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Neuman–Stubblebine protocol : ウィキペディア英語版
Neuman–Stubblebine protocol
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_ is a symmetric key known only to A and S
* K_ 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_ is a generated symmetric key, which will be the session key of the session between A and B
A \rightarrow B: A, N_A
:Alice notified Bob of intent to initiate secure communication.
B \rightarrow S: B, N_B, \_, T_B\}_, T_B\}_, T_B\}__{K_{AB}}
Alice forwards the message and verifies N_A is the same that she generated earlier. Bob will verify T_B and N_B have not changed when he receives the message.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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