Key Algorithm
The public key algorithm used in this certificate
The Key Algorithm identifies the type and parameters of the public key contained within the SSL certificate. This field specifies both the cryptographic algorithm family (such as RSA or ECDSA) and key strength parameters like key length or curve type. Common key algorithms include RSA with various key lengths (2048-bit, 3072-bit, 4096-bit), and Elliptic Curve algorithms like ECDSA P-256, ECDSA P-384, and Ed25519.
RSA keys are widely supported but require larger key sizes for equivalent security - a 2048-bit RSA key provides similar security to a 256-bit elliptic curve key. ECDSA keys offer advantages in terms of performance, smaller certificate sizes, and lower computational overhead, making them increasingly popular for modern applications. The key algorithm choice affects certificate size, handshake performance, and computational requirements for both servers and clients.
This information is crucial for compatibility assessment and security evaluation.
Where You'll See This Term
This term commonly appears in:
- SSL certificate details pages
- Certificate Authority validation processes
- SSL configuration documentation
- Security audit reports
- Certificate management interfaces