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In what ways would you simplify? What would be changed to be more modern or extensible? Suppose you have no requirement to adapt to previous protocols. Links to proposed designs, existing protocols, as well as any ideas are welcome.

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closed as too broad by Maarten Bodewes, Gilles, otus, CodesInChaos Sep 19 '15 at 15:53

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ Personally, I'd include something like CONIKS from the start on. Otherwise default to something like Ed448 and Curve448, use AES and prepare yourself for the rise of quantum computers. $\endgroup$ – SEJPM Sep 18 '15 at 18:32
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    $\begingroup$ BTW.: This question may be waaaaay to broad and Crypto.SE is no disuscussion forum but rather a Question & Answer site. You may want to break your question down into smaller parts for receiving better answers. $\endgroup$ – SEJPM Sep 18 '15 at 18:34

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