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3 articles with this tag.
ECDH lets two parties agree on a shared secret using points on an elliptic curve. Learn how P-256, P-384, and secp256k1 define the group, how public keys are encoded and validated, why the secret is only an x coordinate, and how an invalid-curve attack works.
23 min read
ECDSA is the elliptic curve version of DSA, used to sign TLS handshakes and Bitcoin transactions. Learn how signing and verifying work, why a repeated nonce reveals the private key, how RFC 6979 removes that risk, and how a signature is encoded.
23 min read
X25519 is the Diffie-Hellman function on Curve25519, defined in RFC 7748. Learn how a 32-byte private key is clamped, how the Montgomery ladder multiplies a point using only its u coordinate, why the curve was chosen, and what the all-zero check protects against.
18 min read
