Trust Games

The challenge uses a LCG to generate plaintext, key and IV. To receive the flag we must present the AES-CBC encrypted plaintext given the key and IV, only we don’t know the key. The LCG resets a new state every 16 states (from the refresh function). Observing the code, we can learn that: The last 8 bytes of the plaintext and the first 8 bytes of the key are derived from some 16 consecutive states The last 8 bytes of the key and the first 8 bytes of the IV are derived from some 16 consecutive states....