Challenge Overview

You are working as a cryptographic engineer for Lektech Software Solutions in London. The company uses the AES-CBC mode of encryption algorithm to encrypt all their confidential data. Now the employee who is responsible for decrypting all the company's encrypted data has forgotten the IV, and he is asking for your help to decrypt all the data. As a cryptographic engineer, your task is to decrypt the company's data and submit it back to the employee. Your target is a Ciphertext message. To get the original plaintext message, you will have to crack the ciphertext message by performing various cryptographic attack techniques. By completing this task, you will gain hands-on experience in the area of cryptography. Note: - Download the file using the link http: //10.10.1.79

What You Will Learn

  • Demonstrating knowledge of Advanced Encryption Standard in CBC mode and the role of the Initialization Vector (IV).
  • Working with a partially known key and missing IV to analyze weaknesses in implementation.
  • Applying cryptographic reasoning and attack strategies to recover meaningful plaintext.
  • Using open-source intelligence and contextual clues to rebuild incomplete or partially decrypted messages.
  • Combining mathematical reasoning, logical deduction, and practical decryption methods to recover the original plaintext message.

Program Curriculum

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