1. a digital identity is defined as a set of claims made by one digital subject about itself or another digital subject. http://www.identityblog.com/stories/2005/05/13/TheLawsOfIdentity.pdf Who are you? Just as in the physical world, all of us have a variety of digital identities , and they're expressed in different ways. http://msdn2.microsoft.com/en-us/library/aa480189.aspx#introinfocard_topic1 (The New Yorker, Vol. 69 (LXIX) no. 20, page 61, July 5, 1993, by Peter Steiner) http://www.swiss.ai.mit.edu/6095/student-papers/fall98-papers/identity/white-paper.html A critical problem in cyberspace is knowing with whom you are interacting. In essence, the problem is that "on the Internet, nobody knows you're a dog." Currently, you cannot determine accurately the identity of the person on the other side of an e-mail message or know with certainty the source of any information in cyberspace.