Challenge Information
Name: QLotto
Category: Quantum
Difficulty: Easy
Host: 83.136.252.32:31179
Challenge Description
"They call it QLotto - a dazzling new quantum lottery table provided by Qubitrix that lauders millions at the casino, where quantum draws decide your fate. If you can predict their draws, you can beat the system and clean out their coffers. Rig the jackpot, Operative. Every stolen coin funds their empire - and every coin you steal funds our fight."
Initial Reconnaissance
Analyzing the Provided Files
The challenge provides a single file: server.py. Let's examine its contents:
cat server.py
The server implements a quantum lottery system using Qiskit (IBM's quantum computing framework). Key observations:
Quantum Circuit: Uses 2 qubits (indices 0 and 1)
Initial State: Qubit 0 starts in superposition via
circuit.h(0)User Input: Players provide quantum gate instructions
Measurement: Both qubits are measured 36 times
Number Generation: 6 lottery numbers are extracted from the measurements
Understanding the Code Flow
def generate_circuit(self, instructions: str):
circuit = QuantumCircuit(2)
circuit.h(0) # Qubit 0 in superposition
instructions = instructions.split(";")
for instr in instructions:
parts = instr.split(":")
gate, params = parts
params = [ int(p) for p in params.split(",") ]
# CRITICAL VALIDATION
if any(p == 0 for p in params):
print("[Dealer] Hey, don't tamper with the house card — that's forbidden.")
return None
Key Restriction: The validation if any(p == 0 for p in params) prevents us from using index 0 in our gate parameters.
