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+# scarymaze
+
+"I tried to get to level 489, but I was too scared."
+
+I was hoping that the strings from OpenSSL would make it fairly easy to
+determine the behavior of the following function, but that was not the case. No
+one had solved the challenge until it was re-released with symbols included.
+
+```rust
+fn my_encrypt(packet: &[u8]) -> Vec<u8> {
+    let mut rng = rand::thread_rng();
+    let mut iv = [0 as u8; 16];
+    rng.fill_bytes(&mut iv);
+
+    let cipher = Cipher::aes_128_cbc();
+    let key = AES_KEY.as_bytes();
+    let mut data = encrypt(cipher, key, Some(&iv), packet).unwrap();
+
+    let mut ciphertext = Vec::from(iv);
+    ciphertext.append(&mut data);
+    ciphertext
+}
+```
+
+Once you realized that the network traffic was being encrypted with AES-128-CBC,
+you could capture packet traces and decrypt it. The packet format was designed
+to be simple enough that be reverse engineered from packet traces and client
+interaction alone.
+
+Then, you were to write your own client which would solve the mazes for you. The
+server would give you the flag when you had reached level 489.
+
+Solving mazes can be done with an
+[algorithm](https://en.wikipedia.org/wiki/Depth-first_search) usually introduced
+within the first month of a university computer science program.