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Overview / Biometric signature

The customer signs on a tablet. The paper disappears.

Documents issued by the application are signed biometrically on a Wacom device, sealed electronically and archived. The operator saves time at the counter, and you have the documents at hand, from anywhere.

Why it is worth it

  • Documents cannot be forged

    An electronically signed document cannot be altered without access to the signing keys, and these never leave the Datagram cloud.

  • The signature can be examined by experts

    If needed, handwriting experts can compare very precisely the characteristics stored in the biometric signature with the person’s physical signature.

  • The archive is available from anywhere

    Archived documents can be consulted or reprinted at any time, from the branch or from the head office.

The technologies we chose

The solution is designed and developed entirely by Datagram.

  • Wacom devices

    The signature is captured on Wacom devices, chosen for their performance and reliability.

  • Documents in HTML format

    Signed documents open directly in the application or in any browser, with no processing, and take up very little space.

  • SHA-256 cryptographic fingerprint

    The same algorithm widely used in the crypto industry, including in the Bitcoin blockchain.

  • Our own scalable archive

    Documents are kept in a storage solution developed by Datagram, which adapts dynamically to each client’s volume.

How a document is signed

  1. The application builds the document. It can include the operator’s signature and the location’s stamp.
  2. A first SHA-256 fingerprint of the document is calculated and appended to it, without altering it.
  3. The customer signs on the tablet. The biometric data also contains the first fingerprint, so the signature is tied strictly to that document.
  4. The signature image and the biometric data are added to the document.
  5. A second SHA-256 fingerprint is calculated for the whole content and encrypted with the private key. The result is the digital signature.
  6. The digital signature and the public key are added to the document. From this moment, the document can no longer be changed.

How authenticity is verified

  1. The fingerprint of the document itself is recalculated and compared with the one stored in the document.
  2. The biometric data is checked for tampering, and the fingerprint inside it is compared with that of the document.
  3. The digital signature is decrypted with the public key and compared with the fingerprint of the whole content.

If all checks pass, the document is the original, unaltered. Datagram provides clients with an application that performs these checks automatically.

Where the keys are kept

The private key is specific to each client and is kept exclusively in the Datagram cloud. It cannot be accessed from outside: not by applications, not by operators, not by third parties. The public key is included in every signed document.

Have a question? We answer straight away.

Sales: 021 312 0980   Technical support: 031 405 1111

office@datagram.ro Back to the overview