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AI Engineering
Lobsters·1d ago·5 min read
Lobsters·1d ago·5 min readHow the L0pht (probably) optimized attack against the LanMan hash
TL;DR
L0pht Heavy Industries optimized password recovery for the LanMan hash, achieving a 450% speed increase in their tool L0phtCrack. This was accomplished through various techniques, including precomputing key schedules and using macros for the key schedule algorithm.
✦ Why It Matters
Evaluate your password hashing methods and consider transitioning to more secure algorithms.
Key Takeaways
- Review and update legacy password hashing algorithms.
- Implement precomputation techniques for cryptographic operations.
- Utilize macros to enhance performance in cryptographic functions.
- Consider the implications of fixed plaintext in encryption algorithms.
How It Works
L0phtCrack's optimization involved precomputing DES key schedules, allowing for faster key generation during brute force attacks. By leveraging the predictable structure of the LanMan hash, they could efficiently generate and test keys, significantly increasing the number of keys processed per second.