A form of identification that is considered strong is to ask for unique ID element from the registering users, e.g., the SSN of the participant, asking for place of birth, etc. Souma Miura: Interestingly enough, I was able to fool quite a few websites that supposedly guarantee for the identity of their participants.
Interestingly enough, it is trivially easy to bypass many such identity tests. You can specify the characteristics of the name that you want, and you get back an entry that you want. All of them accepted without problems the fake identities, and in some cases even the credit card numbers (not for actual charges but the fake credit card numbers were accepted as legitimate credit cards to create a profile).
At the very basic level, if participants can easily create new identities, then reputation systems lose part of their power: If a user gets scores that are mediocre or bad, then it is often preferable to abandon the account with the bad scores and start again.
Even more importantly, Sybil attacks, where one participant generates multiple accounts, can fool many systems that rely on peer evaluation, or assume that users are independent of each other.
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It is conceivable that someone will be able to guarantee for the identify of a person, but you can see already the Big Brother concerns that such a service will raise.
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