RSA Algorithm (Java)
import java.util.*;
class RSA
{
public static void main(String args[])
{
Scanner sc=new Scanner(System.in);
System.out.println(“Enter 2 Prime nos”);
int p=sc.nextInt();
int q=sc.nextInt();
int n=p*q;
int fi=(p-1)*(q-1);
System.out.println(“Enter the value for e”);
int e=sc.nextInt(); Continue reading “RSA Algorithm (Java)”
Data Encryption Standard (Java)
import java.util.*;
import java.io.*;
class des
{
static int ip[] = new int[] {2,6,3,1,4,8,5,7};
static int ip_inv[] = new int[] {4,1,3,5,7,2,8,6};
static int p_4[] = new int[] {2,4,3,1};
static int p_10[] = new int[] {3,5,2,7,4,10,1,9,8,6};
static int p_8[] = new int[] {6,3,7,4,8,5,10,9};
static int left_one[] = new int[] {2,3,4,5,1,7,8,9,10,6};
static int left_two[] = new int[] {3,4,5,1,2,8,9,10,6,7};
static int expand[] = new int[] {4,1,2,3,2,3,4,1};
static int sbox0[][] = new int[][] {{1,0,3,2},{3,2,1,0},{0,2,1,3},{3,1,3,2}};
static int sbox1[][] = new int[][] {{0,1,2,3},{2,0,1,3},{3,0,1,0},{2,1,0,3}}; Continue reading “Data Encryption Standard (Java)”
Basic OTP (Java)
import java.util.*; class TimeOutTask extends TimerTask { boolean isTimedOut = false; public void run() { isTimedOut = true; } } class BasicOTP { public static void main(String args[]) { Random r = new Random(); String otp = new String(); for(int i=0 ; i<8 ; i++) { otp += r.nextInt(10); } System.out.println(otp); TimeOutTask task = new TimeOutTask(); Timer t = new Timer(); t.schedule(task, 10000L); ClientThread c … Continue reading Basic OTP (Java)
OTP Client (Java)
import java.util.*; import java.io.*; import java.net.*; class OTPClient { public static void main(String args[]) throws IOException { Scanner scan = new Scanner(System.in); System.out.println(“Connecting to the server…”); Socket clientSocket = new Socket(“localhost”, 7777); PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true); BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream())); // Client enters ID. This will be used by the program for verifying who // is communicating as well as check … Continue reading OTP Client (Java)
OTP Server (Java)
import java.util.*; import java.io.*; import java.net.*; class TimeOutTask extends TimerTask { boolean isTimedOut = false; public void run() { isTimedOut = true; } } class OTPServer { public static void main(String args[]) throws IOException { ServerSocket serverSocket = new ServerSocket(7777); System.out.println(“Server running and waiting for client…”); Socket clientSocket = serverSocket.accept(); PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true); BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream())); // Server waits … Continue reading OTP Server (Java)
Darshan Gajara 