channel to conserve 
energy or jam multiple channels and maximize the jamming 
throughput irrespective of the energy usage. 
Source: krazytech.com
 Smart-hybrid Jammers 
• We call them smart because of their power efficient and effective 
jamming nature. The main aim of these jammers is to magnify 
their jamming effect in the network they intend to jam.
Source: krazytech.com
Anti-jamming in wireless mobile 
networks
• Most jamming detection and countermeasure are designed and evaluated 
in static networks. The ant jamming problem becomes more challenging 
in a mobile network environment where jammers may move and cause 
the malfunction of jammer detection and localization algorithms.
Source: krazytech.com
Conclusion
• In this extensive study on jamming and anti-jamming techniques in 
wireless networks, we have contributed by classifying and summarizing 
various approaches and discussing open research issues in the field.
• Different jammers attack wireless networks in various ways so that their 
attack effects are significantly different. 
Source: krazytech.com
THANK 
YOU