A digital signature is like a written signature, but it's done with technology.

It is used to ensure that an electronic document, such as a contract or statement, has not been modified since it was signed.

It also confirms that the correct person sent it.

It is very useful in online procedures, companies, banks and governments because it helps prevent fraud and ensures that everything is legal and authentic, without the need for paper.

The digital signature is a cryptographic technique based on public key systems (PKI) that guarantees three fundamental pillars: genuineness, integrity and No repudiation of the information transmitted.

The signer generates a hash of the content to be signed and encrypts it with their private key.

The recipient, using the corresponding public key, can verify that the content has not been modified and that the signer is who he says he is.

This mechanism is integrated into cybersecurity standards, blockchain, smart contracts and digital identity systems, complying with regulations such as eIDAS in Europe.