{"id":668138,"date":"2026-05-07T11:54:53","date_gmt":"2026-05-07T09:54:53","guid":{"rendered":"https:\/\/migflug.com\/jetflights\/pentagon-quantum-proofing-f-35-post-quantum-cryptography\/"},"modified":"2026-05-07T11:54:53","modified_gmt":"2026-05-07T09:54:53","slug":"pentagon-quantum-proofing-f-35-post-quantum-cryptography","status":"publish","type":"post","link":"https:\/\/migflug.com\/jetflights\/pentagon-quantum-proofing-f-35-post-quantum-cryptography\/","title":{"rendered":"The Pentagon Is Quantum-Proofing the F-35"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\n\n<p>The F-35 Lightning II is, by some margin, the most networked combat aircraft ever built. A single jet exchanges several gigabytes of data per sortie with other F-35s, with E-3 and E-7 controllers, with ground stations, and \u2014 through the Multifunction Advanced Data Link (MADL) and Link 16 \u2014 with the rest of the joint force. Every byte of that traffic is encrypted.<\/p>\n\n<p>The encryption is the problem. Or rather: it will be.<\/p>\n\n<p>The U.S. Department of Defense has begun, quietly, the work of upgrading the F-35&#8217;s communications, navigation, and avionics encryption to algorithms that resist attack by quantum computers. The Pentagon will not say which programme office is leading the effort, nor exactly which subsystems are being modified first. But the existence of the programme has now been publicly confirmed, and the timing is no accident.<\/p>\n\n\n<div style=\"background:#f4f5f7;border-radius:8px;padding:18px 22px;margin:18px 0 28px;font-size:14.5px;line-height:1.7\"><p style=\"margin:0 0 8px;font-weight:600;color:#5C91FF;text-transform:uppercase;letter-spacing:.5px;font-size:12.5px\">Quick Facts<\/p><p style=\"margin:3px 0\"><strong>Aircraft:<\/strong> Lockheed Martin F-35 Lightning II<\/p><p style=\"margin:3px 0\"><strong>Subsystems affected:<\/strong> MADL, Link 16, GPS receivers, mission data files, ALIS \/ ODIN<\/p><p style=\"margin:3px 0\"><strong>Threat:<\/strong> Cryptographically Relevant Quantum Computer (CRQC)<\/p><p style=\"margin:3px 0\"><strong>Standards body:<\/strong> U.S. National Institute of Standards and Technology (NIST)<\/p><p style=\"margin:3px 0\"><strong>New algorithms:<\/strong> CRYSTALS-Kyber, CRYSTALS-Dilithium, FALCON, SPHINCS+ (NIST PQC standards)<\/p><p style=\"margin:3px 0\"><strong>Estimated timeline:<\/strong> First post-quantum cryptography updates 2027\u20132030<\/p><\/div>\n\n\n<h2 style=\"padding-top:22px\">The threat: harvest now, decrypt later<\/h2>\n\n<p>The risk is not theoretical. It is also not hypothetical. It is mathematical.<\/p>\n\n<p>Most of today&#8217;s encrypted military traffic relies on two algorithm families: RSA (asymmetric public-key encryption used during key exchange) and AES (symmetric encryption used to encrypt the data itself). RSA is vulnerable to Shor&#8217;s algorithm, a quantum-computing technique published in 1994 that, when run on a sufficiently large fault-tolerant quantum computer, can factor the large numbers RSA depends on for security. AES is vulnerable, more modestly, to Grover&#8217;s algorithm, which halves the effective key length.<\/p>\n\n<p>The practical consequence is straightforward. An adversary equipped with a Cryptographically Relevant Quantum Computer (CRQC) \u2014 one with several thousand error-corrected logical qubits \u2014 can decrypt today&#8217;s military communications. Such a computer does not yet exist outside research laboratories. Most credible estimates put first appearance in the early 2030s.<\/p>\n\n<p>The catch, and the reason for the urgency, is that an adversary does not need the quantum computer today to begin causing damage today. They simply need to record encrypted traffic now, store it, and decrypt it later when the hardware is available. This is the so-called &#8220;harvest now, decrypt later&#8221; threat, and it is the central reason every Western intelligence service has shifted from &#8220;post-quantum is a future problem&#8221; to &#8220;post-quantum is happening now.