| Feature | Ed25519 | RSA |
|---|---|---|
| Algorithm Type | Elliptic Curve Digital Signature | Rivest–Shamir–Adleman (asymmetric encryption) |
| Key Length | Fixed at 256 bits | 1024 to 4096 bits (commonly 2048 or 4096) |
| Security Level | Stronger per bit (equivalent to ~3072-bit RSA) | Weaker per bit, needs longer keys |
| Speed | Faster in both signing and verification | Slower, especially with longer keys |
| Key Size (File) | Very small (a few hundred bytes) | Large, can be several kilobytes |
| Compatibility | Supported in OpenSSH ≥ 6.5 (2014+) | Universally supported |
| Quantum Resistance | ❌ Not quantum-resistant | ❌ Not quantum-resistant |
| Use in SSH | ✔ Recommended for new keys | ✔ Still widely used and supported |
Created
July 29, 2025 10:34
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Ed25519 vs RSA
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