FAQ Category: How it works

Three types of signature are available on Closd: Simple and Advanced electronic signatures, and Handwritten “wet-ink” signatures. Simple and Advanced electronic signatures are equally valid under the eIDAS EU regulation. They vary in the level of authentication required for signatories, hence in the probative force, or body of proof of the signatory’s identity, of the

No. Electronic signature technologies play the same role as notarial binding (thanks to the document’s digital “fingerprint”). Therefore, any modification of an electronically signed document subsequent to its signature is automatically detected by the PDF reader in which it is opened. If the document was modified, a message appears warning the user that the affixed

An electronic signature is composed of electronic data and leaves no graphic representation on the document. Electronic signatures’ validity and probative force lie in the digital data incorporated into the document, which guarantee its integrity and the signatory’s identity. This is done through the issuance of: (1) A digital certificate that proves that the signatory’s identity has

A PDF reader (such as Adobe Acrobat Reader) can verify the validity of an electronic signature. When the document is opened, the PDF reader automatically performs two operations: It calculates the document’s fingerprint to see if it matches the fingerprint of the document that was signed; It checks the digital certificate to ensure its validity

“Advanced” level electronic signatures require strong authentication of signatories, providing a high level of security when signing more sensitive documents. This consists of a three-layer authentication process: Personal account protected by a secure password chosen after receiving an invitation to Closd; Automated ID verification: Before their first signature on Closd, signatories must upload a picture or scan

An authentication certificate is issued and archived by Closd upon each ID verification and electronic signature. This document gathers technical information relating to the ID verification (for Advanced signature) and to the electronic signature (envelope number, signatory’s email address, IP address, time and date, technology used, etc.). This authentication certificate is provided to users along