&#8221;<\/p>\n\n\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px\"><img data-opt-id=14141104  fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:4-0T.bbb1\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/jetflights\/wp-content\/uploads\/sites\/4\/2026\/05\/f-35-pilot-cockpit-data-link.jpg\" alt=\"F-35 pilot in the cockpit\" style=\"max-width:100%;height:auto;border-radius:6px\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">Every F-35 sortie generates encrypted radio, sensor, and data-link traffic that adversaries are believed to be recording today against future decryption. The Pentagon is now upgrading the cryptography that protects it. (US Air Force)<\/figcaption><\/figure>\n\n\n<h2 style=\"padding-top:22px\">What needs to change on the F-35<\/h2>\n\n<p>The F-35 carries a number of subsystems that depend on cryptography. The most important are:<\/p>\n\n<p><strong>1. Multifunction Advanced Data Link (MADL).<\/strong> The classified, low-probability-of-intercept data link used between F-35s for stealth-friendly cooperative operations. MADL exchanges sensor tracks, mission data, and engagement information at high data rates.<\/p>\n\n<p><strong>2. Link 16.<\/strong> The standard NATO tactical data link, used for everything from airborne radar pictures to friend-or-foe identification. Link 16 has its own encryption stack, separate from MADL.<\/p>\n\n<p><strong>3. M-code GPS.<\/strong> The next-generation military GPS signal, with stronger encryption and anti-jam properties. The receiver-side cryptography needs to be made quantum-resistant in step with the rest of the GPS ground segment.<\/p>\n\n<p><strong>4. Mission data files (MDFs) and software loads.<\/strong> The encrypted, signed data packages that tell the F-35 about threat radar emissions, threat parameters, and theatre-specific operating procedures. The signing infrastructure must remain secure against forgery in a post-quantum world.<\/p>\n\n<p><strong>5. ALIS \/ ODIN.<\/strong> The aircraft&#8217;s logistics and maintenance data system, which transmits aircraft health information back to depots. This is unclassified but operationally sensitive, and is a known intelligence target.<\/p>\n\n<p>Each of these subsystems must be re-engineered to use post-quantum algorithms \u2014 the family of NIST-approved primitives that includes CRYSTALS-Kyber for key exchange and CRYSTALS-Dilithium for digital signatures. The mathematical underpinning is different (lattice-based rather than integer-factoring), and the resulting key and signature sizes are larger than RSA equivalents \u2014 sometimes by an order of magnitude. That has practical implications for memory, bandwidth, and processing on a fighter aircraft.<\/p>\n\n\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px\"><img data-opt-id=415755474  fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:4-0T.bbb1\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/jetflights\/wp-content\/uploads\/sites\/4\/2026\/05\/iqm-quantum-computer-espoo.jpg\" alt=\"IQM superconducting quantum computer\" style=\"max-width:100%;height:auto;border-radius:6px\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">A superconducting quantum computer of the kind that may, in the next decade, be capable of breaking today&#8217;s public-key cryptography. The Pentagon is upgrading the F-35 ahead of that moment. (Wikimedia Commons)<\/figcaption><\/figure>\n\n\n<h2 style=\"padding-top:22px\">Why this matters now, not later<\/h2>\n\n<p>The F-35 is expected to be in service well into the 2070s. The aircraft delivered today will fly for a half-century. That timeline is longer than any reasonable estimate of when a CRQC will appear. An F-35 delivered in 2026 with RSA-protected data links is, in cryptographic terms, already obsolescent.