How to Implement Cryptography in OMNeT++

To implement the cryptography in OMNeT++ requires a network which is designed and simulated to secure communication by using cryptographic techniques such as encryption, decryption, digital signatures, and key exchange protocols. Here’s a step-by-step process to implementing cryptography in OMNeT++ using the INET framework:

Step-by-Step Implementation:

Install OMNeT++ and INET Framework

Make certain to install the OMNeT++ and the INET Framework on your computer.

Create a New OMNeT++ Project

Open OMNeT++ IDE: Start the OMNeT++ IDE.
Create a New Project: Go to File -> New -> OMNeT++ Project. Give a name to the project (e.g., CryptoNetworkSimulation).

Define the Network Topology

Determine the network topology that contains both hosts and router by creating a new NED file.

Example: Crypto Network Topology (CryptoNetwork.ned)

package cryptonetwork;

import inet.node.inet.StandardHost;

import inet.node.inet.Router;

network CryptoNetwork

{

parameters:

@display(“bgb=800,400”);

submodules:

host1: StandardHost {

@display(“p=100,200”);

}

host2: StandardHost {

@display(“p=300,200”);

}

router: Router {

@display(“p=200,100”);

}

connections allowunconnected:

host1.ethg++ <–> Eth10M <–> router.ethg++;

host2.ethg++ <–> Eth10M <–> router.ethg++;

}

Configure the Simulation

Configure the simulation’s parameters by creating an OMNeT++ initialization file.

Example: Configuration File (omnetpp.ini)

[General]

network = cryptonetwork.CryptoNetwork

sim-time-limit = 200s

# Visualization

*.visualizer.canvasVisualizer.displayBackground = true

*.visualizer.canvasVisualizer.displayGrid = true

# Host Configuration

*.host*.numApps = 1

*.host*.app[0].typename = “CryptoApp”

*.host*.app[0].destAddresses = “host2”

*.host*.app[0].destPort = 5000

*.host*.app[0].messageLength = 1024B

*.host*.app[0].sendInterval = 1s

# Router Configuration

*.router.numPorts = 2

# IP Address Configuration

*.host1.ipv4.config = xmldoc(“host1.xml”)

*.host2.ipv4.config = xmldoc(“host2.xml”)

*.router.ipv4.config = xmldoc(“router.xml”)

Create IP Address Configuration Files

Create XML files to define the IP address configuration for each node.

Example: IP Configuration File for host1 (host1.xml)

</interface>

</config>

Example: IP Configuration File for host2 (host2.xml)

</interface>

</config>

Example: IP Configuration File for router (router.xml)

</interface>

</interface>

</config>

Implement Cryptographic Logic

Executing the custom applications that handle encryption and decryption to simulate cryptographic operations,.

Example: Cryptographic Application (Pseudo-Code)

#include <omnetpp.h>

#include <inet/applications/udpapp/UdpBasicApp.h>

#include <cryptopp/cryptlib.h>

#include <cryptopp/aes.h>

#include <cryptopp/filters.h>

#include <cryptopp/modes.h>

#include <cryptopp/osrng.h>

using namespace omnetpp;

using namespace inet;

class CryptoApp : public UdpBasicApp

{

protected:

virtual void initialize(int stage) override;

virtual void handleMessageWhenUp(cMessage *msg) override;

void encryptAndSend(cMessage *msg);

void receiveAndDecrypt(cMessage *msg);

};

Define_Module(CryptoApp);

void CryptoApp::initialize(int stage) {

UdpBasicApp::initialize(stage);

if (stage == INITSTAGE_APPLICATION_LAYER) {

// Custom initialization code

}

void CryptoApp::handleMessageWhenUp(cMessage *msg) {

if (msg->isSelfMessage()) {

encryptAndSend(msg);

} else {

receiveAndDecrypt(msg);

}

UdpBasicApp::handleMessageWhenUp(msg);

}

void CryptoApp::encryptAndSend(cMessage *msg) {

// Encryption logic using Crypto++ library

using namespace CryptoPP;

AutoSeededRandomPool prng;

SecByteBlock key(AES::DEFAULT_KEYLENGTH);

prng.GenerateBlock(key, key.size());

byte iv[AES::BLOCKSIZE];

prng.GenerateBlock(iv, sizeof(iv));

std::string plaintext = “This is a secret message”;

std::string ciphertext;

try {

CBC_Mode<AES>::Encryption encryption;

encryption.SetKeyWithIV(key, key.size(), iv);

StringSource(plaintext, true,

new StreamTransformationFilter(encryption,

new StringSink(ciphertext)

)

);

// Send the encrypted message

cMessage *encryptedMsg = new cMessage(“encryptedMsg”);

encryptedMsg->setKind(0);

send(encryptedMsg, “out”);

} catch(const CryptoPP::Exception& e) {

EV << “Encryption error: ” << e.what() << “\n”;

}

void CryptoApp::receiveAndDecrypt(cMessage *msg) {

// Decryption logic using Crypto++ library

using namespace CryptoPP;

AutoSeededRandomPool prng;

SecByteBlock key(AES::DEFAULT_KEYLENGTH);

prng.GenerateBlock(key, key.size());

byte iv[AES::BLOCKSIZE];

prng.GenerateBlock(iv, sizeof(iv));

std::string ciphertext = “encrypted message received”;

std::string decryptedtext;

try {

CBC_Mode<AES>::Decryption decryption;

decryption.SetKeyWithIV(key, key.size(), iv);

StringSource(ciphertext, true,

new StreamTransformationFilter(decryption,

new StringSink(decryptedtext)

)

);

EV << “Decrypted text: ” << decryptedtext << “\n”;

} catch(const CryptoPP::Exception& e) {

EV << “Decryption error: ” << e.what() << “\n”;

}

delete msg;

}

Note: In the above sample, we used Crypto++ library for cryptographic operations. We need to install and connect the Crypto++ library with the OMNeT++ project.

Run the Simulation

Build the Project: Right-click on project and choose Build Project.
Run the Simulation: In the OMNeT++ IDE, click on the green play button to start the simulation.

As we discussed earlier, this approach can guide you to install and implement the cryptography and the INET framework, their security mechanisms in the OMNeT++. If needed, we will offer you any details of cryptographic or OMNeT++ or their framework through another script.

Seek assistance regarding the simulation and comparative analysis of cryptographic methods within the OMNeT++ programming environment.