Steps to Implement Cryptography in ns3

To implement cryptography in ns3 consists to create application that simulates encoding and decoding of data as it transfers over the network. Our distinguished team is responsible for carrying out the application of various cryptography principles. Here are the procedures for you to guide on how to set up a simple network with cryptographic functionalities by ns3 environment.

Step-by-Step Implementation

Install ns3

Make sure ns3 is installed on your system. You can download and install it.

Define the Network Topology

Describe the network topology that contains:

Sender node
Receiver node

Create Network Nodes

Create network nodes using NodeContainer.

NodeContainer senderNode, receiverNode;

senderNode.Create(1);

receiverNode.Create(1);

Set Up Network Devices

Install network devices on the nodes using appropriate network interfaces, such as WiFi for wireless communication.

WifiHelper wifi;

wifi.SetStandard(WIFI_PHY_STANDARD_80211n_5GHZ);

WifiMacHelper mac;

mac.SetType(“ns3::AdhocWifiMac”);

YansWifiPhyHelper phy = YansWifiPhyHelper::Default();

YansWifiChannelHelper channel = YansWifiChannelHelper::Default();

phy.SetChannel(channel.Create());

NetDeviceContainer senderDevice = wifi.Install(phy, mac, senderNode);

NetDeviceContainer receiverDevice = wifi.Install(phy, mac, receiverNode);

Configure Mobility Model

Set up the mobility model for the nodes.

MobilityHelper mobility;

mobility.SetMobilityModel(“ns3::ConstantPositionMobilityModel”);

mobility.Install(senderNode);

mobility.Install(receiverNode);

Implement Cryptography Application

Create an application that performs encryption and decryption. Below is an example of a simple cryptographic application.

Cryptographic Application (Example)

class CryptoApplication : public Application {

public:

void StartApplication() override {

sendSocket = Socket::CreateSocket(GetNode(), UdpSocketFactory::GetTypeId());

sendSocket->Connect(InetSocketAddress(destAddress, destPort));

recvSocket = Socket::CreateSocket(GetNode(), UdpSocketFactory::GetTypeId());

recvSocket->Bind(InetSocketAddress(Ipv4Address::GetAny(), localPort));

recvSocket->SetRecvCallback(MakeCallback(&CryptoApplication::ReceivePacket, this));

// Schedule the first packet send

SendPacket();

}

void SetRemote(Address address, uint16_t port) {

destAddress = address;

destPort = port;

}

void SetLocalPort(uint16_t port) {

localPort = port;

}

void SendPacket() {

std::string message = “Hello, this is an encrypted message”;

std::string encryptedMessage = EncryptMessage(message);

Ptr<Packet> packet = Create<Packet>((uint8_t*) encryptedMessage.c_str(), encryptedMessage.size());

sendSocket->Send(packet);

// Schedule the next packet send

Simulator::Schedule(Seconds(1.0), &CryptoApplication::SendPacket, this);

}

void ReceivePacket(Ptr<Socket> socket) {

Ptr<Packet> packet;

Address from;

while ((packet = socket->RecvFrom(from))) {

std::string encryptedMessage = std::string((char*) packet->PeekData(), packet->GetSize());

std::string message = DecryptMessage(encryptedMessage);

std::cout << “Received message: ” << message << std::endl;

}

std::string EncryptMessage(const std::string& message) {

// Placeholder encryption logic

std::string encrypted = message;

std::reverse(encrypted.begin(), encrypted.end()); // Simple reverse encryption for demonstration

return encrypted;

}

std::string DecryptMessage(const std::string& encryptedMessage) {

// Placeholder decryption logic

std::string decrypted = encryptedMessage;

std::reverse(decrypted.begin(), decrypted.end()); // Simple reverse decryption for demonstration

return decrypted;

}

private:

Ptr<Socket> sendSocket;

Ptr<Socket> recvSocket;

Address destAddress;

uint16_t destPort;

uint16_t localPort;

};

Set Up Applications

Install the applications on the nodes.

ApplicationContainer senderApp, receiverApp;

// Sender application

Ptr<CryptoApplication> senderCryptoApp = CreateObject<CryptoApplication>();

senderCryptoApp->SetRemote(receiverNode.Get(0)->GetObject<Ipv4>()->GetAddress(1, 0).GetLocal(), 9);

senderCryptoApp->SetLocalPort(10);

senderNode.Get(0)->AddApplication(senderCryptoApp);

senderCryptoApp->SetStartTime(Seconds(1.0));

senderCryptoApp->SetStopTime(Seconds(20.0));

senderApp.Add(senderCryptoApp);

// Receiver application

Ptr<CryptoApplication> receiverCryptoApp = CreateObject<CryptoApplication>();

receiverCryptoApp->SetLocalPort(9);

receiverNode.Get(0)->AddApplication(receiverCryptoApp);

receiverCryptoApp->SetStartTime(Seconds(1.0));

receiverCryptoApp->SetStopTime(Seconds(20.0));

receiverApp.Add(receiverCryptoApp);

Set Up Routing Protocols

Configure routing protocols for the network.

AodvHelper aodv;

InternetStackHelper internet;

internet.SetRoutingHelper(aodv);

internet.Install(senderNode);

internet.Install(receiverNode);

Assign IP Addresses

Assign IP addresses to the network devices.

Ipv4AddressHelper address;

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

Ipv4InterfaceContainer senderInterfaces = address.Assign(senderDevice);

Ipv4InterfaceContainer receiverInterfaces = address.Assign(receiverDevice);

Run the Simulation

Configure the simulation runtime and execute it.

Simulator::Stop(Seconds(20.0));

Simulator::Run();

Simulator::Destroy();

Example of a Simple Cryptographic Network Script

The given below is the sample script for cryptographic network:

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “ns3/wifi-module.h”

#include “ns3/mobility-module.h”

#include “ns3/applications-module.h”

#include “ns3/aodv-module.h”

using namespace ns3;