Ed25519 Signature Tool
High-performance EdDSA digital signatures using Curve25519
Key Generation
Generate a new Ed25519 key pair (32-byte private key + 32-byte public key)
Derive Public Key
Derive public key from an existing private key
About Ed25519
Ed25519 is a modern, high-performance digital signature algorithm based on the Edwards-curve Digital Signature Algorithm (EdDSA) using Curve25519. Designed by Daniel J. Bernstein, Ed25519 offers strong security guarantees while being significantly faster than traditional algorithms like RSA and ECDSA.
Key Features
- High Performance: Ed25519 is extremely fast for both signing and verification, making it ideal for high-throughput applications.
- Small Keys: 256-bit keys provide security equivalent to RSA-3072, with much smaller key sizes (32 bytes vs 384 bytes).
- Deterministic Signatures: Unlike ECDSA, Ed25519 generates deterministic signatures, eliminating risks from poor random number generation.
- Resistance to Side-Channel Attacks: The algorithm is designed to be resistant to timing attacks and other side-channel vulnerabilities.
- No Secret Nonces: Ed25519 doesn't require a secret nonce for signing, simplifying implementation and improving security.
Technical Specifications
- Curve: Twisted Edwards curve (Curve25519)
- Private Key Size: 32 bytes (256 bits)
- Public Key Size: 32 bytes (256 bits)
- Signature Size: 64 bytes (512 bits)
- Security Level: ~128-bit security (equivalent to RSA-3072)
- Standard: RFC 8032 (Edwards-Curve Digital Signature Algorithm)
Common Use Cases
- SSH Authentication: Ed25519 is the recommended algorithm for SSH keys due to its security and performance.
- TLS/SSL Certificates: Modern TLS 1.3 supports Ed25519 for certificate signatures.
- Cryptocurrency: Used in Solana, Cardano, and other blockchain platforms for transaction signing.
- Software Signing: Code signing, package signing (minisign), and firmware verification.
- API Authentication: Secure API request signing and verification.
Security Best Practices
- Protect Private Keys: Never share or expose your private key. Store it securely and use hardware security modules (HSM) for critical applications.
- Verify Public Keys: Always verify public keys through a trusted channel to prevent man-in-the-middle attacks.
- Client-Side Processing: This tool runs entirely in your browser. Your private keys never leave your device.
- Key Rotation: Regularly rotate keys for long-lived applications to limit the impact of potential key compromise.
Ed25519 vs Other Algorithms
| Feature | Ed25519 | RSA-2048 | ECDSA P-256 |
|---|---|---|---|
| Key Size | 32 bytes | 256 bytes | 32 bytes |
| Signature Size | 64 bytes | 256 bytes | 64 bytes |
| Sign Speed | Very Fast | Slow | Fast |
| Verify Speed | Very Fast | Fast | Moderate |
| Deterministic | Yes | Yes | No (needs nonce) |
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