The term anonymity originates from the Greek word “anonymia,” which means “without a name.”
In the context of computing, anonymity has been defined in  as follows: “Anonymity of a subject means that the subject is not identifiable within a set of subjects, the anonymity set.” The anonymity set is the set of all possible subjects, e.g., the set of all possible senders of a message or the set of all possible recipients of a message (dependent on the knowledge of an attacker). Sender anonymity means that a message cannot be linked to the sender, while receiver anonymityimplies that a certain message cannot be linked to the receiver of that message. Relationship anonymity of a sender and recipient means that even though a sender and a recipient can be identified as participating in some communication, they cannot be identified as communicating with each other, i.e., sender and recipient are unlinkable. The definition above...
- 1.Common Criteria Project, common criteria for information technology security evaluation, part 2: security functional requirements, Jan 2010, ISO/IEC 15408-1:2009. www.commoncriteriaportal.org.
- 2.Pfitzmann A. Hansen M. A terminology for talking about privacy by data minimization: anonymity, unlinkability, unobservability, pseudonymity, and identity management version 0.34. http://dud.inf.tu-dresden.de/Anon_Terminology.shtml. 10 Aug 2010.