High Assurance Softwarehttps://bsky.app/profile/cryspen.comhttps://bsky.app/profile/cryspen.com/post/3mgmwoffhf42mAlex will be speaking at Leaning In! 2026 in Berlin this Thursday, March 12. In his presentation, "Verifying security-critical Rust code with Lean," he will introduce Hax, Cryspen's toolchain for transpiling annotated Rust into monadic Lean code. Event details: buff.ly/YcuZTVB https://leaning.in/2026/09 Mar 2026 13:12 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3mgmwoffhf42mhttps://bsky.app/profile/cryspen.com/post/3mdx3y2jmno2x🚀 Protect your data against harvest-now-decrypt-later attacks with PSQ! We’ve built a lightweight, hybrid post-quantum protocol that injects HNDL security into your existing protocols. The easiest way to start your post-quantum transition today without rewriting your entire stack. buff.ly/irOf0lH https://cryspen.com/post/psq-announce/03 Feb 2026 09:58 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3mdx3y2jmno2xhttps://bsky.app/profile/cryspen.com/post/3mctvmvvlmx2x🚀 We’re growing! Cryspen is hiring. Are you passionate about high-assurance software or cutting-edge cryptography? We are looking for talented individuals to join our team. 🔹 Compiler and Verification Tools Engineer 🔹 Cryptography Engineer 👉 Apply here: buff.ly/J9TF6NB #Hiring #TechJobs https://join.com/companies/cryspen20 Jan 2026 10:01 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3mctvmvvlmx2xhttps://bsky.app/profile/cryspen.com/post/3m7pszb4iyi2kNew blog post is live! 🦀 We used hax and F* to formally verify termination and panic freedom for a small real-world Rust crate. We also put Kani, Verus, and Aeneas to the test on the same code, exploring the different approaches, challenges, and proof efforts required by each tool. buff.ly/h5bG37W https://hax.cryspen.com/blog/2025/12/08/verifying-a-real-world-rust-crate/11 Dec 2025 14:48 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3m7pszb4iyi2khttps://bsky.app/profile/cryspen.com/post/3m6gw4usf4m2wCatch Karthik, our Chief Researcher, at the European Conference on PQC Migration next week, where he will be championing the need for the EU to implement provably secure protocols and high-assurance software. See you there? 👋 📅 Dec 2-3, 2025 🔗 buff.ly/w3XMpJQ #PQC #EU25 Nov 2025 08:25 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3m6gw4usf4m2whttps://bsky.app/profile/cryspen.com/post/3m5spv77xsm22We're thrilled to welcome Alexander Bentkamp to the Cryspen family! Alex joins our Tools and Proofs team with a deep background in automated and interactive theorem proving. Welcome aboard, Alex! buff.ly/jsJHshv https://cryspen.com/post/welcome_alex/17 Nov 2025 07:40 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3m5spv77xsm22https://bsky.app/profile/cryspen.com/post/3m4pkhjreuf2fHeaded to #escar this week? ​Catch Franziskus talking high assurance crypto. And don't miss Karthik's keynote at the "PQC Migration & Supply Chain Readiness" workshop. Lets connect and talk #verification and #cryptography. buff.ly/UPf2MiN ​#AutomotiveSecurity #PQC #Crypto #SupplyChain https://escar.info/escar-europe/03 Nov 2025 08:00 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3m4pkhjreuf2fhttps://bsky.app/profile/cryspen.com/post/3m4d64stuum2uExcited to share our latest work on formally verifying the Rust standard library! We developed a new methodology to specify and test the Rust core library, helping to find and fix a bug in Rust's platform-specific SIMD functions. Learn more about our approach: buff.ly/IwMkWVm https://cryspen.com/post/specify-rust-simd/29 Oct 2025 09:47 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3m4d64stuum2uhttps://bsky.app/profile/cryspen.com/post/3m32ngq43qa2nIn Taipei for CCS 2025? 🇹🇼 Our CEO, Franziskus Kiefer, is giving a talk on Formal Security & Functional Verification of Crypto Protocols in Rust. Don't miss the chance to connect. Franziskus is keen to discuss the future of secure software development and cryptography. https://buff.ly/5Ycq33B13 Oct 2025 07:02 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3m32ngq43qa2nhttps://bsky.app/profile/cryspen.com/post/3m2lkkxebbp2sAttending the OpenSSL conference? 🗣️ Our Chief Researcher, Karthikeyan Bhargavan, is giving a talk on high assurance post-quantum cryptography. He'd love to connect, so come find him for a chat about the future of crypto! buff.ly/JIGSr0L #OpenSSL #PQC #PostQuantum #Cryptography #Cybersecurity https://buff.ly/JIGSr0L07 Oct 2025 07:01 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3m2lkkxebbp2shttps://bsky.app/profile/cryspen.com/post/3m2j24ab2wx2nWe're excited to see the release of Signal's new post-quantum ratcheting protocol, SPQR! We are proud to have collaborated with the Signal team on the formal analysis of the design and implementation of this. Learn more on our blog buff.ly/Zi3rCBs and in Signal's announcement buff.ly/Srroli9 https://buff.ly/Zi3rCBs06 Oct 2025 07:01 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3m2j24ab2wx2nhttps://bsky.app/profile/cryspen.com/post/3lz3yhxbwwc22Submissions for RWC 2026 are open now! Real World Crypto (RWC) is an annual event where cryptographers and security engineers can exchange ideas and results on the use of cryptography in mainstream applications. buff.ly/0PoLe2D https://rwc.iacr.org/2026/18 Sep 2025 09:02 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3lz3yhxbwwc22https://bsky.app/profile/cryspen.com/post/3lwnpvf3piw2eHow do we prove our cryptography is secure? 