Biometric Signature

What is Biometric Signature?

A biometric signature is an electronic signature that incorporates biometric data captured during the act of signing. When a person signs on a touchscreen or signature pad, the system can capture not just the visual appearance of the signature but also behavioral biometric data such as writing speed, pen pressure, stroke order, acceleration patterns, and timing. This data creates a unique biometric profile that is extremely difficult to forge.

Biometric signatures are distinct from other forms of biometric authentication (like fingerprint or facial recognition used for identity verification). While those methods verify identity before signing, biometric signatures capture identifying data during the signing act itself. The biometric data becomes part of the signature evidence and can be used forensically to verify or dispute a signature's authenticity.

The evidentiary value of biometric signatures is significant. While a visual signature image can potentially be copied, the underlying biometric data — the dynamic characteristics of how someone writes — is virtually impossible to replicate precisely. Forensic handwriting experts can analyze this data to determine with high confidence whether a signature was made by a specific individual.

Privacy considerations are important with biometric signatures. Biometric data is classified as special category data under GDPR, requiring explicit consent and additional protective measures. E-signature platforms that capture biometric data must clearly inform signers about what data is being collected, how it will be used, and how long it will be retained.