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AEMELIA: Most mighty duke, behold a man much wrong'd.
All gather to see them.
ADRIANA: I see two husbands, or mine eyes deceive me!
DUKE SOLINUS: One of these men is Genius to the other;
And so of these, which is the natural man,
And which the spirit? Who deciphers them?
DROMIO OF SYRACUSE: I, sir, am Dromio: command him away.
DROMIO OF EPHESUS: I, sir, am Dromio: pray, let me stay.—The Comedy of Errors, V, i, 332–338
The theme of identity runs throughout humanity's experience, and computers are no exception. In computer science, an identity is the basis for assignment of privileges and is integral in the designation of a protection domain. This chapter discusses the many different types of identity and the contexts in which they arise. It begins with the identity of a principal on a system, first singly and then as defined by function. Designation of identity for certificates follows, as does identity on a network with respect to both individual processes and individual hosts. The chapter concludes with the notion of an anonymous user.
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