- An intrinsic property is a bodily variable that never changes on a human being. Examples include a wide range of body features. Common examples include fingerprints, retinal features in the eye, handwriting, facial structure and blood vessel structure under the skin.
- The benefit of biometric systems is that the security computer system keeps on record who a person is by these features. If a security building requires codes and security cards, the chance a stranger can get into a building with any of that information is much higher compared to a biometric security system. Heightened security buildings can make sure that the same person comes into the building at all times.
- People who wish to enter into a building must first be scanned by the security firm. Each firm can choose which intrinsic attribute should be taken. Once that person has that attribute scanned by an X-ray or laser imaging software, then the person is permanently recorded within the security system. Scanners across a building will scan for that intrinsic attribute and allow the person access to a room or section of the building.
- Biometric systems are not without some criticism. Like any security system, issues of privacy are a common criticism. Once a person's bodily variable is inputted into the system, it is filed within a larger security network that may compromise a person's personal privacy. Also, the sheer fact that bodily parts are being measured to allow access to spaces is a major complaint in privacy dialogues. A study by Tech Cast, a think tank, also found many firms find the technology quite expensive to implement across their security grid.
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