Who First Named Physics Observers Alice and Bob?

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SUMMARY

The naming convention of the first two observers in hypothetical physical systems as Alice and Bob originated in the 1970s, primarily popularized by the work of cryptographers and physicists. This practice serves as a pedagogical tool in quantum mechanics and information theory, facilitating discussions around complex concepts. Additionally, the name Charles, or Chucky, has emerged in some scenarios, further expanding the nomenclature used in these discussions.

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ohwilleke
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It is now a common trope in physics education to name the first two observers of a hypothetical physical system Alice and Bob (i.e. person A and person B).

When did this practice originate and who was responsible for it?
 
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There also is Charles (Chucky) as well in some scenarios.
 
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