Question

Help write down below program with C++ language!!! Please...

The Cipher Program Requirements An interactive program is required that allows a user to encode text using any of

three possible ciphers. The three ciphers you are to offer are: Caesar, Playfair and Columnar Transposition.

• The program needs to loop, repeating to ask the user if they wish to play with Caesar, Playfair or Columnar Transposition

until the user wishes to stop the program.

•For encoding, the program needs to read input phrases (you can limit these to a max of250 characters) and the selected c

ipher to apply from:

o the keyboard

o from an input file § For file input, the file may contain multiple phrases to encode.

o When encoding the option should exist for the original text phrase(s), the key and the encoded phrase to be

written to the screen as well as always being logged (written) to an output file.The program will write each encoded message and key for decoding to a file dedicated to each cipher type. The user may select a filename and to it the program will attach the text: Caesar/playfair/colTransto complete the file name. Thus, after the program runs there will be at most three encoded data files generated-one for each cipher type–each of which contains all the encoded data and associated keys needed to decode. This file should be readable as an input file to the decode option.

• For decoding, the program should accept:

o a keyboard entered encoded phrase and key for decoding

o a file with one or more sets of codes to decode consisting of: key information and the encoded phrase to decode.

oWhen decoding the option should exist for the original encoded message(s), the key and the decoded phrase to be logged (written) to an output file for later examination.

Important general requirements to take note of and related grading:

1.Your submission must be submitted by the required date and time indicated in Canvas.

2.The program must compile and run (0 credit if it doesn’t compile)

3.The program must have comment headers for the program and each function; descriptive comments w/in the function bodies. (0 credit if no or relatively useless comments)

4.The program may NOT contain:

a. global variables,

b. more than 1 return statement per function,

c. only/majority of functions with 0 parameters

d. exit, continue or goto statements.

e. Break statements other than standard use w/in a switch statement case.(0 credit for global variables, 50% loss of credit for other)

5.Unless previously discussed with your instructor you may only make use of C++ techniques found in chapters 1-7 of your text. (No pointers, structs, classes, vectors,etc...)

6.The final project program must contain at least 10 functions that modularize the project.

The functions will illust rate your command of parameter passing. (0 credit if fewer than 10 meaningful functions).

7.The due date/time is a hard date–no late assignments accepted–0 credit for late submissions.

Answer 1

Source code: -
------------------------------
#include <string.h>
#include <stdlib.h>
#include<fstream>
#include <iostream>
#include<bits/stdc++.h>
using namespace std;
class Encoding
{
    public:
        map<int,int> keyMap;
        string const key="venky";
    public:
        void setOrder()
        {           
            for(int i=0; i < key.length(); i++)
            {
                keyMap[key[i]] = i;
            }
        }
    public:
        string encryptMessage(string msg)
        {
            int row,col,j;
            string cipher = "";
            col = key.length();
            row = msg.length()/col;
            if (msg.length() % col)
                row += 1;
            char matrix[row][col];
            for (int i=0,k=0; i < row; i++)
            {
                for (int j=0; j<col;)
                {
                    if(msg[k] == '\0')
                    {
                             matrix[i][j] = '_';
                         j++;
                    }
                    if( isalpha(msg[k]) || msg[k]==' ')
                    {
                        matrix[i][j] = msg[k];
                        j++;
                    }
                    k++;
                }
            }
            for (map<int,int>::iterator ii = keyMap.begin(); ii!=keyMap.end(); ++ii)
            {
                j=ii->second;
                for (int i=0; i<row; i++)
                {       
                    if( isalpha(matrix[i][j]) || matrix[i][j]==' ' || matrix[i][j]=='_')
                    cipher += matrix[i][j];
                }
            }
            return cipher;
        }
    public:
        string decryptMessage(string cipher)
        {
            int col = key.length();
            int row = cipher.length()/col;
            char cipherMat[row][col];
            for(int j=0,k=0; j<col; j++)
            for (int i=0; i<row; i++)
            cipherMat[i][j] = cipher[k++];
            int index = 0;
            for(map<int,int>::iterator ii=keyMap.begin(); ii!=keyMap.end(); ++ii)
                ii->second = index++;
            char decCipher[row][col];
            map<int,int>::iterator ii=keyMap.begin();
            int k = 0;
            for (int l=0,j; key[l]!='\0'; k++)
            {
                j=keyMap[key[l++]];
                for (int i=0; i<row; i++)
                {
                    decCipher[i][k]=cipherMat[i][j];
                }
            }
            string msg = "";
            for (int i=0; i<row; i++)
            {
                for(int j=0; j<col; j++)
                {
                    if(decCipher[i][j] != '_')
                    msg += decCipher[i][j];
                }
            }
            return msg;
        }
    public:
    string Caesar_Cipher(char text[], int s)
    {
        string result = "";
        int length=strlen(text);
        for (int i=0;i<length;i++)
        {
            if (isupper(text[i]))
                result += char(int(text[i]+s-65)%26 +65);
            else
                result += char(int(text[i]+s-97)%26 +97);
        }
        return result;
    }
   
