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A complete writeup of the BlackHat 2025 crypto CTF challenges, including Hatagawa-II and Whack-A-Scratch. We break custom cryptographic schemes and reverse engineering puzzles to recover flags, with detailed analysis.
Whack-a-scratch
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- web (5)
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whack-a-scratch (2)
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- writeup (2)
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- rce (2)
- hatagawa (1)
- hatagawa-ii (1)
- cryptography (1)
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- ctf-writeup (1)
- flagyard (1)
- codecon (1)
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