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Iris recognition Iris recognition relies upon the fact that every individuals retina has a unique structure. The iris landscape is composed of a corona, crypts, filaments, freckles, pits radial furrows and striatations. Iris scanning is considered a particularly accurate identification technology because the characteristics of the iris do not change during a persons lifetime, and because there are several hundred variables in an iris which can be measured. In addition, iris scanning is fast: it does not take longer than one or two seconds. These are characteristics which have made iris scanning an attractive technology for high-security applications such as prison surveillance. Iris technology is also used for online identification where it can substitute identification by password. As in other biometric technologies, the use of iris scanning for the protection of privacy is a two-edged sword. The prevention of identity theft applies horizontally but not vertically, i.e. in so far as the data retrieval that accompanies identification and the data body which is created in the process has nothing to do with identity theft. |
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IIPA The International |
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Caching Caching generally refers to the process of making an extra copy of a file or a set of files for more convenient retrieval. On the Internet caching of third party files can occur either locally on the user's client computer (in the RAM or on the hard drive) or at the server level ("proxy caching"). A requested file that has been cached will then be delivered from the cache rather than a fresh copy being retrieved over the Internet. |
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