};
int main()
{
    Encoding obj;
    string cipher;
    char Ciher_text[100],Playpair[100],Columnar[100];
    int shift=4,option;
    ifstream playpair_text,caeser_text,Columnar_text;
    caeser_text.open("Caeser.txt",ios::in);
    Columnar_text.open("Columnar.txt",ios::in);
    playpair_text.open("PlayFair.txt",ios::in);
    cout<<"\nWelcome to the Encoding Techniques"<<endl;
    while(true)
    {
        cout<<"\nMENU"<<endl;
        cout<<"\n1.CaeserCipher"<<endl;
        cout<<"\n2.PlayFair"<<endl;
        cout<<"\n3.Columnar Transposition"<<endl;
        cout<<"\n4.stop/exit"<<endl;
        cout<<"\nPlease select any Option "<<endl;
        cin>>option;
        switch(option)
        {
            case 1:
                caeser_text>>Ciher_text;
                cout<<"\nPlain Text is:"<<Ciher_text<<endl;
                cout<<"\nshift: "<<shift<<endl;
                cout<<"\nCipher Text: "<<obj.Caesar_Cipher(Ciher_text,shift);
                break;
            case 2:
                playpair_text>>Playpair;
                cout<<"\nPlain Text is:"<<Playpair<<endl;
                break;
            case 3:
                Columnar_text>>Columnar;
                cout<<"\nPlain Text is:"<<Columnar<<endl;
                obj.setOrder();
                cipher = obj.encryptMessage(Columnar);
                cout<<"\nEncrypted Message is: "<<cipher<<endl;
                cout<<"\nDecrypted Message is: "<<obj.decryptMessage(cipher)<<endl;
                break;
            case 4:
                exit(0);
            default:
                cout<<"\n Invalid Option"<<endl;
        }
    }
    return 0;
}

Sample Output: -
------------------------

Welcome to the Encoding Techniques

MENU

1.CaeserCipher

2.PlayFair

3.Columnar Transposition

4.stop/exit

Please select any Option
1

Plain Text is:WelcometotheWolrd

shift: 4

Cipher Text: AipgsqixsxliAspvh
MENU

1.CaeserCipher

2.PlayFair

3.Columnar Transposition

4.stop/exit

Please select any Option
3

Plain Text is:Received10000Rupees

Encrypted Message is: eee_eRs_cde_Rvp_iu__

Decrypted Message is: ReceivedRupees

MENU

1.CaeserCipher

2.PlayFair

3.Columnar Transposition

4.stop/exit

Please select any Option
4

--------------------------------
Process exited after 12.48 seconds with return value 0
Press any key to continue . . .

Welcome to the Encoding Techniques MENU 1.CaeserCipher 2.PlayFair з.columnar Transposition 4.stop/exit Please select any Option Plain Text is:WelcometotheWolrd shift: 4 Cipher Text: AipgsqixsxliAspvh MENU 1.CaeserCipher 2.PlayFair з.columnar Transposition 4.stop/exit Please select any Option Plain Text is:Received10000Rupees Encrypted Message is: eee_eRs_cde_Rvp iu Decrypted Message is: ReceivedRupees

shift: 4 Cipher Text AipgsqixsxliAspvh ENU 1.CaeserCipher 2.PlayFair 3.Columnar Transposition 4.stop/exit Please select any Option Plain Text is Received10000Rupees Encrypted Message is: eee-eRs_cde_Rvpiu_ Decrypted Message is: ReceivedRupees ENU 1.CaeserCipher 2.PlayFair 3.Columnar Transposition 4.stop/exit Please select any Option Process exited after 12.48 seconds with return value e Press any key to cont inue . . .