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Practical No 7

The document provides a C program that implements the Rail Fence encryption technique for text. It includes a function to encrypt plaintext by arranging characters in a zigzag pattern across a specified number of rails. The main function handles user input for the text and the number of rails, then calls the encryption function to display the encrypted text.

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13 views2 pages

Practical No 7

The document provides a C program that implements the Rail Fence encryption technique for text. It includes a function to encrypt plaintext by arranging characters in a zigzag pattern across a specified number of rails. The main function handles user input for the text and the number of rails, then calls the encryption function to display the encrypted text.

Uploaded by

sahilpawar07704
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Practical No.

7
* Implement rail fence encryption technique to perform encryption of text
using C programming language
Program:-

#include <stdio.h>
#include <string.h>
// Function to encrypt plaintext using Rail Fence Cipher
void railFenceEncrypt(char *text, int rails) {
int len = strlen(text);
char rail[rails][len]; // Create an array of rails
memset(rail, '\n', sizeof(rail)); // Initialize the array with newline characters
int row = 0, col = 0;
int direction = 1; // 1 for moving down, -1 for moving up
// Fill the rail array in a zigzag pattern
for (int i = 0; i < len; i++) {
rail[row][col++] = text[i];
// Change direction when reaching the top or bottom rail
if (row == 0) {
direction = 1; // Move down
}
if (row == rails - 1) {
direction = -1; // Move up
}
// Move up or down
row += direction;
}
// Read the ciphertext row by row
printf("Encrypted Text: ");
for (int i = 0; i < rails; i++) {
for (int j = 0; j < len; j++) {
if (rail[i][j] != '\n') {
printf("%c", rail[i][j]);
}
}
}
printf("\n");
}

int main() {
char text[100];
int rails;
// Input plaintext and number of rails
printf("Enter the text to encrypt: ");
fgets(text, sizeof(text), stdin);
text[strcspn(text, "\n")] = 0; // Remove newline character from input
printf("Enter the number of rails: ");
scanf("%d", &rails);
// Encrypt the text
railFenceEncrypt(text, rails);
return 0;
}

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