How to Begin Implement a Cryptography in NS3

To create an execution for Cryptography in ns3 has includes the replicate a secure communication through integrate for encode and decode devices the network protocols or applications. Although ns-3 does not natively maintenance the cryptographic performance, we can incorporate the cryptographic collections such as OpenSSL or estimate the custom cryptographic logic.

Here’s how to begin:

Steps to Begin Implement Cryptography in NS3

1. Understand Cryptography in Network Simulation

• Cryptographic Operations:
  • Encryption and Decryption: Secure the transmission among their nodes.
  • Authentication: Make sure classify the communication events.
  • Key Exchange: Securely for distribute the cryptographic keys.
• Use Cases:
  • It replicate the secure communication for instance HTTPS, VPNs.
  • Estimate the performance of overhead cryptographic processes.
  • Validate the custom secure protocols.

2. Set up ns-3 Environment

1. Install ns-3:

git clone https://gitlab.com/nsnam/ns-3-dev.git

cd ns-3-dev

./build.py

1. Validate the installation:

./ns3 run hello-simulator

1. Install a cryptographic collection for sample OpenSSL:

sudo apt install libssl-dev

3. Plan the Secure Network Architecture

• Components:
  • The Nodes are connect the securely for sample clients, servers.
  • The data modification for secure the protocols.
• Traffic:
  • Encrypted communication between nodes.
  • It validates the environment with and without encode for comparison.

4. Write the Simulation Script
5. Include Necessary Headers

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “ns3/point-to-point-module.h”

#include “ns3/applications-module.h”

#include <openssl/aes.h>  // OpenSSL for cryptographic functions

1. Define Nodes

ns3::NodeContainer nodes;

nodes.Create(2);  // Two nodes: client and server

1. Set Up Point-to-Point Links

ns3::PointToPointHelper p2p;

p2p.SetDeviceAttribute(“DataRate”, ns3::StringValue(“1Gbps”));

p2p.SetChannelAttribute(“Delay”, ns3::StringValue(“2ms”));

ns3::NetDeviceContainer devices = p2p.Install(nodes);

1. Install Internet Stack

ns3::InternetStackHelper internet;

internet.Install(nodes);

ns3::Ipv4AddressHelper address;

address.SetBase(“10.1.1.0”, “255.255.255.0”);

ns3::Ipv4InterfaceContainer interfaces = address.Assign(devices);

5. Add Cryptographic Functionality
6. Encrypt and Decrypt Functions

Use OpenSSL for AES encryption and decryption:

void Encrypt(const unsigned char* plaintext, unsigned char* ciphertext, const unsigned char* key) {

AES_KEY encryptKey;

AES_set_encrypt_key(key, 128, &encryptKey);

AES_encrypt(plaintext, ciphertext, &encryptKey);

}

void Decrypt(const unsigned char* ciphertext, unsigned char* plaintext, const unsigned char* key) {

AES_KEY decryptKey;

AES_set_decrypt_key(key, 128, &decryptKey);

AES_decrypt(ciphertext, plaintext, &decryptKey);

}

1. Custom Application for Secure Communication

1. Define a Custom Application:

class SecureApp : public ns3::Application {

private:

virtual void StartApplication() override {

unsigned char key[16] = “0123456789abcdef”;  // Example key

unsigned char plaintext[16] = “Hello, ns-3!”;

unsigned char ciphertext[16];

unsigned char decryptedtext[16];

Encrypt(plaintext, ciphertext, key);

std::cout << “Encrypted Message: “;

for (int i = 0; i < 16; i++) {

std::cout << std::hex << (int)ciphertext[i];

}

std::cout << std::endl;

Decrypt(ciphertext, decryptedtext, key);

std::cout << “Decrypted Message: ” << decryptedtext << std::endl;

}

};

Ptr<SecureApp> app = CreateObject<SecureApp>();

nodes.Get(0)->AddApplication(app);

app->SetStartTime(ns3::Seconds(1.0));

app->SetStopTime(ns3::Seconds(10.0));

1. Transmit Encrypted Messages:
   • It replicate the forwarding a ciphertext from the client to the server.
   • It decodes the message for a server.

6. Install Applications

Secure Client-Server Communication

// UDP Echo server on the server node

ns3::UdpEchoServerHelper echoServer(9);

ns3::ApplicationContainer serverApp = echoServer.Install(nodes.Get(1));

serverApp.Start(ns3::Seconds(1.0));

serverApp.Stop(ns3::Seconds(20.0));

// UDP Echo client on the client node with encryption

ns3::UdpEchoClientHelper echoClient(interfaces.GetAddress(1), 9);

echoClient.SetAttribute(“MaxPackets”, ns3::UintegerValue(10));

echoClient.SetAttribute(“Interval”, ns3::TimeValue(ns3::Seconds(1.0)));

echoClient.SetAttribute(“PacketSize”, ns3::UintegerValue(1024));

ns3::ApplicationContainer clientApp = echoClient.Install(nodes.Get(0));

clientApp.Start(ns3::Seconds(2.0));

clientApp.Stop(ns3::Seconds(20.0));

7. Run the Simulation

ns3::Simulator::Run();

ns3::Simulator::Destroy();

8. Analyze Results

Metrics:

• Performance Overhead:
  • The performances are calculated the delay and throughput with and without encode.
• Security Evaluation:
  • Studies the efficiency for cryptographic device is called a security implementation.

Tracing and Visualization:

• Permit the files for analysis .pcap and .tr:

ns3::AsciiTraceHelper ascii;

p2p.EnableAsciiAll(ascii.CreateFileStream(“crypto.tr”));

p2p.EnablePcapAll(“crypto”);

• Use Wireshark to examine the encode congestion.

9. Iterate and Enhance

• Advanced Cryptography:
  • Estimate the secure key modification for instance Diffie-Hellman.
  • It Improve the helps for TLS or IPsec.
• Dynamic Scenarios:
  • Attacks are replicate the like eavesdropping or spoofing to experiment the robustness.
• Scalability:
  • It replicates the many clients and servers by secure communication.

By means of we discussed previous about how the Cryptography will analyze the performance in ns3 environment and we maintenance to offer additional information about how the Cryptography will change in altered surroundings.