Cybersecurity · Postgraduate · Production ECC

ECC workbench · secp256k1.

Not a toy. This is the real curve — the exact 256-bit secp256k1 used by Bitcoin, Ethereum and TLS — with genuine field arithmetic, key generation, ECDH key agreement and ECDSA signatures verified against SHA-256. The private keys are drawn from the browser's cryptographic RNG. Nothing here is scaled down.

y² = x³ + 7 over 𝔽ₚ, p = 2²⁵⁶ − 2³² − 977. Generator order n ≈ 1.16 × 10⁷⁷ — a 256-bit prime.

1 Key generation · Q = d·G

private key d (256-bit, secret)

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public key Q = d·G (compressed, 33 bytes)

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scalar multiplications performed (double-and-add)

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2 ECDH · shared secret without ever sending d

Alice public

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Bob public

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Alice computes d_A · Q_B

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Bob computes d_B · Q_A

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3 ECDSA · sign & verify over SHA-256

message

SHA-256(message) → z

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signature r

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signature s

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