Alice and Bob

The names Alice and Bob are two commonly used placeholder names. They are used for archetypal characters in fields such as cryptography and physics. The names are used for convenience; for example, "Alice sends a message to Bob encrypted with his public key" is easier to follow than "Party A sends a message to Party B encrypted by Party B's public key." Following the alphabet, the specific names have evolved into common parlance within these fields—helping technical topics to be explained in a more understandable fashion.

In cryptography and computer security, there are a number of widely used names for the participants in discussions and presentations about various protocols. The names are conventional, somewhat self-suggestive, sometimes humorous, and effectively act as metasyntactic variables.

In typical implementations of these protocols, it is understood that the actions attributed to characters such as Alice or Bob need not always be carried out by human parties directly, but also by a trusted automated agent (such as a computer program) on their behalf.

Read more about Alice And Bob:  List of Characters

Famous quotes containing the words alice and/or bob:

    “Then you should say what you mean,” the March Hare went on.
    “I do,” Alice hastily replied; “at least—at least I mean what I say—that’s the same thing, you know.” “Not the same thing a bit!” said the Hatter. “Why you might just as well say that ‘I see what I eat’ is the same thing as ‘I eat what I see’!”
    Lewis Carroll [Charles Lutwidge Dodgson] (1832–1898)

    English Bob: What I heard was that you fell off your horse, drunk, of course, and that you broke your bloody neck.
    Little Bill Daggett: I heard that one myself, Bob. Hell, I even thought I was dead. ‘Til I found out it was just that I was in Nebraska.
    David Webb Peoples, screenwriter. English Bob (Richard Harris)