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Which is a fundamental disadvantage of biometrics?
Encryption
Placement
Revoking credentials
Communications
Biometric credentials are stored in electronic format on the server, they are easy to revoke, and/or remove completely from the system. Of the list provided, the only disadvantage is placement, and then only with regards retina/iris scans and the sun.
http://biometrics.pbworks.com/w/page/14811349/Advantages%20and%20disadvantages%20of%20technologies
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