ECDSA (Elliptic Curve Digital Signature Algorithm) is a variant of the Digital Signature Algorithm (DSA) that uses elliptic curve cryptography. It provides the same level of security as RSA with much smaller key sizes.

Use Cases: Digital signatures, authentication, non-repudiation, and blockchain transactions.

Curves:

• P-256: 256-bit curve, equivalent to 3072-bit RSA security
• P-384: 384-bit curve, equivalent to 7680-bit RSA security
• P-521: 521-bit curve, equivalent to 15360-bit RSA security

Security Note: Always keep your private key secure and never share it. The public key can be shared freely and is used to verify signatures created with the corresponding private key.