cryptoPromedium

Abnormal Ellipse

tamuctf

Task: ECDH key exchange on custom elliptic curve with AES-CBC encryption. Solution: Curve is anomalous (order = p), solved ECDLP via Smart's attack using p-adic lifting to recover private key and decrypt flag.

$ ls tags/ techniques/
aes_cbceccecdlpecdhanomalous_curvepadic
smart_attacksssa_attackpadic_liftingecdh_shared_secret_recovery
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