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Most of the proofs that I have seen for cryptographic protocol include completeness and soundness.

  • Why do we always prove completeness and soundness?
  • Why do we not also see other propertes such as "validity", "consistency", "integrity"?
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  • $\begingroup$ To clarify your question: Rather than write "most of the proofs I have seen for cryptographic protocol..." maybe write "the proofs I have seen for <<examples of cryptographic protocols where you have seen them>>..." $\endgroup$
    – user2768
    Apr 19, 2017 at 9:51
  • $\begingroup$ Perhaps we've looked at different proofs, which is why most of the proofs I have seen don't include completeness and soundness. Nonetheless, let me try to advise upon why completeness and soundness are useful. Soundness says that something is valid (thus, I can't prove something that isn't valid). Completeness says that everything valid can be shown (thus, nothing is considered invalid when it isn't). $\endgroup$
    – user2768
    Apr 19, 2017 at 9:55

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