Definition of "Bob"

Bob

/bɒb/

proper noun
1. A diminutive of the male given name Robert.
2. (cryptography, physics) The person or system receiving a message or signal from a source conventionally known as Alice.
  Quotations
  The key that Alice and Bob are to share cannot be transmitted in the clear. Either it must be enciphered when sent, or Alice and Bob must derive it without an exhange of data from which the key can be derived.
  2003, Matt Bishop, Computer Security: Art and Science, Addison-Wesley Professional, page 247
noun
plural Bobs
1. A generic male person.