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    <title>Q-Day Check - Verified Briefings &amp; Guides</title>
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    <description>Filter verified post-quantum TLS 1.3 engineering guides and dated standards advisories across NIST FIPS 203-205, OpenSSL 3.5+, OpenSSH 9.9+, and CycloneDX v1.6 CBOM workflows.</description>
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    <lastBuildDate>Fri, 06 Nov 2026 00:00:00 GMT</lastBuildDate>
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      <title>Reference Sweep: Major Standards &amp; Package Portals Negotiate Hybrid 0x11EC Over Port 443</title>
      <link>https://qdaycheck.com/updates/#pqc-2026-edge-adoption</link>
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      <pubDate>Fri, 06 Nov 2026 00:00:00 GMT</pubDate>
      <description>Wire-level TLS 1.3 ServerHello verification across reference developer and standards origins shows hybrid X25519MLKEM768 (0x11EC, 1,120-byte server share) active on CDN-fronted endpoints while several major code hosts remain on classical 32-byte X25519. Actionable takeaway: Test both CDN edge hostnames and direct origin load balancers separately; CDN edge termination does not automatically protect origin-to-origin mTLS. (Source: IETF Hybrid Key Exchange in TLS 1.3 Specification)</description>
      <category>TLS-1.3</category>
      <category>IANA-0x11EC</category>
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    <item>
      <title>OpenSSL 4.1.0</title>
      <link>https://qdaycheck.com/updates/#upstream-openssl-4-1-0</link>
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      <pubDate>Fri, 23 Oct 2026 00:00:00 GMT</pubDate>
      <description>OpenSSL 4.1.0 is a feature release adding significant new functionality to OpenSSL. This release incorporates the following potentially significant or incompatible changes: Added VC-WIN32-MSVC2013 and VC-WIN64A-MSVC2013 build targets to... Actionable takeaway: Review OpenSSL changelog notes for TLS 1.3 ML-KEM / ML-DSA provider updates across ingress containers. (Source: OpenSSL Project Releases)</description>
      <category>OpenSSL</category>
      <category>TLS-1.3</category>
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    <item>
      <title>OpenSSL 3.5 Ships Built-In ML-KEM, ML-DSA &amp; SLH-DSA Without Out-of-Tree Providers</title>
      <link>https://qdaycheck.com/updates/#openssl-35-native-mlkem</link>
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      <pubDate>Tue, 08 Apr 2025 00:00:00 GMT</pubDate>
      <description>OpenSSL 3.5 integrated native FIPS 203, FIPS 204, and FIPS 205 implementations and enabled hybrid X25519MLKEM768 negotiation directly in libssl group configuration lists. Actionable takeaway: Prioritise OpenSSL 3.5+ base images in container and reverse-proxy build pipelines to retire legacy oqs-provider forks. (Source: OpenSSL Release Advisories)</description>
      <category>OpenSSL</category>
      <category>FIPS-203</category>
      <category>ML-KEM</category>
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    <item>
      <title>NIST IR 8547 Establishes 2030 Deprecation and 2035 Disallowance Targets</title>
      <link>https://qdaycheck.com/updates/#nist-ir-8547-timeline</link>
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      <pubDate>Tue, 12 Nov 2024 00:00:00 GMT</pubDate>
      <description>NIST Initial Public Draft IR 8547 set a concrete 2030 deprecation milestone and 2035 disallowance milestone for quantum-vulnerable RSA, ECDSA, EdDSA, and classical ECDH. Actionable takeaway: Align multi-year PKI root rotation and hardware HSM procurement cycles to complete classical deprecation ahead of 2030. (Source: NIST IR 8547 Publication)</description>
      <category>Standards</category>
      <category>Mosca-Horizon</category>
      <category>FIPS-203</category>
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    <item>
      <title>OpenSSH 9.9 Adopts mlkem768x25519-sha256 Default Hybrid Key Exchange</title>
      <link>https://qdaycheck.com/updates/#openssh-99-hybrid-kex</link>
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      <pubDate>Thu, 19 Sep 2024 00:00:00 GMT</pubDate>
      <description>OpenSSH 9.9 promoted FIPS 203 ML-KEM-768 paired with X25519 ahead of Streamlined NTRU Prime for administrative SSH transport. Actionable takeaway: Pin KexAlgorithms mlkem768x25519-sha256 in /etc/ssh/sshd_config across bastion and jump hosts. (Source: OpenSSH 9.9 Release Notes)</description>
      <category>OpenSSH</category>
      <category>ML-KEM</category>
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