Can this java code be cracked? If so how can I make so that it cannot be cracked? import java.io.*; public class Main { static int plnTxt[] = new int[26]; static char theVals[] = new char[]{'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'}; static String theOtVal = "", theCipherTxt = ""; public static void main(String[] args) throws IOException { for (int i = 0; i < 26; i++) { plnTxt[i] = i; } InputStreamReader isr = new InputStreamReader(System.in); BufferedReader br = new BufferedReader(isr); System.out.println("Enter Plaintext: "); theCipherTxt = br.readLine(); System.out.println("Enter key value: "); int k = Integer.parseInt(br.readLine()); for (int i = 0; i < theCipherTxt.length(); i++) { int j; if (theCipherTxt.charAt(i) == ' ') { i++; theOtVal = theOtVal.concat(" "); } for (j = 0; j < 26; j++) { if (theCipherTxt.charAt(i) == theVals[j]) { break; } } j = (plnTxt[j] + k) % 26; theOtVal = theOtVal.concat(theVals[j] + ""); } System.out.println("After encryption: "); System.out.println(theOtVal); theCipherTxt = ""; for (int i = 0; i < theOtVal.length(); i++) { int j; if (theOtVal.charAt(i) == ' ') { i++; theCipherTxt = theCipherTxt.concat(" "); } for (j = 0; j < 26; j++) { if (theOtVal.charAt(i) == theVals[j]) { break; } } j = (plnTxt[j] - k) % 26; if (j < 0) { j = 26 + j; } theCipherTxt = theCipherTxt.concat(theVals[j] + ""); } System.out.println("After decryption: "); System.out.println(theCipherTxt); } }

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Can this java code be cracked? If so how can I make so that it cannot be cracked? import java.io.*; public class Main { static int plnTxt[] = new int[26]; static char theVals[] = new char[]{'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'}; static String theOtVal = "", theCipherTxt = ""; public static void main(String[] args) throws IOException { for (int i = 0; i < 26; i++) { plnTxt[i] = i; } InputStreamReader isr = new InputStreamReader(System.in); BufferedReader br = new BufferedReader(isr); System.out.println("Enter Plaintext: "); theCipherTxt = br.readLine(); System.out.println("Enter key value: "); int k = Integer.parseInt(br.readLine()); for (int i = 0; i < theCipherTxt.length(); i++) { int j; if (theCipherTxt.charAt(i) == ' ') { i++; theOtVal = theOtVal.concat(" "); } for (j = 0; j < 26; j++) { if (theCipherTxt.charAt(i) == theVals[j]) { break; } } j = (plnTxt[j] + k) % 26; theOtVal = theOtVal.concat(theVals[j] + ""); } System.out.println("After encryption: "); System.out.println(theOtVal); theCipherTxt = ""; for (int i = 0; i < theOtVal.length(); i++) { int j; if (theOtVal.charAt(i) == ' ') { i++; theCipherTxt = theCipherTxt.concat(" "); } for (j = 0; j < 26; j++) { if (theOtVal.charAt(i) == theVals[j]) { break; } } j = (plnTxt[j] - k) % 26; if (j < 0) { j = 26 + j; } theCipherTxt = theCipherTxt.concat(theVals[j] + ""); } System.out.println("After decryption: "); System.out.println(theCipherTxt); } }

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