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<p>Even the use of secure primitives like AES or RSA does not guarantee that the end-result is secure as well. In recent years breaks of modern primitives have in fact become exceedingly rare, yet stories like the KRACK-attack or ROBOT keep appearing.</p>
<p>The obvious answer to these problems would be to proof that our protocols are secure. While that may sound great in theory, there are many issues as well:</p>
<li>Proving (almost) anything secure, would require to solve a millennium-problem.</li>
<li>Given the above, assumptions are required; but which assumptions are reasonable?</li>
<li>The word “secure” may seem intuitive, but can we formally define it? And can something be <em>too</em> secure?</li>
<li>Idealizing primitives can solve many problems, but what about over-idealizations?</li>
<li>Can backdoors be necessary to prove security?</li>
<li>A proof can only show the absence of attacks in a certain model. What about attacks outside those models?</li>