rev: add a few more challenges

rev/safe_opener/SafeOpener.java

@@ -0,0 +1,42 @@
+import java.io.*;
+import java.util.*;
+public class SafeOpener {
+    public static void main(String args[]) throws IOException {
+        BufferedReader keyboard = new BufferedReader(new InputStreamReader(System.in));
+        Base64.Encoder encoder = Base64.getEncoder();
+        String encodedkey = "";
+        String key = "";
+        int i = 0;
+        boolean isOpen;
+
+
+        while (i < 3) {
+            System.out.print("Enter password for the safe: ");
+            key = keyboard.readLine();
+
+            encodedkey = encoder.encodeToString(key.getBytes());
+            System.out.println(encodedkey);
+
+            isOpen = openSafe(encodedkey);
+            if (!isOpen) {
+                System.out.println("You have  " + (2 - i) + " attempt(s) left");
+                i++;
+                continue;
+            }
+            break;
+        }
+    }
+
+    public static boolean openSafe(String password) {
+        String encodedkey = "cGwzYXMzX2wzdF9tM18xbnQwX3RoM19zYWYz";
+
+        if (password.equals(encodedkey)) {
+            System.out.println("Sesame open");
+            return true;
+        }
+        else {
+            System.out.println("Password is incorrect\n");
+            return false;
+        }
+    }
+}

rev/safe_opener/flag.txt

@@ -0,0 +1,3 @@
+# NOTE: password in source code is base64 encoded
+
+picoCTF{pl3as3_l3t_m3_1nt0_th3_saf3}