6-amaliy ish Kriptografiya 1 Mavzu: Psevdotasodifiy sonlar generatorini va uning dasturiy ta’minotini yaratish

6-amaliy ish Kriptografiya_1

Mavzu: Psevdotasodifiy sonlar generatorini va uning dasturiy ta’minotini yaratish.

Chiziqli va chiziqsiz kongurent kalit xosil qilishning dasturiy ta’minotini ishlab chiqishda Java dasturlash tilidan foydalandim.

package com.company;

import java.nio.charset.StandardCharsets;

import java.util.Scanner;

public class Main {

public static void main(String[] args) {

// write your code here

Scanner km=new Scanner(System.in);

char generatsiyaturi;

System.out.println("Kalitni generatsiya qilish turini tanglang!\na tugmani bossangiz chiziqli kongurent rejimni tanlagan bo'lasiz!\nb tugmani bossangiz chiziqsiz kongurent rejimni tanlagan bo'lasiz!");

String k =km.nextLine().toLowerCase();

int w=0;

int t=0;

generatsiyaturi=k.charAt(0);

switch (generatsiyaturi){

case 'a': w++;

System.out.println(" Siz chiziqli kongurent rejimni tanladingiz!! va\nX(i+1)=(aXi+c)mod N: formula bo'yicha kalit generatsiya qilinadi "); break;

case 'b':

System.out.println("Siz chiziqsiz kongurent rejimni tanladingiz!! va\nX(i+1)=(d(Xi)^2+aXi+c)mod N: formula bo'yicha kalit generatsiya qilinadi");

t++; break;

}

if (t==1){

System.out.print("xo ni kiriting=");

int xo= km.nextInt();

System.out.print("d ni kiriting=");

int d=km.nextInt();

System.out.print("a ni kiriting=");

int a=km.nextInt();

System.out.print("c ni kiriting=");

int c=km.nextInt();

int n=9;

System.out.print("Eslatma! kalit uzunligi 8 bitdan kam bo'lmasiligi kerak va 8ga karrali bo'lsin!\nkalit uzunligini kiriting yani necha bit bo'lsin!!=");

int kk=km.nextInt();

int sonlar_soni=kk/8;

int ll=sonlar_soni*8;

int sonlar[]=new int[sonlar_soni];

sonlar[0]=xo;

for (int i = 1; i

sonlar[i]=(d*(int) Math.pow(i,2)+(sonlar[i-1]*a)+c)%n; }

System.out.print("K= ");

for (int i = 0; i

// System.out.print( sonlar[i] + " ");

String input= String.valueOf(sonlar[i]);

String result=convertByteArraysToBinary(input.getBytes(StandardCharsets.UTF_8));

System.out.print(result);

}

System.out.print (" "+ll+" bitlik kalit");

} if(w==1){

System.out.print("xo ni kiriting=");

int xo= km.nextInt();

System.out.print("a ni kiriting=");

int a=km.nextInt();

System.out.print("c ni kiriting=");

int c=km.nextInt();

int n=9;

System.out.print("Eslatma! kalit uzunligi 8 bitdan kam bo'lmasiligi kerak va 8ga karrali bo'lsin!\nkalit uzunligini kiriting yani necha bit bo'lsin!!=");

int kk=km.nextInt();

int sonlar_soni=kk/8;

int ll=sonlar_soni*8;

int sonlar[]=new int[sonlar_soni];

sonlar[0]=xo;

for (int i = 1; i

sonlar[i]=((sonlar[i-1]*a)+c)%n; }

System.out.print("K= ");

for (int i = 0; i

// System.out.print(sonlar[i] + " ");

String input= String.valueOf(sonlar[i]);

String result=convertByteArraysToBinary(input.getBytes(StandardCharsets.UTF_8));

System.out.print(result);

}

System.out.print (" "+ll+" bitlik kalit");

}

}

public static String convertByteArraysToBinary(byte[] input) {

StringBuilder result = new StringBuilder();

for (byte b : input) {

int val = b;

for (int i = 0; i < 8; i++) {

result.append((val & 128) == 0 ? 0 : 1); // 128 = 1000 0000

val <<= 1;

}

}

return result.toString();}}