Generate Ed25519 SSH Online

ED25519 SSH Key Generator

This free and open-source tool allows you to easily generate ED25519 SSH key pairs. ED25519 is a modern, secure, and efficient public-key signature system that offers several advantages over older algorithms.

What is an ED25519 SSH Key?

ED25519 is an elliptic curve signature scheme that offers a high level of security and performance. It's becoming increasingly popular for SSH authentication due to its:

  • Strong security (equivalent to RSA 3072-bit)
  • Fast key generation and signature verification
  • Small key size (public key is only 32 bytes)
  • Resistance to side-channel attacks

How to Use

  1. Click the "Generate Key Pair" button.
  2. The tool will generate a new ED25519 key pair.
  3. The public and private keys will be displayed in the respective output boxes.
  4. Click the "Copy" buttons to copy the keys to your clipboard.

Features

  • Secure ED25519 key pair generation
  • One-click generation process
  • Separate display of public and private keys
  • Copy-to-clipboard functionality for both keys

Use Cases

  • Secure SSH authentication for servers and services
  • Git repository access (e.g., GitHub, GitLab)
  • Secure file transfer using SFTP
  • Automated server management and deployment scripts

How It Works

The tool uses a cryptographically secure random number generator to create the ED25519 key pair. The process involves:

  1. Generating a random 32-byte (256-bit) private key
  2. Using the ED25519 algorithm to derive the corresponding 32-byte public key
  3. Encoding the keys in the appropriate format for SSH use

Privacy and Security

This tool performs all key generation operations directly in your browser. No data is sent to any external server, ensuring that your keys remain private and secure.

Note

While ED25519 keys are highly secure, it's crucial to keep your private key confidential. Never share your private key, and store it securely. The public key can be freely shared and added to services for authentication.