Claim
A claim represents a fact about something or somebody.Better. A
claim is a statement that a certain fact applies to something or
somebody. As such, it is subject to veri?¬?cation. In other words,
you can accept or reject the claim based on your beliefs, knowledge
of the situation, and so on. Classical examples of claims
about people are ???Bob was born in 1956,??? ???Bob is a Belgian
citizen,??? ???Bob belongs to the ???Managers??™ user group at
Contoso.com,??? ???Bob has green eyes,??? ???Bob can buy $5000
worth of merchandise,??? ???Bob is really the one who received this
ticket from the TGS.??? Claims about things are no different:
???Contoso??™s public key is Fx0Ex0??¦,??? ???Contoso has its main of-
?¬?ce in Las Vegas,??? and so on.
Those claims may or may not actually apply to Bob or Contoso.
The way in which you get to decide one way or the other accounts
for a good part of the entire identity management
process.
(Digital) Identity
As central as this concept may be to the topic of this book, the
de?¬?nition of (digital) identity is largely unimpressive:
A (digital) identity is a set of claims made by a subject about itself
or another subject.
In the section ???Roles in the Identity Metasystem??? we will see
what we mean exactly by subject,abbreviated S .
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