<\/p>\n\n<p>The Pentagon&#8217;s current Block 4 modernisation already touches every major avionic subsystem on the aircraft. Folding post-quantum cryptography into Block 4 \u2014 or into the follow-on Tech Refresh 3 \/ 4 baselines \u2014 is the most efficient way to handle the migration. The alternative is a separate, schedule-sensitive cryptographic upgrade later, which will be costlier and more disruptive.<\/p>\n\n<p>It is also worth noting that any post-quantum upgrade to the F-35 has to be matched on the other end of the link. The E-7, E-3, KC-46, B-21, the Navy&#8217;s E-2D, and every coalition aircraft that talks to an F-35 must run the same algorithms. The Pentagon is therefore not only quantum-proofing the Lightning II \u2014 it is quantum-proofing the entire networked combat enterprise. This is a multi-year, multi-service programme, and the F-35 is simply the most visible aircraft in it.<\/p>\n\n<h2 style=\"padding-top:22px\">A sober conclusion<\/h2>\n\n<p>None of this is glamorous. There is no flight-test pilot pulling 9G turns. There are no kill markings on a fuselage. The work consists of quiet engineers replacing one set of mathematical primitives with another, validating performance impact on cockpit avionics, regression-testing every data link, and slowly pushing the result into operational squadrons.<\/p>\n\n<p>What it preserves, if it succeeds, is the F-35&#8217;s ability to function as a stealthy, networked, low-probability-of-intercept node well into the second half of the twenty-first century. Which, when the alternative is a fleet of expensive jets passing classified information that an adversary will read at leisure twenty years later, is a programme worth running.<\/p>\n\n<p style=\"margin-top:24px\"><em>Sources: U.S. Department of Defense, NIST Post-Quantum Cryptography programme, Defense Blog, Aviation Week.<\/em><\/p>\n\n\n<div style=\"background:#f0f4ff;border-left:4px solid #5C91FF;padding:16px 20px;margin:32px 0 8px;border-radius:0 8px 8px 0\"><p style=\"margin:0 0 8px;font-weight:600;color:#333\">Related Posts<\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/jetflights\/the-f-22-can-now-fight-blind-jam-resistant-navigation-goes-operational\/\">The F-22 Can Now Fight Blind: Jam-Resistant Navigation Goes Operational<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/jetflights\/how-m-code-gps-works-and-why-enemies-cant-jam-it\/\">How M-Code GPS Works \u2014 and Why Enemies Can&#8217;t Jam It<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/jetflights\/what-an-hour-of-f-35-time-actually-costs\/\">What an Hour of F-35 Time Actually Costs<\/a><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>The F-35 Lightning II is, by some margin, the most networked combat aircraft ever built. A single jet exchanges several gigabytes of data per sortie with other F-35s, with E-3 and E-7 controllers, with ground stations, and \u2014 through the Multifunction Advanced Data Link (MADL) and Link 16 \u2014 with the rest of the joint [&hellip;]<\/p>\n","protected":false},"author":23,"featured_media":668110,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"F-35 quantum cryptography","_yoast_wpseo_title":"The Pentagon Is Quantum-Proofing the F-35 \u2014 Here's How","_yoast_wpseo_metadesc":"The U.S. DoD is upgrading the F-35's MADL, Link 16, M-code GPS and mission data files to post-quantum cryptography to defeat 'harvest now, decrypt later' attacks.","_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","editor_notices":[],"footnotes":""},"categories":[664,670],"tags":[],"class_list":["post-668138","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-military-aviation","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The Pentagon Is Quantum-Proofing the F-35 \u2014 Here&#039;s How<\/title>\n<meta name=\"description\" content=\"The U.S. DoD is upgrading the F-35&#039;s MADL, Link 16, M-code GPS and mission data files to post-quantum cryptography to defeat &#039;harvest now, decrypt later&#039; attacks.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/migflug.com\/jetflights\/pentagon-quantum-proofing-f-35-post-quantum-cryptography\/\" 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