Measuring Accumulated Revelations of Private Information by Multiple Media

A metric has been developed for measuring privacy degradation when various types of media reveal private information about a person. The metric, which is based on joint entropy, quantifies accumulated revelations of information about various personal attributes. Application of this metric to entries posted on a social networking service and to leaks from a company database containing personal information showed that it is effective; that is, it can quantify accumulated revelations of information about multiple attributes and can cope with cases in which the attributes affect each other.

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