Code For Monoalphabetic Substitution Cipher And Double Transposition Cipher

//****************************CPP FILE*************************************//

#include<iostream>

#include<string>

#include<stdlib>
#include"fstream.h"
using namespace std;

  char ciphers[26];

  char filename[26];

  ifstream file1;

  char type;

int flag=0,ind=0;

int flag1=0;

int y=0;

    char keyword[11];

char keywordweights[11];

char ch=65;

char ed=0;

char plaincipher[26][2];

char c,c1;

char temp[2];

int l=0,flag3=0;

char filename2[]="encryptedfile.txt\0";

char filename3[]="decryptedfile.txt\0";

    int len=0,wt=1,count=0,numofrows=0,col=0;

float mod=0;

ofstream file3;

char **doubletrans='\0';

void decrypt()

{

 cout<<"Enter Name Of the File You Want to Decrypt:";

  cin>>filename;

   

cout<<"Name Of The File To Be Decrypted:"<<filename<<"\n";

ofstream file2("decryptedfile.txt");

file1.open(filename);

while (file1.good())     // loop while extraction from file is possible

{ l=0;

     c = file1.get();       // get character from file

count++;

}

file1.close();

count--;

numofrows=count/len;

doubletrans=new char*[numofrows+1];

for( int i=0 ; i < numofrows+1 ; i++ )

    doubletrans[i] = new char[col];

for(i=0;i<len;i++)

doubletrans[0][i]=keywordweights[i];

    ind=1;  

  

 

int  rr=1;

int ff=1;

i=0;

int flag4=0,tt;

file1.open(filename);

while (file1.good() && tt<count)     // loop while extraction from file is possible

{ l=0;

tt++;

     c = file1.get();       // get character from file

itoa(ind,temp,10);

if(rr==numofrows+1 )

{

ff=1;

i=0;

}

while(i<len && ff==1)

 {rr=1;

 if(doubletrans[0][i]!=temp[0])

 {

 i++;

 flag4=1;

 }

 else 

 {  ind++;

    

 ff=0;

 break;

 }

 

 }

if(rr<numofrows+1 )

{doubletrans[rr][i]=c;

 rr++;

 

}

 

  }

  file3.open("keymatrix.txt");

  for(i=0;i<numofrows+1;i++)

{

for(int j=0;j<len;j++)

{ cout<<doubletrans[i][j];

   file3<<doubletrans[i][j];

}

cout<<'\n';

file3<<'\n';

}

  file1.close();           // close file

  ofstream file11(filename3);

  cout<<"decrypted text:";

  for(i=1;i<numofrows+1;i++)

  {   

for(int j=0;j<len;j++)

{if(doubletrans[i][j]!='X')

{

cout<<doubletrans[i][j];

   file11<<doubletrans[i][j];

}

}

}

  cout<<'\n';

        cout<<"Key Matrix File is 'keymatrix.txt' and Cipher Table File is 'ciphertable.txt'\n";

  cout<<"Your File Has Been Dencrypted and Dencrypted Data Is Saved To File :"<<filename3<<"\n"; 

}

bool findchar(char charr)

{

int len=strlen(ciphers);

    int t=0;

while(t<len)

{

if(ciphers[t]==charr)

{

return true;

break;

}

else t++;

}

return false;

}

int main()

{

ofstream file3;

ofstream file4;

ch=65;

    temp[1]='\0';

    for(int i=0;i<26;i++)

{

ciphers[i]='\0';

filename[i]='\0';

}

for( i=0;i<11;i++)

{

keyword[i]='\0';

keywordweights[i]='\0';

    }

cout << "Enter Keyword(max characters 10 are allowed and all in upper case)";

    cin.getline(keyword,10);

len=strlen(keyword);

for(i=0;i<26;i++)

{

for(int h=0;h<strlen(keyword);h++)

{

if(keyword[h]==ch)

{   flag3=1;

itoa(wt,temp,10);

keywordweights[h]=temp[0];

temp[0]='\0';

wt++;

}

}

ch++;

}

cout<<"Keyword Entered:"<<keyword<<"\n";

ciphers[0]=keyword[0];

y++;

ch=65;

for( i=1;i<len;i++)

{   if(false==findchar(keyword[i]))

{ciphers[y]=keyword[i];

   y++;

}

}

for(i=0;i<26;i++)

{

     if(false==findchar(ch))

{ ciphers[y]=ch;

   y++;

}

ch++;

    }

ch=97;

for(i=0;i<26;i++)

{

plaincipher[i][0]=ch;

plaincipher[i][1]=ciphers[i];

ch++;

}

file4.open("ciphertable.txt");

cout<<"Cipher Table:\n";

for(i=0;i<26;i++)

{

cout<<plaincipher[i][0];

file4<<plaincipher[i][0];

}

cout<<"\n";

for(i=0;i<26;i++)

{

cout<<plaincipher[i][1];

file4<<plaincipher[i][1];

}

cout<<"\n";

   while(flag==0)

{

cout<<"Enter 'S' for Monoalphabetic Substitution Cipher and 'T' For Double Transposition Cipher:\n";

cin>>type;

if (type=='S')

flag=1;

    else if(type=='T')

flag=2;

if(flag==1)

