Rail Fence Cipher Program in C and C++[Encryption & Decryption]

Here you will get rail fence cipher program in C and C++ for encryption and Decryption.

It is a sort of transposition cipher which is otherwise called crisscross cipher. The following is an example.

Here Key = 3. For encryption, we compose the message slantingly in crisscross structure in

a framework having all outlines = key and all-out sections = message length. At that point read the

grid push savvy on a level plane to get the encrypted message.

Rail Fence Cipher Program in C

#include<stdio.h>
#include<string.h>
 
void encryptMsg(char msg[], int key){
    int msgLen = strlen(msg), i, j, k = -1, row = 0, col = 0;
    char railMatrix[key][msgLen];
 
    for(i = 0; i < key; ++i)
        for(j = 0; j < msgLen; ++j)
            railMatrix[i][j] = '\n';
 
    for(i = 0; i < msgLen; ++i){
        railMatrix[row][col++] = msg[i];
 
        if(row == 0 || row == key-1)
            k= k * (-1);
 
        row = row + k;
    }
 
    printf("\nEncrypted Message: ");
 
    for(i = 0; i < key; ++i)
        for(j = 0; j < msgLen; ++j)
            if(railMatrix[i][j] != '\n')
                printf("%c", railMatrix[i][j]);
}
 
void decryptMsg(char enMsg[], int key){
    int msgLen = strlen(enMsg), i, j, k = -1, row = 0, col = 0, m = 0;
    char railMatrix[key][msgLen];
 
    for(i = 0; i < key; ++i)
        for(j = 0; j < msgLen; ++j)
            railMatrix[i][j] = '\n';
 
    for(i = 0; i < msgLen; ++i){
        railMatrix[row][col++] = '*';
 
        if(row == 0 || row == key-1)
            k= k * (-1);
 
        row = row + k;
    }
 
    for(i = 0; i < key; ++i)
        for(j = 0; j < msgLen; ++j)
            if(railMatrix[i][j] == '*')
                railMatrix[i][j] = enMsg[m++];
 
    row = col = 0;
    k = -1;
 
    printf("\nDecrypted Message: ");
 
    for(i = 0; i < msgLen; ++i){
        printf("%c", railMatrix[row][col++]);
 
        if(row == 0 || row == key-1)
            k= k * (-1);
 
        row = row + k;
    }
}
 
int main(){
    char msg[] = "Hello World";
    char enMsg[] = "Horel ollWd";
    int key = 3;
 
    printf("Original Message: %s", msg);
 
    encryptMsg(msg, key);
    decryptMsg(enMsg, key);
 
    return 0;
}

Output

Original Message: Hello World
Encrypted Message: Horel ollWd
Decrypted Message: Hello World

Rail Fence Cipher Program in C++

#include<iostream>
#include<string.h>
 
using namespace std;
 
void encryptMsg(char msg[], int key){
    int msgLen = strlen(msg), i, j, k = -1, row = 0, col = 0;
    char railMatrix[key][msgLen];
 
    for(i = 0; i < key; ++i)
        for(j = 0; j < msgLen; ++j)
            railMatrix[i][j] = '\n';
 
    for(i = 0; i < msgLen; ++i){
        railMatrix[row][col++] = msg[i];
 
        if(row == 0 || row == key-1)
            k= k * (-1);
 
        row = row + k;
    }
 
    cout<<"\nEncrypted Message: ";
 
    for(i = 0; i < key; ++i)
        for(j = 0; j < msgLen; ++j)
            if(railMatrix[i][j] != '\n')
                cout<<railMatrix[i][j];
}
 
void decryptMsg(char enMsg[], int key){
    int msgLen = strlen(enMsg), i, j, k = -1, row = 0, col = 0, m = 0;
    char railMatrix[key][msgLen];
 
    for(i = 0; i < key; ++i)
        for(j = 0; j < msgLen; ++j)
            railMatrix[i][j] = '\n';
 
    for(i = 0; i < msgLen; ++i){
        railMatrix[row][col++] = '*';
 
        if(row == 0 || row == key-1)
            k= k * (-1);
 
        row = row + k;
    }
 
    for(i = 0; i < key; ++i)
        for(j = 0; j < msgLen; ++j)
            if(railMatrix[i][j] == '*')
                railMatrix[i][j] = enMsg[m++];
 
    row = col = 0;
    k = -1;
 
    cout<<"\nDecrypted Message: ";
 
    for(i = 0; i < msgLen; ++i){
        cout<<railMatrix[row][col++];
 
        if(row == 0 || row == key-1)
            k= k * (-1);
 
        row = row + k;
    }
}
 
int main(){
    char msg[] = "Hello World";
    char enMsg[] = "Horel ollWd";
    int key = 3;
 
    cout<<"Original Message: "<<msg;
 
    encryptMsg(msg, key);
    decryptMsg(enMsg, key);
    
    return 0;
}

Remark underneath on the off chance that you have questions identified with above rail fence cipher program in C and C++.