There are a variety of biometric characteristics that can be collected from humans including iris recognition, hand geometry, fingerprint recognition, facial recognition, and voice recognition. Biometrics technology is continuously developing to improve accuracy, robustness and security which has seen the emergence of second generation biometrics that utilise multi forms of biometrics together, behavioural biometrics and soft biometrics (e.g. gender, age, ethnicity). Any biological or behavioural characteristics could be used to identify individuals if it meets the following requirements:
1. Collectability (the elements can be measured)
2. Universality (the element exists in all person)
3. Unicity (the element must be distinctive to each person)
4. Permanence (the property of the element remains constant over time).
Biometric systems operate in two basic modes: verification and identification . Verification mode is used to validate a person against whom they claim to be and use one to one matches by comparing biometric data taken from an individual to a biometric template stored in a database. Verification relies on individuals enrolling on the system and registering their identity prior to providing biometric samples which is a massive administrative task when applied to international border control. Identification mode uses a one to many match and searches all the templates in a database to identify an individual therefore the system does not need the compliance of the data subject. The accuracy of biometric technology depends on the accuracy and number of records within the databases.
Biometric systems are not perfect and systems compare data collected from the data subject to algorithms to determine identification and, where matches are sufficiently close, they will indicate a match. Biometrics systems rely on matching data to algorithms but they 'make two types of errors: 1) mistaking the biometric measurement from two different persons to be from the same person (called false match) and 2) mistaking two biometric measurements from two different persons to be from the same person (CALLED). Biometrics systems view the natural patterns of the body as a 'source of order' and 'a source of unprecedented accuracy and precision. The body is a form of information and this can supersede and make redundant the 'talking individual, who owns the body, and they have been criticized for treating individuals as objects.
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