{"id":53829,"date":"2023-09-20T20:28:11","date_gmt":"2023-09-20T20:28:11","guid":{"rendered":"https:\/\/www.threatshub.org\/blog\/signal-adopts-new-alphabet-jumble-to-protect-chats-from-quantum-computers\/"},"modified":"2023-09-20T20:28:11","modified_gmt":"2023-09-20T20:28:11","slug":"signal-adopts-new-alphabet-jumble-to-protect-chats-from-quantum-computers","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/signal-adopts-new-alphabet-jumble-to-protect-chats-from-quantum-computers\/","title":{"rendered":"Signal adopts new alphabet jumble to protect chats from quantum computers"},"content":{"rendered":"<p>Signal has adopted a new key agreement protocol in an effort to keep encrypted Signal chat messages protected from any future quantum computers.<\/p>\n<p>Quantum computers \u2013 which every decade experts believe may be able to crack today&#8217;s encryption schemes within the next decade or two \u2013 aren&#8217;t particularly useful at the moment.<\/p>\n<p>&#8220;Although quantum computers already exist, the systems known to exist today do not yet have enough qubits to pose a threat to the public-key cryptography that Signal currently uses,&#8221; noted Ehren Kret, chief technology officer at Signal, in <a href=\"https:\/\/signal.org\/blog\/pqxdh\/\">a write-up<\/a>. &#8220;However, if a sufficiently powerful quantum computer were built in the future, it could be used to compute a private key from a public key thereby breaking encrypted messages.&#8221;<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"condor\" data-xsm=\",fluid,mpu,\" data-sm=\",fluid,mpu,\" data-md=\",fluid,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2ZRDONhbLLgXg@AaWSJm0RAAAAFI&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2ZRDONhbLLgXg@AaWSJm0RAAAAFI&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>Researchers around the world, many in nations the US considers adversaries, are working hard to do just that. For instance, a recent <a href=\"https:\/\/arxiv.org\/abs\/2308.06572\">preprint paper<\/a> from Oded Regev, a New York University computer science professor, has proposed a quantum factoring algorithm that is claimed to be more efficient than the one proposed by Peter Shor (<a href=\"https:\/\/www.nature.com\/articles\/s41598-021-95973-w\">Shor&#8217;s algorithm<\/a>). If Regev&#8217;s method can be successfully implemented, it could allow the factoring of integers (and exposure of cryptographic keys) with fewer quantum gates \u2013 a machine easier to realize in the near term.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"falcon\" data-xmd=\",fluid,mpu,leaderboard,\" data-lg=\",fluid,mpu,leaderboard,\" data-xlg=\",fluid,billboard,superleaderboard,mpu,leaderboard,\" data-xxlg=\",fluid,billboard,superleaderboard,brandwidth,brandimpact,leaderboard,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44ZRDONhbLLgXg@AaWSJm0RAAAAFI&amp;t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44ZRDONhbLLgXg@AaWSJm0RAAAAFI&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<div class=\"adun_eagle_desktop_story_wrapper\">\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"mid\" data-raptor=\"eagle\" data-xxlg=\",mpu,dmpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33ZRDONhbLLgXg@AaWSJm0RAAAAFI&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33ZRDONhbLLgXg@AaWSJm0RAAAAFI&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<\/p><\/div>\n<p>This type of attack \u2013 known as Harvest Now, Decrypt Later, because it involves grabbing as much encrypted data as possible today to crack in future \u2013 has been of sufficient concern that the US National Institute for Standards and Technology (NIST) in 2016 called for the development of quantum-resistant encryption algorithms.<\/p>\n<p>With NIST&#8217;s selection of <a href=\"https:\/\/pq-crystals.org\/kyber\/index.shtml\">CRYSTALS-Kyber<\/a> and three other algorithms for its post-quantum cryptographic standard last year, private sector firms in the US now have some tested algorithms to work with and have started to roll out their own technology for keeping data secure after the anticipated quantum leap.