A green light appears, and the machine says, “Authentication successful.” For the person standing in front of the scanner, the whole process may take only a few seconds. There is no password to remember, no card to insert and no form to fill out. A finger is placed on a sensor, a face is presented to a camera, or an eye is scanned, and the machine makes its decision. We have become so accustomed to this process that it can feel almost ordinary. Yet behind that moment of convenience lies a question that deserves far more attention: what happens when the thing being used to prove who we are is also something we cannot replace as easily as a password?

If someone steals your password, you can change it. If your PIN is exposed, you can create another one. If your bank card is lost, you can cancel it and receive a new one. But biometric characteristics are different. A fingerprint, iris or facial characteristic is closely tied to the individual and is difficult or impossible to replace in the ordinary way that a password or token can be replaced. ISO/IEC 24745, the international standard on biometric information protection, identifies this as one of the central privacy and security challenges of biometric authentication.

This does not mean that a compromised biometric automatically gives a criminal access to everything a person owns. Modern biometric systems use security measures such as encryption, protected devices, liveness detection and other controls. The concern is more fundamental. If a credential is closely connected to our body, the consequences of protecting it badly can be more difficult to reverse. A password belongs to us, but a fingerprint belongs to our body. Once our bodies become part of the machinery of digital identification, protecting biometric information becomes more than a question of cybersecurity. It becomes a question about protecting identity itself.

This is no longer a distant concern. In India, biometric identification has already become part of everyday life on a remarkable scale. In March 2026, the Government of India reported that Aadhaar had approximately 134 crore live holders and had completed more than 17,000 crore authentication transactions. Aadhaar authentication can use OTP, fingerprint, iris, face or demographic information, depending on the authentication method. The numbers are enormous, but the significance of biometric identification is easier to understand through an ordinary person's experience. A worker may use it to establish identity, a customer may encounter biometric verification while accessing a financial service, and a citizen may depend on an authentication system while trying to obtain a service. For millions of people, the question is no longer whether biometric technology will become part of their lives. It already has.

There are good reasons for this transformation. Passwords can be forgotten, shared or poorly protected. Biometric characteristics offer another way of establishing identity and can make authentication more convenient. India has therefore invested heavily in systems capable of verifying identity at a very large scale. It would be misleading to describe biometric technology as inherently dangerous or to suggest that every biometric system is waiting to be hacked. Modern systems are designed with multiple safeguards. In the Aadhaar ecosystem, for example, the government says authentication is subject to informed consent, certified devices, secure and limited authentication responses, encrypted data retention, audit trails and a policy of no biometric data retention by authentication entities.

UIDAI also gives Aadhaar holders a way to lock their biometric authentication. When biometric locking is enabled, fingerprint, iris and face authentication cannot be used until the holder unlocks the biometrics. UIDAI describes the facility as a measure intended to strengthen the privacy and confidentiality of Aadhaar biometric information. Such measures are important because security is not simply about building a system and assuming that it will remain safe forever. It is about continuously reducing how that system can be misused.

This becomes even more important as artificial intelligence changes the nature of digital fraud. A photograph, video or voice recording can now be manipulated or generated with increasingly sophisticated tools. The danger is not that every biometric system can be defeated by an ordinary deepfake. Modern systems are specifically being developed to detect such attacks. The more important point is that identity systems must now take manipulated and synthetic media seriously.

The National Institute of Standards and Technology's 2025 Digital Identity Guidelines explicitly added controls dealing with injection attacks and forged media, including deepfakes. Its identity-proofing guidance recommends measures for detecting forged or manipulated images and videos and even discusses analysing digital media for signatures associated with generative-AI and deepfake tools. This shows how quickly the security conversation is changing. A system that once mainly needed to distinguish one person's face from another may increasingly have to determine whether the face presented to it is genuine, whether the capture process has been manipulated and whether the identity evidence itself has been artificially produced.

India's own biometric infrastructure is evolving in response to similar concerns. UIDAI says its registered biometric devices use secure hardware and advanced liveness detection for anti-spoofing. It also reports that Fake Finger Detection has been implemented in newer fingerprint devices and that an AI/ML-based model is used to check fingerprint liveness. The contest is therefore moving in two directions at once. Security systems are becoming better at identifying genuine biometric signals, while attackers are looking for better ways to imitate or manipulate them. Biometric security is not a finished achievement; it is an ongoing contest.

Yet the biometric question goes deeper than whether a criminal can fool a scanner. We should also ask what happens to biometric information after it has been collected. Who stores it? For what purpose? How long is it retained? Who can access it? What happens if an organisation holding sensitive personal information fails to protect it? These questions matter because biometric information is different from an ordinary piece of contact information. A password can be replaced. A biometric characteristic is far more difficult to replace.

