| 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_3lpm18g947_u_4_m9r54f"); | |
| } | |
| } | |