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    <h1 class="hero-title">
      <span class="hero-title-line" style="margin: 0 0 20px 0">Making Routing Protocols</span>
      <span class="hero-title-line gradient-text">More Secure</span>
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    <p class="hero-subtitle">
      Ensuring network security is vital to safeguarding network systems
      and preventing cyberattacks. We study diverse
      network protocols (including OSPF, ISIS, BABEL, BGP, etc.) through formal analysis and intelligent approaches.
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        <div class="stat-value c1">100+</div>
        <div class="stat-label">Protocol Bugs Found</div>
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        <div class="stat-value c2">12+</div>
        <div class="stat-label">Protocols Analyzed</div>
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      <a href="spar.html" class="project-card reveal">
        <div class="project-card-image"><img src="static/images/spar.png" width=88%/></div>
        <div class="project-card-body">
          <h3>SPAR</h3>
          <p>LLM-driven generation of verified format specifications for network protocols via adversarial refinement.</p>
          <span class="project-card-tag">USENIX Security 2026</span>
          <span class="project-card-tag" style="background:rgba(14,165,233,0.12);color:var(--accent-3);margin-left:0.4rem;">New</span>
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      <a href="https://qingkaishi.github.io/public_pdfs/CAV26.pdf" class="project-card reveal">
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          <h3>SEAL</h3>
          <p>A theoretical abstract interpretation framework for building symbolic automata from stateful systems.</p>
          <span class="project-card-tag">CAV 2026</span>
          <span class="project-card-tag" style="background:rgba(14,165,233,0.12);color:var(--accent-3);margin-left:0.4rem;">New</span>
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          <h3>ToDiff</h3>
          <p>Building equivalent topological configurations for differential testing, supporting OSPF, IS-IS, RIP, BABEL, etc.</p>
          <span class="project-card-tag">ACM CCS 2025</span>
          <span class="project-card-tag" style="background:rgba(14,165,233,0.12);color:var(--accent-3);margin-left:0.4rem;">New</span>
        </div>
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        <div class="project-card-image"><img src="static/images/parclease.png" width=88%/></div>
        <div class="project-card-body">
          <h3>ParCleanse</h3>
          <p>LLM-driven generation of protocol format specifications from RFC documents via divide and conquer.</p>
          <span class="project-card-tag">ACM ISSTA 2025</span>
        </div>
      </a>
      <a href="https://qingkaishi.github.io/public_pdfs/OOPSLA2024.pdf" class="project-card reveal">
        <div class="project-card-image"><img src="static/images/pardiff.png" width=88%/></div>
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          <h3>ParDiff</h3>
          <p>Differential testing based on format specification lifted from multiple implementations of the same protocol.</p>
          <span class="project-card-tag">ACM OOPSLA 2024</span>
          <span class="project-card-tag" style="background:rgba(14,165,233,0.12);color:var(--accent-3);margin-left:0.4rem;">Distinguished Paper</span>
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      <a href="https://qingkaishi.github.io/public_pdfs/CCS23.pdf" class="project-card reveal">
        <div class="project-card-image"><img src="static/images/netlifter.png" width=88%/></div>
        <div class="project-card-body">
          <h3>NetLifter</h3>
          <p>Lifting protocol format specification from a top-down (or recursive-descent) protocol packet parser.</p>
          <span class="project-card-tag">ACM CCS 2023</span>
        </div>
      </a>
      <a href="https://qingkaishi.github.io/public_pdfs/SEC23.pdf" class="project-card reveal">
        <div class="project-card-image"><img src="static/images/statelifter.png" width=88%/></div>
        <div class="project-card-body">
          <h3>StateLifter</h3>
          <p>Lifting protocol format specification from a state-machine parser, which is common in embedded systems for low lentency.</p>
          <span class="project-card-tag">USENIX Security 2023</span>
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