Biometric authentication poses several challenges including privacy, security, and technical issues. Using biometrics for remote authentication is not recommended due to the risk of large-scale compromises if authentication servers are attacked. Biometrics are also not unique and cannot be changed if compromised, as opposed to a password. Current biometric scanners also cannot reliably distinguish between real and artificial fingerprints. While biometrics may be convenient, the technology is still fallible and not suitable as a primary authentication method.

1. Problems with Biometric
Authentication
Problems with Biometric Authentication
NSF (National Science Foundation,USA) Report: Who Goes There?
Authentication through the Lens of Privacy
“Recommendation: Biometric Technologies should not be used to authenticate users via
remote authentication servers because of the potential for large-scale privacy and
security compromises in the event of a successful attack (either internal or external)
against such servers. The use of biometrics for local authentication – for example, to
control access to a private key on a smart card – is a more appropriate type of use for a
biometric.”
Pitfalls with Biometric Authentication mechanisms:
 False Acceptance/False Rejection tradeoff
– Acceptable false rejection rate usually means non-negligible false acceptance
rate
– Very expensive testing required to fully characterize
 Biometrics readers often can be fooled by “artifacts”
– “Liveness detection” largely a research topic
• Very expensive testing needed to verify
– For high assurance the reader should be attended or at least observed until we
get verifiably strong liveness detection
Challenges to be addressed with Biometrics:
In theory, biometrics are a great way to authenticate a user: it's impossible to lose your
fingerprint, you can't forget it like you could a password, and it's unique to you. In practice,
though, there are so many things that, for now, limit a more widespread use of this technology.
One of the problems is its uniqueness the thing that makes using biometric data an inherently
flawed choice for a primary method of authentication. Once you have your fingerprint scanned
it will give a unique data sequence which if compromised is not exactly something you can
change. Imagine having an option of only one password 'ever'. One loss and your identity is
compromised for-ever.
Another problem is that current scanners still can't recognize if the fingerprint is on a real finger
or an artificial one. In theory, one could get a hold of the user's fingerprint using techniques
used in crime detection and transfer it on an artificial finger. This will likely change as the
technology evolves, but for now the system is still fallible, and not suitable to be a primary
solution to the authentication problem.
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