India has also been developing a broader framework for protecting personal data. The Digital Personal Data Protection Rules, 2025, were notified by the Ministry of Electronics and Information Technology in November 2025. The rules provide implementation details for the Digital Personal Data Protection Act, including requirements relating to notices, consent management and security safeguards. MeitY's explanatory note says that notices to individuals should clearly state what personal data is being collected and the purpose for processing it, while consent should be capable of being managed and withdrawn.

A legal framework is important, but legislation alone cannot eliminate every technological vulnerability or human error. Privacy also depends on how institutions behave in practice. A person standing before a biometric scanner usually sees only a simple instruction: place your finger, look at the camera or complete the verification. The complicated questions about storage, security, access and accountability happen somewhere behind that moment.

There is another problem that deserves equal attention: sometimes the system may fail even when nobody is trying to attack it. A fingerprint may not be recognised. A person's biometric characteristics may not be captured clearly. A network may not be available. UIDAI itself recognises technological and biometric limitations, including poor fingerprint quality and network problems, and states that service providers should have alternative processes and exception mechanisms so that people are not denied entitlements because of such limitations.

That point is particularly important. For someone unlocking a phone, a failed biometric check may be little more than an annoyance. For someone depending on authentication to access an essential service, however, the consequences can be much greater. A biometric system should therefore protect people not only from criminals but also from the possibility that its own technology may be wrong. Security should not mean creating a system in which a machine's “no” becomes more powerful than a person's ability to prove who they are by other means.

This leads to a larger question about the kind of digital society we are building. There is an understandable desire to make identification increasingly effortless. The ideal seems attractive: no passwords, no cards, no complicated codes. Just be yourself, and the system will recognise you. But the phrase “just be yourself” becomes more complicated when your face, fingerprint or iris is transformed into a digital credential. If identity becomes easier to verify, does it also become more important to protect? If we place more of our permanent physical characteristics into digital systems, are we making life safer—or making the consequences of failure more difficult to reverse?

The answer should not be a rejection of biometric technology. That would ignore the genuine benefits it can provide. The better answer is to demand better standards as biometric use expands. Organisations should collect only the information they genuinely need and protect it with strong technical safeguards. Biometric authentication should, where appropriate, work alongside other forms of verification rather than being treated as an infallible proof of identity. People should have meaningful alternatives when biometric authentication fails. Institutions handling highly sensitive information should be accountable when they misuse it or fail to protect it. And as artificial intelligence becomes increasingly capable of producing convincing synthetic media, identity systems must continue improving their ability to distinguish genuine evidence from manipulated evidence.

Perhaps the most important change, however, has to take place in our own thinking. We have become accustomed to treating digital security as a matter of protecting passwords and accounts. Biometric technology asks us to think differently. Our bodies are increasingly becoming part of the authentication process, and that means the boundary between the physical self and the digital self is becoming thinner. A fingerprint on a scanner may look like a small technical event, but it represents something much larger: a human being allowing a technological system to decide identity.

That is why the question “Is your biometric at risk?” should not be dismissed as another warning about hackers. It is a question about permanence. It is a question about trust. It is a question about whether technological convenience is moving faster than our ability to protect the people who depend on it. Biometrics can make our digital lives easier and, when properly designed, can contribute to secure authentication. But the more deeply we rely on them, the more carefully we must protect them.

A password can be changed. A PIN can be reset. A bank card can be cancelled. A biometric characteristic is not so easily replaced. And if the digital world increasingly asks our bodies to prove who we are, perhaps the responsibility of that world is equally clear: before making our identity easier to recognise, it must make our identity harder to compromise.

References:

1. International Organisation for Standardisation. (2022). ISO/IEC 24745:2022: Information security, cybersecurity and privacy protection—Biometric information protection. https://www.iso.org
2. Ministry of Electronics and Information Technology. (2025). Digital Personal Data Protection Rules, 2025. Government of India.
3. Ministry of Electronics and Information Technology. (2025). Explanatory note to Digital Personal Data Protection Rules, 2025. Government of India.
4. National Institute of Standards and Technology. (2025). Digital identity guidelines (NIST Special Publication 800-63-4). U.S. Department of Commerce. https://doi.org
5. National Institute of Standards and Technology. (2025). Digital identity guidelines: Identity proofing and enrollment (NIST Special Publication 800-63A-4). U.S. Department of Commerce. https://doi.org
6. Press Information Bureau. (2026, March 18). Aadhaar is the world's largest biometric identity system with approximately 134 crore live Aadhaar holders. Ministry of Electronics and Information Technology, Government of India.
7. Unique Identification Authority of India. (n.d.). Biometric lock/unlock. Government of India.
8. Unique Identification Authority of India. (n.d.). For Aadhaar number holders: Authentication. Government of India.
9. Unique Identification Authority of India. (2026). Biometric devices. Government of India.
10. Yang, W., Wang, S., Cui, H., Tang, Z., & Li, Y. (2023). A review of homomorphic encryption for privacy-preserving biometrics. Sensors, 23(7), 3566. https://doi.org

.    .    .