Easy DSA — GPN CTF 2026
A P-521 ECDSA oracle derives its nonce from an MD5-based uuid3, so an MD5 collision forces nonce reuse, leaks the private key, and lets us forge a signature for the flag.
Ecdsa
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A P-521 ECDSA oracle derives its nonce from an MD5-based uuid3, so an MD5 collision forces nonce reuse, leaks the private key, and lets us forge a signature for the flag.