Analyzing Malicious Activity through Collision Attacks on SHA-1

precious

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Apr 22, 2024
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As part of Objective 2.4 (analyzing indicators of malicious activity), collision attacks on broken cryptographic algorithms, like SHA-1, are critical examples of tampering threats.

Key Takeaways:​

  • Collision Attack: When two distinct inputs generate the same hash, indicating possible tampering or forgery.
  • Broken SHA-1: SHA-1 is deprecated due to collision vulnerability, making it possible for attackers to create identical hashes for malicious files.

Practical Demo:​

  1. Demonstration: Use the website, which showcases a real-world collision attack on SHA-1. It provides two PDF files that generate the same SHA-1 hash, but contain different content.
  2. Verification: Have students download the example files from and use Python on https://github.com/OffensiveSoldier/Collision-attack/tree/main to hash them, demonstrating the collision.
  3. Discussion: Analyze how collision attacks can be used in malicious activities, such as bypassing digital signatures or integrity checks.
 
As part of Objective 2.4 (analyzing indicators of malicious activity), collision attacks on broken cryptographic algorithms, like SHA-1, are critical examples of tampering threats.

Key Takeaways:​

  • Collision Attack: When two distinct inputs generate the same hash, indicating possible tampering or forgery.
  • Broken SHA-1: SHA-1 is deprecated due to collision vulnerability, making it possible for attackers to create identical hashes for malicious files.

Practical Demo:​

  1. Demonstration: Use the website, which showcases a real-world collision attack on SHA-1. It provides two PDF files that generate the same SHA-1 hash, but contain different content.
  2. Verification: Have students download the example files from and use Python on https://github.com/OffensiveSoldier/Collision-attack/tree/main to hash them, demonstrating the collision.
  3. Discussion: Analyze how collision attacks can be used in malicious activities, such as bypassing digital signatures or integrity checks.
@precious Thanks for the insight this is very important information
 
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