How to Implement Network Privacy Control in NS2

To implement Network Privacy Control in NS2 has needs to include mimicking the privacy-preserving mechanisms like encryption, anonymization, or traffic obfuscation. In NS2, while privacy control mechanisms are not built-in, so we can mimic the behaviour of privacy control by modelling encrypted interaction, traffic filters, and network anonymization approaches.

Here’s a guide on how to implement a simple Network Privacy Control simulation in NS2:

Step-by-Step implementation:

  1. Set up NS2
  • Make sure NS2 is installed. If not, install it by running:

sudo apt-get install ns2

  1. Define the Network Topology
  • In NS2, network simulations are described in a Tcl script. We can describe the network nodes and connections as for any simulation.

Here’s an sample of generating a simple topology:

set ns [new Simulator]

set tracefile [open privacy_trace.tr w]

$ns trace-all $tracefile

set n1 [$ns node]

set n2 [$ns node]

# Create a duplex link between the nodes

$ns duplex-link $n1 $n2 1Mb 10ms DropTail

 

  1. Simulate Encryption for Privacy

To simulate encryption for privacy control:

  • When communication is “encrypted,” we can denote this by adding dummy encryption functions in the Tcl script. The simulation won’t actually encode the data, however we can mimic the effect such as increased transmission times, additional overhead.

# Dummy encryption function: Simulate encryption overhead

proc encrypt {packet_size} {

set encrypted_size [expr $packet_size + 100] ;# Add overhead for encryption

return $encrypted_size

}

# Create traffic source (UDP) and attach to n1

set udp1 [new Agent/UDP]

$ns attach-agent $n1 $udp1

# Create traffic sink (Null agent) and attach to n2

set null0 [new Agent/Null]

$ns attach-agent $n2 $null0

# Connect the agents

$ns connect $udp1 $null0

# Traffic generation (CBR – Constant Bit Rate)

set cbr1 [new Application/Traffic/CBR]

$cbr1 set packetSize_ [encrypt 512] ;# Encrypt the packet (dummy)

$cbr1 set interval_ 0.1

$cbr1 attach-agent $udp1

  1. Simulate Traffic Anonymization

We can replicate anonymization by adjust the packet headers or by mimic the anonymized routing, in which source and destination addresses are “masked” or altered in the network simulation. In practice, this would mean generating intermediate nodes that change the packet headers to anonymize the sender or the recipient.

# Define anonymizing node

set anonymizer [$ns node]

# Create anonymized routing function (dummy)

proc anonymize {src dst} {

puts “Anonymizing traffic from $src to $dst”

return “Anonymous”

}

# Modify routing to pass through anonymizer

$ns duplex-link $n1 $anonymizer 1Mb 10ms DropTail

$ns duplex-link $anonymizer $n2 1Mb 10ms DropTail

# Simulate anonymized traffic

set anonymized_src [anonymize $n1 $n2]

puts “Traffic routed from $anonymized_src”

  1. Simulate Privacy Policies (Traffic Filters)

To implement privacy policies like limiting what kinds of traffic are permitted, that we can generate traffic filters. For instance, we might block specific kinds of traffic or mimicpacket inspection (without revealing sensitive content).

# Function to filter traffic based on privacy policies

proc filter_traffic {traffic_type} {

if { $traffic_type == “private” } {

puts “Traffic allowed: Privacy-preserving traffic”

return 1

} else {

puts “Traffic blocked: Non-privacy traffic”

return 0

}

}

# Filter traffic based on type

set traffic_type “private”

if {[filter_traffic $traffic_type]} {

# If traffic is allowed, start sending

$ns at 1.0 “$cbr1 start”

} else {

puts “Traffic blocked due to privacy policy”

}

  1. Run the Simulation

Execute the simulation by implementing the Tcl script in NS2:

ns your_script.tcl

  1. Analyze the Trace

After the simulation executes, evaluate the privacy_trace.tr file created to review how the privacy mechanisms affects the network behaviour. For instance:

  • We can validate for latency because of encryption.
  • Review the anonymization process by validating the packet headers.
  • Monitor if certain kinds of traffic were filtered or blocked according to privacy policies.
  1. Extend the Simulation

We can expand this simulation by adding:

  • Key Exchange Protocols: To mimic key exchange mechanisms to introduce secure interaction among nodes.
  • Traffic Obfuscation: To mimic the use of traffic padding or mixing approaches to obfuscate traffic patterns and avoid traffic analysis attacks.

Example Script Overview

Here’s an overview of what we implemented in NS2:

  • Encryption Simulation: we replicate an encryption by adding overhead to packet sizes.
  • Anonymization: we transmiitted traffic via anonymizing nodes that mask the source and destination.
  • Traffic Filtering: we replicated privacy policies by filtering out specific kinds of traffic according to pre-defined rules.

In this module, we had clearly understood the implementation procedures, sample snippets was given to enforce the Network Privacy Control with the help of ns2 tool. We also deliver further significant information regarding the Network Privacy Control will be provided.

We are specialised in developing models for encrypted interactions, traffic filtering, and network anonymization techniques pertinent to your project. For innovative ideas on Network Privacy Control using the ns2 tool, please visit ns2project.com. We encourage you to share your specific requirements with us, allowing our team to conduct a thorough network comparative analysis tailored to your research needs.