Voice biometrics

What is voice biometrics

Voice biometrics is a technology of automatic identification and authentication of a person by his unique voice characteristics: timbre, frequency, intonation, manner of speech, rate of pronunciation and other acoustic parameters. Unlike passwords or PIN codes, the voice is a unique biological feature that cannot be forgotten or lost. Voice biometrics is actively used in banking, state services (including the Unified Biometric System (UBS)) and in corporate call centers for remote client identification. In Russia, the technology is regulated by 152-FZ (on personal data) and passes certification by FSTEC for use in government systems.

How voice biometrics works

The voice biometrics process includes several sequential stages that ensure high accuracy and reliability of identification. The first stage is the recording of a voice sample. The user pronounces a control phrase (text-dependent method, where the phrase is known to the system) or conducts free speech (text-independent method, where the system analyzes any speech without reference to a specific phrase). The second stage is the creation of a voiceprint (template). The system identifies unique voice characteristics: frequency parameters (spectrogram), rhythm, timbre, formant frequencies, speech rate, pauses, intonation changes and other acoustic features. On the basis of these data, a mathematical model is created — a voice template that usually occupies from 2 to 10 KB. The third stage is the storage of the template. The model is stored in a protected database integrated with cryptographic protection tools (CIPF), which ensures the impossibility of restoring the original voice from the template. The fourth stage is comparison and verification. During a subsequent authentication attempt, the system records the current voice, creates a new template and compares it with the saved one, calculating the degree of similarity (usually in percentages). The verification process takes from 3 to 15 seconds. Voice biometrics integrates with the Fast Payment System (FPS) to confirm transactions and with the electronic signature for remote document signing.

Key advantages of voice biometrics

The implementation of voice biometrics gives organizations and users a number of significant advantages. Convenience for the user — no need to remember passwords, carry tokens or smart cards, it is enough to just talk. High security — the voiceprint is difficult to fake or steal, since it is based on the unique physiological features of the speech apparatus. Versatility — the technology works through any communication channels: phone calls, mobile applications, web interfaces, messengers. Verification speed — identification takes from 3 to 15 seconds, which is significantly faster than entering passwords or waiting for SMS codes. Reduction of operating costs — automation of identification in call centers makes it possible to reduce client service time by 30-40%. Protection from fraud — voice biometrics effectively resists attacks using voice recordings thanks to liveness detection systems.

Methods of voice biometrics

There are two main methods of voice biometrics: text-dependent and text-independent. The text-dependent method requires the user to utter a previously known phrase (passphrase). The system compares the utterance with the reference, analyzing both the voice and the pronunciation. This method provides higher accuracy, but is less convenient for the user. The text-independent method does not restrict the user in speech — the system analyzes any speech, extracting voice characteristics regardless of the words spoken. This method is more convenient for the user, but requires a larger volume of speech material for reliable identification (usually 30-60 seconds of speech).

Use of voice biometrics in Russia

In Russia, voice biometrics is actively implemented in various economic sectors. In the banking sector, it is used to confirm operations in contact centers, log in to mobile applications (replacing a PIN code), confirm transfers by phone and identify clients when opening accounts remotely. In the government sector — in the Unified Biometric System (UBS) for receiving state services without a passport, in electronic voting systems, when processing documents through the MFC. In the corporate sector — for protecting access to confidential information, voice access control to premises, time and attendance accounting. In telecommunications — for identifying subscribers when contacting support.

Security and protection from attacks

Modern voice biometrics systems use a set of measures for protection from attacks. Liveness detection protects against attacks using voice recordings. The system can request the utterance of a random phrase, analyze micro-pauses, natural articulation noises (breathing, swallowing), as well as check acoustic characteristics that cannot be reproduced with a recording. Anti-spoofing mechanisms protect against synthesized voices and deepfakes. Template encryption ensures data protection during storage and transfer. Multi-factor authentication combines voice biometrics with other factors (password, SMS code, device) to increase reliability.

Implementation of voice biometrics

The implementation of voice biometrics requires a professional risk assessment and integration with existing systems. It is necessary to analyze business processes, determine usage scenarios, choose an appropriate method, assess the required level of accuracy and protection. It is important to ensure compliance with the requirements of 152-FZ on the collection and processing of biometric personal data. The design service will help determine the optimal architecture, choose a vendor, configure liveness detection systems and integration with existing systems. Training courses will allow specialists to correctly configure and operate the system.