<\/p>\n<p>In August, for example, Google <a href=\"https:\/\/www.theregister.com\/2023\/08\/12\/google_chrome_kem\/\">said<\/a> Chrome 116 includes support for <a href=\"https:\/\/www.ietf.org\/archive\/id\/draft-tls-westerbaan-xyber768d00-02.html\">X25519Kyber768<\/a>, a hybrid key encapsulation mechanism (KEM) to safeguard symmetric encryption secrets during secure TLS network connections.<\/p>\n<p>And in May, it was Microsoft <a href=\"https:\/\/blogs.microsoft.com\/blog\/2023\/05\/31\/building-a-quantum-safe-future\/\">talking up<\/a> the steps it has been taking to prepare for post-quantum cryptography.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"falcon\" data-xsm=\",fluid,mpu,\" data-sm=\",fluid,mpu,\" data-md=\",fluid,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44ZRDONhbLLgXg@AaWSJm0RAAAAFI&amp;t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44ZRDONhbLLgXg@AaWSJm0RAAAAFI&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>Basically, we&#8217;re in the midst of a speculative upgrade cycle based on compliance concerns. Those who have encrypted data, particularly government entities, want some assurance that their information and chatter will remain confidential for years to come.<\/p>\n<p>Signal, consistently <a href=\"https:\/\/www.eff.org\/deeplinks\/2018\/03\/why-we-cant-give-you-recommendation\">mentioned alongside WhatsApp<\/a> as probably the best choice for secure chat messaging, is upgrading its <a href=\"https:\/\/signal.org\/docs\/specifications\/x3dh\/\">X3DH<\/a> (&#8220;Extended Triple Diffie-Hellman&#8221;) specification to <a href=\"https:\/\/signal.org\/docs\/specifications\/pqxdh\/\">PQXDH<\/a> (&#8220;Post-Quantum Extended Diffie-Hellman&#8221;).<\/p>\n<p>&#8220;With this upgrade, we are adding a layer of protection against the threat of a quantum computer being built in the future that is powerful enough to break current encryption standards,&#8221; said Kret.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" id=\"story_eagle_xsm_sm_md_xmd_lg_xlg\" data-pos=\"mid\" data-raptor=\"eagle\" data-xsm=\",mpu,dmpu,\" data-sm=\",mpu,dmpu,\" data-md=\",mpu,dmpu,\" data-xmd=\",mpu,dmpu,\" data-lg=\",mpu,dmpu,\" data-xlg=\",mpu,dmpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33ZRDONhbLLgXg@AaWSJm0RAAAAFI&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33ZRDONhbLLgXg@AaWSJm0RAAAAFI&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>As described in the PQXDH paper, PQXDH is designed for asynchronous communication via a server where a shared secret key needs to be established between two parties (Alice and Bob) who can authenticate one another based on their respective public keys.<\/p>\n<p>PQXDH uses both the elliptic curve key agreement protocol X25519 and CRYSTALS-Kyber and combines the two secrets, so that Signal does not have to toss its established elliptic curve foundation. This means the attacker must break both to calculate the shared secret key.<\/p>\n<p>Kret says that Signal&#8217;s client software already supports PQXDH and in a few months X3DH will be disabled. This should help defend present and past data against a future quantum computer. For scenarios in which a quantum computer is actively intercepting and eavesdropping chat comms, further mitigations are anticipated. \u00ae<\/p>\n<p> READ MORE <a href=\"https:\/\/go.theregister.com\/feed\/www.theregister.com\/2023\/09\/20\/signal_adopts_new_alphabet_jumble\/\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>X3DH readied for retirement as PQXDH is rolled out Signal has adopted a new key agreement protocol in an effort to keep encrypted Signal chat messages protected from any future quantum computers.\u2026 READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[63],"tags":[],"class_list":["post-53829","post","type-post","status-publish","format-standard","hentry","category-the-register"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 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