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Ed25519 Key Generator

Generate Ed25519 key pairs, sign messages, and verify digital signatures. All processing is done client-side — your keys never leave your browser.

Generate Key Pair

Want a deeper dive into the concepts behind this tool? RSA vs Ed25519: Asymmetric Cryptography and Digital Signatures Explained

What is Ed25519?

Ed25519 is a high-performance digital signature algorithm based on the Edwards-curve Digital Signature Algorithm (EdDSA) using Curve25519. It was designed by Daniel J. Bernstein, Niels Duif, Tanja Lange, Peter Schwabe, and Bo-Yin Yang. Ed25519 provides 128-bit security level, making it suitable for a wide range of cryptographic applications.

Ed25519 is widely used in SSH keys, TLS certificates, blockchain systems, and various authentication protocols. It offers fast key generation, signing, and verification while maintaining a small key and signature size (32 bytes for keys, 64 bytes for signatures).

Unlike RSA or ECDSA, Ed25519 is resistant to many common implementation pitfalls such as timing attacks and weak random number generators, because signing is deterministic — it does not require a random nonce.

How to Use the Ed25519 Key Generator

Generate Tab:Click "Generate Key Pair" to create a new Ed25519 public/private key pair. Both keys are displayed in Hex and Base64 formats.
Sign Tab:Enter your private key (Hex) and a message, then click "Sign" to produce a digital signature.
Verify Tab:Enter the public key (Hex), message, and signature (Hex), then click "Verify" to check if the signature is valid.
Use the copy buttons to easily copy keys, signatures, or other outputs.
All operations are performed entirely in your browser — no data is sent to any server.

Algorithm specification

Standards status and recommended parameters for every algorithm exposed by this tool. Use this as a quick cheat sheet when deciding what to pick for a new project.

Ed25519RFC 8032

Status: Recommended. Fast, small keys, no parameter pitfalls.

Output: 32-byte pubkey, 64-byte signature

Note: Default for SSH, new signing protocols, blockchain (Solana, Cardano).

Frequently Asked Questions

Q: Is Ed25519 secure enough for production use?

Yes. Ed25519 provides a 128-bit security level and is widely adopted in production systems including OpenSSH, GnuPG, Signal Protocol, and many blockchain platforms. It is considered one of the most secure and efficient digital signature algorithms available today.

Q: Are my private keys safe when using this tool?

Yes. All key generation, signing, and verification happen entirely in your browser using the Web Crypto API. No keys, messages, or signatures are ever transmitted to any server. However, you should still handle private keys with care and never share them publicly.

Q: What is the difference between Ed25519 and ECDSA?

Both are elliptic curve signature algorithms, but Ed25519 uses the twisted Edwards curve (Curve25519) while ECDSA typically uses curves like P-256. Ed25519 offers deterministic signing (no random nonce needed), faster performance, and resistance to common implementation bugs that can compromise ECDSA.

Q: What are the key and signature sizes?

Ed25519 private keys are 32 bytes (64 hex characters), public keys are 32 bytes (64 hex characters), and signatures are 64 bytes (128 hex characters). This compact size is one of Ed25519's advantages over RSA, which typically requires 2048-4096 bit keys.

Q: Can I use Ed25519 keys generated here for SSH?

The raw Ed25519 key pairs generated here are cryptographically valid, but SSH uses a specific key format (OpenSSH or PEM). You would need to convert the raw keys to the appropriate format. For SSH key generation, it is recommended to use the ssh-keygen -t ed25519 command.

Q: Why is Ed25519 signing deterministic?

Ed25519 derives the nonce from the message and private key using a hash function, rather than using a random number generator. This eliminates the risk of nonce reuse — a vulnerability that famously compromised Sony's PlayStation 3 ECDSA implementation and leaked private keys.

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Read More

RSA vs Ed25519: Asymmetric Cryptography and Digital Signatures Explained11 min read