The Elliptic Curve Digital Signature Algorithm (ECDSA) is a cryptographic technique used to ensure the authenticity and integrity of digital messages. It relies on the mathematics of elliptic curves, which allows for smaller key sizes compared to traditional methods like RSA, while maintaining a high level of security. This efficiency makes ECDSA particularly suitable for environments with limited processing power and storage. In ECDSA, a user generates a pair of keys: a private key, which is kept secret, and a public key, which is shared. When a message is signed using the private key, anyone with the public key can verify the signature, confirming that the message has not been altered and is indeed from the claimed sender.