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    <div class="logo-container"> <img src="logo-circular.png" class="logo" > </div>
    <div class="title-buttons">
    <a href="index.html"><h1 class="project-tagline">Squirrel Prover</h2></a>
    <a class="btn" href="https://github.com/squirrel-prover/squirrel-prover/#readme"><i class="fa fa-laptop"></i> Install</a>
    <a class="btn" href="https://squirrel-prover.github.io/jsquirrel/?open=0-logic.sp"><i class="fa fa-th-large"></i> Try Squirrel</a>
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    <a class="btn" href="events.html"><i class="fa fa-calendar"></i> Events</a>
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  <div>
    <section class="main-content">

      <h1></h1>

<!-- do not indent this line, may cause indentation problems in fenced code blocks! -->
<p>The <strong>Squirrel Prover</strong> is a proof assistant dedicated
to cryptographic protocols. It relies on a higher-order logic following
the <em>computationnally complete symbolic attacker</em> approach. It
thus provides guarantees in the computational model.</p>
<h1 id="getting-started">Getting started</h1>
<p>A 13 minutes introduction to the basic concepts and core ideas of the
<strong>Squirrel Prover</strong> can be found <a
href="https://www.youtube.com/watch?v=n-s_lGe44EM">here</a>.</p>
<p>A <a
href="https://github.com/squirrel-prover/squirrel-prover/#readme">README</a>
provides installation instructions.</p>
<p>You can also try our <strong>online version</strong> <a
href="https://squirrel-prover.github.io/jsquirrel/">here</a>.</p>
<h1 id="documentation">Documentation</h1>
<p>The documentation can be found <a
href="https://squirrel-prover.github.io/documentation/">here</a>.</p>
<h1 id="tutorial">Tutorial</h1>
<p>You may get started with this <a
href="https://squirrel-prover.github.io/documentation/tutorial.html">tutorial</a>,
or commented examples available in our <a
href="https://squirrel-prover.github.io/jsquirrel/">browser-based
prover</a>. More complete tutorials have been prepared on the occasion
of several summer schols; see the <a href="events.html">events</a>
page.</p>
<p>A high-level introduction to the theory behind Squirrel was published
in the ACM Siglog newsletter <span class="citation"
data-cites="BDJKL24"><a href="#ref-BDJKL24"
role="doc-biblioref">[1]</a></span>. The formal technical details are
inside the research papers:</p>
<ul>
<li>the computationnally complete symbolic attacker was proposed in
<span class="citation" data-cites="BC14"><a href="#ref-BC14"
role="doc-biblioref">[2]</a></span>;</li>
<li>the tool Squirrel was introduced in <span class="citation"
data-cites="BDKJM-sp21"><a href="#ref-BDKJM-sp21"
role="doc-biblioref">[3]</a></span> as a proof assistant for a
meta-logic on top of the logic of <span class="citation"
data-cites="BC14"><a href="#ref-BC14"
role="doc-biblioref">[2]</a></span>;</li>
<li>the meta-logic was later adapted to support protocols with mutable
state <span class="citation" data-cites="BDKM-csf22"><a
href="#ref-BDKM-csf22" role="doc-biblioref">[4]</a></span>;</li>
<li>a post-quantum sound variant of the logic, meta-logic and tool have
been given in <span class="citation" data-cites="CFJ-sp22"><a
href="#ref-CFJ-sp22" role="doc-biblioref">[5]</a></span>;</li>
<li>recently, the meta-logic approach has been abandonned in favor of a
self-contained higher-order logic <span class="citation"
data-cites="BKL23"><a href="#ref-BKL23"
role="doc-biblioref">[6]</a></span>.</li>
</ul>
<h1 id="team">Team</h1>
<ul>
<li><a href="http://www.lsv.fr/~baelde/">David Baelde</a>, <em>ENS
Rennes, Univ Rennes, CNRS, IRISA</em></li>
<li><a href="http://people.irisa.fr/Stephanie.Delaune/">Stéphanie
Delaune</a>, <em>Univ Rennes, CNRS, IRISA</em></li>
<li><a href="http://www.lsv.fr/~fontaine/index.html.fr">Caroline
Fontaine</a>, <em>Université Paris-Saclay, CNRS, LMF</em></li>
<li><a href="https://charlie.jacomme.fr">Charlie Jacomme</a>,
<em>Université de Lorraine, LORIA, Inria Nancy Grand-Est</em></li>
<li><a href="https://adrienkoutsos.fr/">Adrien Koutsos</a>, <em>Inria
Paris</em></li>
<li><a href="https://people.irisa.fr/Joseph.Lallemand/">Joseph
Lallemand</a>, <em>Univ Rennes, CNRS, IRISA</em></li>
<li><a href="https://people.irisa.fr/Clement.Herouard/">Clément
Herouard</a>, <em>Univ Rennes, CNRS, IRISA</em></li>
<li><a
href="https://fr.linkedin.com/in/justine-sauvage-a05b35179">Justine
Sauvage</a>, <em>Inria Paris</em></li>
</ul>
<p>Former members:</p>
<ul>
<li><a href="https://nguyentito.eu/">Tito Nguyen</a>, <em>formerly
IRISA, now at LIS / Aix-Mariseille University</em></li>
<li><a
href="https://pages.saclay.inria.fr/toccata/solene.moreau/">Solène
Moreau</a>, <em>formerly IRISA, now at AdaCore</em></li>
<li><a href="https://people.irisa.fr/Thomas.Rubiano/">Thomas
Rubiano</a>, <em>formerly Univ Rennes, CNRS, IRISA</em></li>
</ul>
<h1 id="source-code">Source code</h1>
<p><strong>Squirrel</strong> is an open source project, licensed under
the MIT License. All source code is available <a
href="https://github.com/squirrel-prover/squirrel-prover/">here</a>.</p>
<h1 class="unnumbered" id="publications">Publications</h1>
<div id="refs" class="references csl-bib-body" role="list">
<div id="ref-BDJKL24" class="csl-entry" role="listitem">
<div class="csl-left-margin">[1] </div><div class="csl-right-inline">D.
