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Kim Cameron’s Identity Weblog » Keys, signatures and linkability: "Consider a user who self-generates several identity claims at different occassions, say “I am 25 years of age”, “I am male”, and “I am a citizen of Canada”. The user’s software packages these assertions into identity claims by means of attribute type/value pairs; for instance, claim 1 is encoded as “age = 25”, claim 2 is “gender = 0”, and claim 3 is “citizenship = 1”. Clearly, relying parties that receive these identity claims cannot trace them to their user’s identity (whether that be represented in the form of a birth name, an SSN, or another identifier) by analyzing the presented claims; self-generated claims are untraceable. Similarly, they cannot decide whether or not different claims are presented by the same or by different users; self-generated claims are unlinkable."

Source: identityblog