Encryption/Decryption - File Operations Source Code in C

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Home » C Home » File Operations Home » Encryption/Decryption

A D V E R T I S E M E N T

Title	Encryption/Decryption
Author	Nagarajan.M
Author Email	nagarajan_cse [at] hotmail.com
Description	This program encrypt and Decrypt a given input file.
Category	C » File Operations
Hits	390741
Code	Select and Copy the Code
#include<stdio.h> void main() { FILE fp,fp1; int choi; char name[20],temp[20]={"Temp.txt"},c; clrscr(); printf(" Press 1 to Encrypt: Press 2 to Decrypt"); printf(" Enter your Choice:"); scanf("%d",&choi); switch(choi) { case 1: printf("Enter the filename to Encrypt:"); scanf("%s",name); fp=fopen(name,"r+"); if(fp==NULL) { printf("The file %s can't be open",name); getch(); exit(); } fp1=fopen(temp,"w+"); if(fp1==NULL) { printf("The file Temp can't be open"); getch(); exit(); } c=fgetc(fp); while(c!=EOF) { fputc((c+name[0]),fp1);printf("%c",c+name[0]);getch(); c=fgetc(fp); } fclose(fp); fclose(fp1); remove(name); rename(temp,name); printf("The file is Encrypted:"); getch(); break; case 2: printf(" Enter the Filename to Decrypt:"); scanf("%s",name); fp=fopen(name,"r+"); fp1=fopen(temp,"w+"); c=fgetc(fp); while(c!=EOF) { fputc(c-name[0],fp1); c=fgetc(fp); } fclose(fp); fclose(fp1); remove(name); rename(temp,name); printf("The file is decrypted:"); getch(); } }

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