What is a Digital Signature?

This technology consists of the signature of any electronic document with unquestionable legal validity. Understand it better.

Digital Signature Concept

The Digital Signature is equivalent to a handwritten signature. It is a technology that uses encryption and links the digital certificate to the electronic document that is being signed. Thus, it gives guarantees of integrity and authenticity.

With a Digital Signature, your company or your department will eliminate the manual process of collecting signatures, the physical shipment of documents, the notarization of signatures and the management of physical documents, reducing costs, simplifying the processes and substantially speeding up the formalization of documents.

The validity and legal admissibility of the digital signature are guaranteed by article 10 of MP No. 2,200-2, which instituted the Infrastructure of Brazilian Public Keys - ICP-Brasil, conferring the presumption of legal veracity in relation to the signatories in the statements contained in the electronic documents.


Any change in the electronic document causes the signature to be invalidated, thus guaranteeing the principle of inalterability.

The author of the digital signature uses their private key to encrypt it in order to guarantee authorship in an electronic document. This authenticity is only achieved because the private key is accessible exclusively by its owner.

When a person digitally signs, they use their private key to encrypt the document. Thus, they are prevented from denying the authenticity of the message.

Guaranteed by article 10 of MP No. 2.200-2, which instituted the Infrastructure of Brazilian Public Keys – ICP-Brasil, conferring the assumption of legal veracity in relation to the signatories in the statements contained in the electronic documents produced by using the certification process made available by ICP-Brasil.


The digital signature can be applied to the most diverse types of electronic documents such as: contracts, powers of attorney, reports, e-mails, certificates, web forms, reports, images, mandates, notifications, balance sheets, statements, petitions, exam results, medical records, proposals and insurance policies and electronic files transferred between companies (EDI), making it possible to eliminate the use of paper and reduce the costs of issuing, storing and disposing of these documents.


It involves document shipment (courier, post office and others), paper printing (toner and ink), physical storage (warehouse, files, safes and others), document management (control, consultancy, validity, audit, location and recovery) and signature authentication (digital signature).

How long does it take you to formalize a paper contract? If it depends on the QualiSign Portal, it is very fast. It is enough for the parties to access the web, no matter where they are physically, holding their digital certificates to sign the contract.

Authenticity, integrity, non-repudiation, reliability, inability to backdate in time, minimizing fraud and state-of-the-art technology infrastructure.

Anywhere on the planet, with your digital certificate, a card reader and access to the web you sign a contract or any document, at any time.

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Company: : Qualisign Informática SA - Registered with CNPJ/MF No. 17.489.855/0001-20 - State Registry exempt

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This website uses ICP-Brasil, standards, as per Provisional Measure 2.200-2 of August 24, 2001.