Concept

Neuman–Stubblebine protocol

Summary
The Neuman–Stubblebine protocol is a computer network authentication protocol designed for use on insecure networks (e.g., the Internet). It allows individuals communicating over such a network to prove their identity to each other. This protocol utilizes time stamps, but does not depend on synchronized clocks. The protocol If Alice (A) initiates the communication to Bob (B) with S is a server trusted by both parties, the protocol can be specified as follows using security protocol notation:
  • A and B are identities of Alice and Bob respectively
  • M is a session identifier
  • K_{AS} is a symmetric key known only to A and S
  • K_{BS} is a symmetric key known only to B and S
  • N_A and N_B are nonces generated by A and B respectively
  • T_A and T_B are timestamps generated by A and B respectively
  • K_{AB} is a generated symmetric key, which will be the session key of the session between A a
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