Baelde, S. Delaune, C. Jacomme, A. Koutsos, and J. Lallemand,
<span>“<span class="nocase">The Squirrel Prover and its
Logic</span>,”</span> in <em><span>ACM SIGLOG News</span></em>, 2024,
vol. 11, <a
href="https://inria.hal.science/hal-04579038">https://inria.hal.science/hal-04579038</a>.</div>
</div>
<div id="ref-BC14" class="csl-entry" role="listitem">
<div class="csl-left-margin">[2] </div><div class="csl-right-inline">G.
Bana and H. Comon-Lundh, <span>“<span class="nocase">A Computationally
Complete Symbolic Attacker for Equivalence Properties</span>,”</span> in
<em><span class="nocase">2014 ACM SIGSAC Conference on Computer and
Communications Security</span></em>, 2014, pp. 609–620, <a
href="https://hal.inria.fr/hal-01102216">https://hal.inria.fr/hal-01102216</a>.</div>
</div>
<div id="ref-BDKJM-sp21" class="csl-entry" role="listitem">
<div class="csl-left-margin">[3] </div><div class="csl-right-inline">D.
Baelde, S. Delaune, A. Koutsos, C. Jacomme, and S. Moreau, <span>“An
<span>Interactive</span> <span>Prover</span> for <span>Protocol</span>
<span>Verification</span> in the <span>Computational</span>
<span>Model</span>,”</span> in <em><span>P</span>roceedings of the 42nd
<span>IEEE</span> <span>Symposium</span> on <span>Security</span> and
<span>Privacy</span> (<span>S</span>&amp;<span>P</span>’21)</em>, 2021,
<a
href="https://hal.inria.fr/hal-03172119">https://hal.inria.fr/hal-03172119</a>.</div>
</div>
<div id="ref-BDKM-csf22" class="csl-entry" role="listitem">
<div class="csl-left-margin">[4] </div><div class="csl-right-inline">D.
Baelde, S. Delaune, A. Koutsos, and S. Moreau, <span>“<span
class="nocase">Cracking the Stateful Nut</span>,”</span> in
<em><span>CSF 2022 - 35th IEEE Computer Security Foundations
Symposium</span></em>, 2022, <a
href="https://hal.archives-ouvertes.fr/hal-03500056">https://hal.archives-ouvertes.fr/hal-03500056</a>.</div>
</div>
<div id="ref-CFJ-sp22" class="csl-entry" role="listitem">
<div class="csl-left-margin">[5] </div><div class="csl-right-inline">C.
Cremers, C. Fontaine, and C. Jacomme, <span>“A <span>Logic</span> and an
<span>Interactive</span> <span>Prover</span> for the
<span>Computational</span> <span>Post-Quantum</span>
<span>Security</span> of <span>Protocols</span>,”</span> in
<em><span>P</span>roceedings of the 43nd <span>IEEE</span>
<span>Symposium</span> on <span>Security</span> and <span>Privacy</span>
(<span>S</span>&amp;<span>P</span>’22)</em>, 2022, <a
href="https://hal.inria.fr/hal-03620358">https://hal.inria.fr/hal-03620358</a>.</div>
</div>
<div id="ref-BKL23" class="csl-entry" role="listitem">
<div class="csl-left-margin">[6] </div><div class="csl-right-inline">D.
Baelde, A. Koutsos, and J. Lallemand, <span>“A higher-order
indistinguishability logic for cryptographic reasoning,”</span> in
<em>2023 38th annual ACM/IEEE symposium on logic in computer science
(LICS)</em>, 2023, pp. 1–13, <a
href="https://hal.inria.fr/hal-03981949">https://hal.inria.fr/hal-03981949</a>.</div>
</div>
<div id="ref-bideduction-to-appear" class="csl-entry" role="listitem">
<div class="csl-left-margin">[7] </div><div class="csl-right-inline">D.
Baelde, A. Koutsos, and J. Sauvage, <span>“Foundations for cryptographic
reductions in <span>CCSA</span> logics,”</span> in
<em><span>CCS</span></em>, 2024, pp. to appear, <a
href="https://inria.hal.science/hal-04511718">https://inria.hal.science/hal-04511718</a>.</div>
</div>
<div id="ref-concrete-security" class="csl-entry" role="listitem">
<div class="csl-left-margin">[8] </div><div class="csl-right-inline">D.
Baelde, C. Fontaine, A. Koutsos, G. Scerri, and T. Vignon, <span>“A
probabilistic logic for concrete security,”</span> in
<em><span>CSF</span></em>, 2024, pp. 324–339, <a
href="https://inria.hal.science/hal-04577828">https://inria.hal.science/hal-04577828</a>.</div>
</div>
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