Identity knowledge has multiple components and there are degrees of identifiability.
7 types of identity knowledge are:
- Legal name
- Locatability
- Pseudonyms that can be linked to legal name and/or locatability --literally a form of pseudo-anonymity
- Pseudonyms refers the equivalent of "real" anonymity (except that the name chosen may hint at some aspects of "real" identity, as with undercover agents encouraged to take names close to their own)
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- Pattern knowledge refers to the identity that may be made by reference to distinctive appearance or behavior patterns of persons.
- Social categorization. Simply being at certain places at particular times or associating with particular kinds of people (note the folk wisdom that "birds of a feather flock together" or "you are known by the company you keep") can also be a key to presumed identity.
- Symbols of eligibility/non-eligibility. identification may involve certification in which the possession of knowledge (secret passwords, codes) or artifacts (tickets, badges, tattoos, uniforms) or skills (performances such as the ability to swim) labels one as a particular kind of person to be treated in a given away.
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