can I modify this code to be implemented correctly using (MOD 27) and encrypting a space to any other letter, and returning it back in the decryption import java.util.; class AffineCipher { public static String encryptionMessage(String Msg) { String CTxt = ""; int a = 3; int b = 6; for (int i = 0; i < Msg.length(); i++) { if(Msg.charAt(i)!=' ') CTxt = CTxt + (char) ((((a Msg.charAt(i)) + b) % 26) + 65); else CTxt = CTxt + Msg.charAt(i); } return CTxt; } public static String decryptionMessage(String CTxt) { String Msg = ""; int a = 3; int b = 6; int a_inv = 0; int flag = 0; for (int i = 0; i < 26; i++) { flag = (a * i) % 26; if (flag == 1) { a_inv = i; System.out.println(i); } } for (int i = 0; i < CTxt.length(); i++) { if(CTxt.charAt(i)!=' ') Msg = Msg + (char) (((a_inv * ((CTxt.charAt(i) - b)) % 26)) + 65); else Msg = Msg + CTxt.charAt(i); } return Msg; } public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("Enter the message: "); String message = sc.nextLine(); System.out.println("Message is :" + message); System.out.println("Encrypted Message is : " + encryptionMessage(message)); System.out.println("Decrypted Message is: " + decryptionMessage(encryptionMessage(message))); sc.close(); } }

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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How can I modify this code to be implemented correctly using (MOD 27) and encrypting a space to any other letter, and returning it back in the decryption

import java.util.*; class AffineCipher { public static String encryptionMessage(String Msg) { String CTxt = ""; int a = 3; int b = 6; for (int i = 0; i < Msg.length(); i++) { if(Msg.charAt(i)!=' ') CTxt = CTxt + (char) ((((a * Msg.charAt(i)) + b) % 26) + 65); else CTxt = CTxt + Msg.charAt(i); } return CTxt; } public static String decryptionMessage(String CTxt) { String Msg = ""; int a = 3; int b = 6; int a_inv = 0; int flag = 0; for (int i = 0; i < 26; i++) { flag = (a * i) % 26; if (flag == 1) { a_inv = i; System.out.println(i); } } for (int i = 0; i < CTxt.length(); i++) { if(CTxt.charAt(i)!=' ') Msg = Msg + (char) (((a_inv * ((CTxt.charAt(i) - b)) % 26)) + 65); else Msg = Msg + CTxt.charAt(i); } return Msg; } public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("Enter the message: "); String message = sc.nextLine(); System.out.println("Message is :" + message); System.out.println("Encrypted Message is : " + encryptionMessage(message)); System.out.println("Decrypted Message is: " + decryptionMessage(encryptionMessage(message))); sc.close(); } }

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