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- import java.util.*;
- class VaultDoor3 {
- public static void main(String args[]) {
- VaultDoor3 vaultDoor = new VaultDoor3();
- Scanner scanner = new Scanner(System.in);
- System.out.print("Enter vault password: ");
- String userInput = scanner.next();
- String input = userInput.substring("picoCTF{".length(),userInput.length()-1);
- if (vaultDoor.checkPassword(input)) {
- System.out.println("Access granted.");
- } else {
- System.out.println("Access denied!");
- }
- }
- // Our security monitoring team has noticed some intrusions on some of the
- // less secure doors. Dr. Evil has asked me specifically to build a stronger
- // vault door to protect his Doomsday plans. I just *know* this door will
- // keep all of those nosy agents out of our business. Mwa ha!
- //
- // -Minion #2671
- public boolean checkPassword(String password) {
- if (password.length() != 32) {
- return false;
- }
- char[] buffer = new char[32];
- int i;
- for (i=0; i<8; i++) {
- buffer[i] = password.charAt(i);
- }
- for (; i<16; i++) {
- buffer[i] = password.charAt(23-i);
- }
- for (; i<32; i+=2) {
- buffer[i] = password.charAt(46-i);
- }
- for (i=31; i>=17; i-=2) {
- buffer[i] = password.charAt(i);
- }
- String s = new String(buffer);
- return s.equals("jU5t_a_sna_3lpm1dg347_u_4_mfr54b");
- }
- }
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