Password Gen Algorithm
A random password generator is software plan or hardware device that takes input from a random or pseudo-random number generator and automatically generates a password. While there are many examples of" random" password generator programs available on the internet, generate randomness can be tricky and many programs do not generate random characters in a manner that ensures strong security.
package Others;
import java.util.Collections;
import java.util.Random;
import java.util.List;
import java.util.ArrayList;
/**
* Creates a random password from ASCII letters
* Given password length bounds
*
* @author AKS1996
* @date 2017.10.25
*/
class PasswordGen {
public static void main(String args[]) {
String password = generatePassword(8, 16);
System.out.print("Password: " + password);
}
static String generatePassword(int min_length, int max_length) {
Random random = new Random();
String upper = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
String lower = "abcdefghijklmnopqrstuvwxyz";
String numbers = "0123456789";
String specialChars = "!@#$%^&*(){}?";
String allChars = upper + lower + numbers + specialChars;
List<Character> letters = new ArrayList<Character>();
for (char c : allChars.toCharArray())
letters.add(c);
// Inbuilt method to randomly shuffle a elements of a list
Collections.shuffle(letters);
String password = "";
// Note that size of the password is also random
for (int i = random.nextInt(max_length - min_length) + min_length; i > 0; --i) {
password += letters.get(random.nextInt(letters.size()));
}
return password;
}
}
