Key Refine
Gagan G Saralaya
This is a Cyber Security mini project that takes a password from the user and enhances it by replacing letters with symbols and adding additional symbols, making it easy to remember and hard to crack. It saves both the new and old passwords in the system.
This program takes the password from the user and adds it into a stack (a) and uses a variable that holds the address of the stack. It randomly places a symbol at the beginning or the end of the new password. Using a while loop, the program goes through each letter of the password. It capitalizes the first letter. If there is a digit, it pushes it into the end stack. If it belongs to a list of letters, it calls the function hierarchy, which replaces the letters of the password and then pushes them into the end stack.
If it does not follow any of the above conditions, it just pushes the character into the stack. This program uses snprintf to run a PowerShell command that checks if the password.txt is saved in a specific location and appends it; otherwise, it creates a new file and saves the password.
This program is really useful for making a simple password a little more complex and easy to remember. Having a strong password is really important in today's world, as protecting data has become the primary concern for many people and corporations.
#include<stdio.h>
#include<stdlib.h>
#include<ctype.h>
#include<string.h>
#include<time.h>
#define MAX 100
int top=-1;
int stack[MAX];
int h;//randomizes if vowels or consonants are to be replaced
char return_a_num(int num){
return num+'0';
}
void checkh(){
h=rand()%2;
}
void push(int data)
{
if(top==MAX-1)
{
printf("Full");
}
else
{
top++;
stack[top]=data;
}
}
void pop(){
if(top==-1){
printf("Empty");
}
else{
top--;
}
}
void display(){
if(top==-1){
printf("Empty");
}
else{
for(int i=0;i<top+1;i++){
printf("%c",(char)stack[i]);
}
}
}
//checks for hierarchy and replaces with new password
char hierarchy(char a){
if(h==0){
if(a=='a'||a=='A'){
return '^';
}
else if(a=='e'||a=='E'){
return '@';
}
else if(a=='i'||a=='I'){
char b=return_a_num(1);
return b;
}
else if(a=='o'||a=='O'){
char b=return_a_num(0);
return b;
}
else if(a=='u'||a=='U'){
return ')';
}
else{
return a;
}
}
else{
if(a=='h'||a=='H'){
return '#';
}
else if(a=='e'||a=='E'){
char b;
b=return_a_num(3);
return b;
}
else if(a=='s' || a=='S'){
return '$';
}
else if(a=='d' || a=='D'){
return ']';
}
else if(a=='r' || a=='R'){
return '%';
}
else if(a=='l' || a=='L'){
return '<';
}
else if(a=='t' || a=='T'){
return '+';
}
else if(a=='m'||a=='M'){
return 'w';
}
else if(a=='w'||a=='W'){
return 'm';
}
else if(a=='c'||a=='C'){
return '(';
}
else if(a=='p'||a=='P'){
char b;
b=return_a_num(9);
return b;
}
else if(a=='b'||a=='B'){
char b;
b=return_a_num(8);
return b;
}
else if(a=='v'||a=='V'){
return '>';
}
else{
return a;
}
}
}
void seperator(){
int x;
x=rand()%5;
char g;
switch(x){
case 0:
g='.';
break;
case 1:
g='/';
break;
case 2:
g='?';
break;
case 3:
g='|';
break;
case 4:
g=':';
break;
default:
g='-';
break;
}
push(g);
}
int main()
{
printf("\nWelcome to the password generator");
printf("\n**********************************");
printf("\nThis program will generate a password for you and save it in a file");
srand(time(0));
char exp[100],*e,x;
printf("\nEnter the password:");
scanf("%s",exp);
e=exp;
int r=0;
int begorend=rand()%2;
if(begorend==0){
seperator();
}
checkh();
while(*e!='\0'){
//change 1st letter to uppercase
if(*e != 'a' && *e != 'e' && *e != 'i' && *e != 'o' && *e != 'u' &&
*e != 'h' && *e != 'e' && *e != 's' && *e != 'd' && *e != 'r' &&
*e != 'l' && *e != 't' && *e != 'A' && *e != 'E' && *e != 'I' &&
*e != 'O' && *e != 'U' && *e != 'H' && *e != 'E' && *e != 'S' &&
*e != 'D' && *e != 'R' && *e != 'L' && *e != 'T'&& *e!='m'&& *e!='w'
&& *e!='c'&& *e!='p'&& *e!='b'&& *e!='v'&&*e!='M'&& *e!='W' && *e!='C'&& *e!='P'&& *e!='B'&& *e!='V'
&&r==0 && islower(*e))
{
char f=*e-32;
push(f);
r=1;
}
//push number
else if(isdigit(*e)){
push(*e);
}
//change and push special characters
else if (*e == 'a' || *e == 'e' || *e == 'i' || *e == 'o' || *e == 'u' ||
*e == 'h' || *e == 'e' || *e == 's' || *e == 'd' || *e == 'r' ||
*e == 'l' || *e == 't' || *e == 'A' || *e == 'E' || *e == 'I' ||
*e == 'O' || *e == 'U' || *e == 'H' || *e == 'E' || *e == 'S' ||
*e == 'D' || *e == 'R' || *e == 'L' || *e == 'T')
{
char d=hierarchy(*e);
push(d);
}
else{
push(*e);
}
e++;
}
if(begorend==1){
seperator();
}
printf("\nNew password generated:");
display();
for(int i=0;i<top+1;i++){
x=(char)stack[i];
//printf("%c",x);
}
// Convert stack to a string
char stack_str[MAX + 1];
for(int i=0; i<=top; i++){
stack_str[i] = (char)stack[i];
}
stack_str[top + 1] = '\0'; // Null-terminate the string
char finalpassword[1000];
strcpy(finalpassword,exp);
strcat(finalpassword,"=");
strcat(finalpassword,stack_str);
char command[1000];
char name[1000];
printf("\nEnter the name of the file for the filepath:");
scanf("%s",name);
snprintf(command, sizeof(command),
"powershell -Command \"if (!(Test-Path 'C:\\\\Users\\\\%s\\\\cool_password.txt')) { "
"New-Item -Path 'C:\\\\Users\\\\%s\\\\cool_password.txt' -ItemType File }; "
"Add-Content -Path 'C:\\\\Users\\\\%s\\\\cool_password.txt' -Value '%s'\"",
name,name,name,finalpassword);
int ret=system(command);
if(ret==0){
printf("\nPassword saved successfully in C:\\Users\\%s\\cool_password.txt",name);
printf("\nPassword: %s",finalpassword);
}
else{
printf("\nPassword not saved in C:\\Users\\%s\\cool_password.txt",name);
}
return 0;
}
Here are the outputs.
This is what is saved in the text file.
password=/pa$$wo%] king=|K1ng password=pa$$wo%]. password=|p^ssw0rd new_password=N@w_p^ssw0rd. new_password=current_password+coolness=N3w_pa$$wo%]=cu%%3n+_pa$$wo%]+coo<n3$$/ cool+password=coo<+pa$$wo%]|
Hope you learnt something new from this blog.
Happy Coding…
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