A common assumption in the privacy literature is that there are three types of possibly overlapping sets of personal attributes:
• Identifying attributes—attributes, such as social security number (SSN), which identify an individual uniquely.
• Quasi-identifying attributes—a combination of attributes which can identify an individual uniquely, such as name and address.
• Sensitive attributes—attributes that individuals may like to keep hidden from the public, such as political affiliation and sexual orientation.
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