Challenge Overview

As part of a cybersecurity interview, you are given a CTF challenge focused on exploiting a Python-based login system. Analyze the authentication logic, identify cryptographic weaknesses, and apply appropriate attack techniques to bypass security controls. Your goal is to exploit the flaw and retrieve the hidden flag.

What You Will Learn

  • Understanding block cipher fundamentals, particularly how AES works and the structural weaknesses of ECB (Electronic Codebook) mode.
  • Recognizing why AES-ECB is insecure, specifically that identical plaintext blocks produce identical ciphertext blocks, enabling pattern leakage.
  • Analyzing and interpreting Python socket-based authentication code, identifying logical and cryptographic flaws in the implementation.
  • Crafting a chosen-plaintext or block-manipulation attack to construct a valid encrypted password without knowing the secret key.
  • Applying practical cryptographic exploitation techniques to bypass authentication and retrieve the flag from the server.

Program Curriculum

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