{

cout<<"You Selected Monoalphabetic Substitution Cipher!\n";

 

break;

     }

else if(flag==2)

{

cout<<"You Selected Double Transposition Cipher!\n";

break;

     }

else

cout<<"Wrong Input\n";

   }

   if(flag==1)

   {

  while(flag1==0)

   {

  cout<<"Enter 'E' for Encryption And 'D' for Decryption:";

  cin>>ed;

if(ed=='E')

flag1=1;

else if(ed=='D')

flag1=2;

if (flag1==1 || flag1==2)

break;

else

cout<<"Wrong Input\n";

}

 

   if(flag1==1)

   {

  cout<<"Enter Name Of the File You Want to Encrypt:";

  cin>>filename;

   

cout<<"Name Of The File To Be Encrypted:"<<filename<<"\n";

ofstream file2;

file2.open("encryptedfile.txt");

file1.open(filename);

while (file1.good())     // loop while extraction from file is possible

{ l=0;

    c = file1.get();       // get character from file

while(plaincipher[l][0]!=c)

{ l++;

}

if(l<26)

file2<<plaincipher[l][1];

   // if (file1.good())

  //    cout << c;

}

  file1.close();           // close file

        cout<<" Cipher Table File is 'ciphertable.txt'\n";

  cout<<"Your File Has Been Encrypted and Encrypted Data Is Saved To File :"<<filename2<<"\n"; 

}

   if(flag1==2)

   {

  cout<<"Enter Name Of the File You Want to Dencrypt:";

  cin>>filename;

   

cout<<"Name Of The File To Be Dencrypted:"<<filename<<"\n";

ofstream file2("dencryptedfile.txt");

file1.open(filename);

while (file1.good())     // loop while extraction from file is possible

{ l=0;

    c = file1.get();       // get character from file

while(plaincipher[l][1]!=c)

{ l++;

}

if(l<26)

file2<<plaincipher[l][0];

   // if (file1.good())

  //    cout << c;

}

  file1.close();           // close file

        cout<<" Cipher Table File is 'ciphertable.txt'\n";

  cout<<"Your File Has Been Dencrypted and Dencrypted Data Is Saved To File :"<<filename3<<"\n"; 

}

   }

else if(flag==2)

{

cout<<"Weights Assiged To Keyword:";

for(int h=0;h<strlen(keyword);h++)

cout<<keywordweights[h];

   cout<<"\n";

while(flag1==0)

   {

  cout<<"Enter 'E' for Encryption And 'D' for Decryption:";

  cin>>ed;

if(ed=='E')

flag1=1;

else if(ed=='D')

flag1=2;

if (flag1==1 || flag1==2)

break;

else

cout<<"Wrong Input\n";

}

 

   if(flag1==1)

   {

  cout<<"Enter Name Of the File You Want to Encrypt:";

  cin>>filename;

   

cout<<"Name Of The File To Be Encrypted:"<<filename<<"\n";

ofstream file2("encryptedfile.txt");

file1.open(filename);

while (file1.good())     // loop while extraction from file is possible

{ l=0;

     c = file1.get();       // get character from file

count++;

}

file1.close();

count--;

mod=count%len;

while(mod!=0)

{

count++;

mod=count%len;

}

numofrows=count/len;

doubletrans=new char*[numofrows+1];

for( int i=0 ; i < numofrows+1 ; i++ )

    doubletrans[i] = new char[col];

for(i=0;i<len;i++)

doubletrans[0][i]=keywordweights[i];

file1.open(filename);

int rr=1;

while (file1.good())     // loop while extraction from file is possible

{ l=0;

     c = file1.get();       // get character from file

 

if(rr<numofrows+1 && col<len)

{doubletrans[rr][col]=c;

 col++;

 if(col==len)

 {

 rr++;

 col=0;

 }

}

}

col--;

while(col!=len)

{

doubletrans[rr][col]='X';

col++;

}

cout<<'\n';

file3.open("keymatrix.txt");

for(i=0;i<numofrows+1;i++)

{

for(int j=0;j<len;j++)

{ cout<<doubletrans[i][j];

   file3<<doubletrans[i][j];

}

cout<<'\n';

file3<<'\n';

}

//cout<<"rows:"<<numofrows<<'\n';

  file1.close();           // close file

  ind=1;

  

  for(int j=0;j<len;j++)

  {itoa(ind,temp,10);

 for(int i=0;i<len;)

 {

 if(doubletrans[0][i]!=temp[0])

 i++;

 else 

 {  ind++;

 break;

 }

 }

 for(int u=1;u<numofrows+1;u++)

 {cout<<doubletrans[u][i];

  file2<<doubletrans[u][i];

 }

 cout<<" ";

  }

        cout<<"Key Matrix File is 'keymatrix.txt' and Cipher Table File is 'ciphertable.txt'\n";

  cout<<"Your File Has Been Encrypted and Encrypted Data Is Saved To File :"<<filename2<<"\n"; 

}

   if(flag1==2)

   {

  

   decrypt();

}

}

return 0;

}

//****************************CPP FILE*************************************//www.google.com