The graphometric signature is an electronic signature, identical to a handwritten signature made on paper. A graphometric signature is made with a manual gesture using a digital tablet with a sensitive surface, which dynamically recognises hand movement, imitating pen on paper.

The features acquired by this device are:

  • writing speed
  • acceleration of hand movements
  • pressure used while signing
  • inclination angle
  • amount of times pen is lifted from the surface
  • movement of the pen

All these features are used to ensure the authenticity of a signature, comparing the uniqueness of each signature to previous signatures.

In general, excluding the method of signature acquisition, there are two basic application principals:

  • Authentication method used with handwritten signatures (not the case of a graphometric signature)
  • Advanced Graphometric Electronic Signature is a method with which biometric data of a signature is uniquely associated with the document being signed (usually PDF) and encrypted to make it inaccessible. Then it is inserted in an electronic signature field which conceals its integrity. In particular, while the signature is being made, the biometric data is encrypted; encryption takes place directly on the signature HW, using a public pre-installed key on the HW. At the same time, this data is stored and encrypted within the document. Only who is in possession of the private key will be able to extract the biometric data from the document.

Who receives the signature should therefore not be in possession of both keys in order to guarantee maximum protection of the biometric data: the decryption key can therefore be deposited with a third-party Trustee, a service provided by eWitness.

Given the conferred legal value, the advanced graphometric electronic signature finds application in various sectors, such as banking, insurance, finance, consumer credits, utilities, online acquisitions , and medical documents such as consent and privacy .