What is a cryptographic signature?

A cryptographic signature is a method of data protection that allows verifying the authenticity and integrity of messages or documents. It uses asymmetric encryption: one key is used for signing, and another one is used for verifying the signature. By signing the information, the sender guarantees that the message has not been altered, and the recipient can be confident in its authenticity. Cryptographic signatures are widely used in blockchain, protecting transactions and ensuring the security of digital assets.