ECC Key Pair Generator & ECDSA Tool - Elliptic Curve Cryptography Online

ECC Key Pair Generator & ECDSA Tool

Generate elliptic curve key pairs, sign and verify messages with ECDSA, and perform ECDH key exchange. Supports multiple curves.

100% Client-Side Processing
Key Pair Generation

Used in TLS, certificates, and enterprise security - 128-bit security

Private Key (HEX)
Public Key (HEX)
ECDSA Signing
ECDSA Signature (HEX)
ECDSA Verification

Verification Result

Enter the public key, message, and signature to verify.

ECDH Key Exchange

Elliptic Curve Diffie-Hellman (ECDH) key exchange allows two parties to establish a shared secret over an insecure channel.

Party A (Your Side)

Your Public Key (Share with Party B)

Party B (Other Side)

Shared Secret

ECDSA vs RSA - Cryptographic Comparison

ECDSA and RSA are both widely used public-key cryptographic algorithms, but they differ significantly in performance, key size, and security characteristics.

Aspect ECDSA (Elliptic Curve) RSA
Cryptographic Basis Elliptic Curve Discrete Logarithm Problem (ECDLP) Integer Factorization Problem
Key Size (~128-bit security) 256-bit 3072-bit
Signature Size ~64 bytes 256-384 bytes
Performance Fast signing, fast verification Slow signing, fast verification
Security per Bit High Lower compared to ECC
Common Use Cases Blockchain, TLS, WebAuthn, IoT Legacy systems, enterprise PKI
Modern Recommendation Strongly recommended Acceptable for legacy

Key Pair Generation

ECC key pairs consist of a private key (a random large number) and a public key (a point on the elliptic curve derived from the private key).

// Generate P-256 key pair (JavaScript) const keyPair = await crypto.subtle.generateKey( { name: 'ECDSA', namedCurve: 'P-256' }, true, ['sign', 'verify'] ); // Export public key const publicKey = await crypto.subtle.exportKey('raw', keyPair.publicKey);
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