🧐 Join a talk by our Chief Researcher, Karthikeyan Bhargavan, on the rise of formally verified crypto! #cryptography #formalverification #cybersecurity #PQC #infosec https://buff.ly/k8Z7HGP18 Aug 2025 06:00 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3lwnpvf3piw2ehttps://bsky.app/profile/cryspen.com/post/3lw44lgm7yl2uJZLint 2.0 is here from MTG & Cryspen to lint post-quantum certificates! Now supporting ML-KEM & ML-DSA via libcrux. Read more detail on the blog: buff.ly/EviQFar #PQC #cryptography https://buff.ly/EviQFar11 Aug 2025 06:00 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3lw44lgm7yl2uhttps://bsky.app/profile/cryspen.com/post/3ltjadizxzb24We're proud to be recognized by Wavestone on their 2025 Radar of French Cybersecurity Startups. A significant milestone that validates our core mission: building the essential developer tools for creating high-assurance software. Making provably secure software accessible to all developers. https://www.wavestone.com/fr/insight/radar-des-startups-cybersecurite-francaises-2025/09 Jul 2025 06:56 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3ltjadizxzb24https://bsky.app/profile/cryspen.com/post/3lssikezhip2cCloudflare has launched Orange Me2eets, an open-source end-to-end encrypted video calling demo! Built on top of our OpenMLS implementation, this project showcases secure, private real-time communication. buff.ly/eEdJdnf #Cloudflare #E2EE #VideoCalling #OpenSource #OpenMLS https://blog.cloudflare.com/orange-me2eets-we-made-an-end-to-end-encrypted-video-calling-app-and-it-was/30 Jun 2025 05:52 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3lssikezhip2chttps://bsky.app/profile/cryspen.com/post/3lrroekvxw52sCryspen is excited to announce it has been awarded a grant from the Ethereum Foundation to extend our hax verification toolchain with support for the Lean prover. Watch this space for more on this soon! #FormalVerification #Lean #Rust17 Jun 2025 04:38 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3lrroekvxw52shttps://bsky.app/profile/cryspen.com/post/3lraybd36fy2cAt IEEE S&P, Théophile Wallez presented new results on the formal security verification of a bit-precise executable specification of TreeKEM, the core key agreement component of the MLS protocol. This work was done in collaboration with chief research scientist Karthikeyan Bhargavan. https://buff.ly/UZCmJyR10 Jun 2025 13:20 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3lraybd36fy2chttps://bsky.app/profile/cryspen.com/post/3lp4az23jvc2dThrilled to welcome Clément to Cryspen's Tools and Proofs team! 🎉 His expertise in formal methods (PhD from Inria Paris!) will be for conducting rigorous proofs and enhancing our tooling. Welcome, Clément! 🚀 #NewHire #FormalMethods buff.ly/Ab4wuNA https://cryspen.com/post/welcome_clement/14 May 2025 05:22 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3lp4az23jvc2dhttps://bsky.app/profile/cryspen.com/post/3loir4xrvza2iUpdates from some of Cryspen's Open Source Projects! Check out our latest updates: - Dive into the latest developments from the past month on 𝐡𝐚𝐱. buff.ly/trIZnTx - And see how the 𝐎𝐩𝐞𝐧𝐌𝐋𝐒 project is progressing and what's on the horizon. buff.ly/LAxrwnH https://hax.cryspen.com/blog/2025/05/05/this-month-in-hax-april-2025/06 May 2025 11:18 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3loir4xrvza2ihttps://bsky.app/profile/cryspen.com/post/3lm7btxsfw42bMLS Group State Forks: What, Why, How Group state forks are faulty states that MLS groups can end up in. We have a new blog post that looks at what they are exactly, how that happens and how to resolve them, and how a a new OpenMLS feature makes fork resolutions a little easier. https://buff.ly/Tu5xNm107 Apr 2025 06:00 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3lm7btxsfw42bhttps://bsky.app/profile/cryspen.com/post/3llv7xmhppy2bRust identifiers, demystified! We're revealing our analysis toolchain's secrets in our latest blog. Discover how we tackle global vs. local identifiers for better formal verification with hax. Read the full story: buff.ly/fWGDzLY #RustLang #CodeAnalysis #HighAssurance https://buff.ly/fWGDzLY03 Apr 2025 06:00 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3llv7xmhppy2bhttps://bsky.app/profile/cryspen.com/post/3llqoese3u22sUpdates from some of Cryspen's Open Source Projects! Check out our latest updates: - Dive into the latest developments from the past month on 𝐡𝐚𝐱. buff.ly/TJpxWW1 - And see how the 𝐎𝐩𝐞𝐧𝐌𝐋𝐒 project is progressing and what's on the horizon. buff.ly/VAJxltR https://buff.ly/TJpxWW101 Apr 2025 10:34 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3llqoese3u22shttps://bsky.app/profile/cryspen.com/post/3llee5k6dqv2iRWC 2025 buzzed with energy as the cutting edge of cryptography was presented to and discussed among an audience. Today, Cryspen teamed up with Google to showcase practical, scalable, verified solutions for high-assurance software and post-quantum cryptography. https://buff.ly/qc3lpn227 Mar 2025 12:59 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3llee5k6dqv2ihttps://bsky.app/profile/cryspen.com/post/3lldqc4n6xm2wNew blog post! 📝 Control flow analysis with Hax. In this post we show how to ensure control flow properties such as "function A is always called before function B" in Rust. Super relevant for security! 🔒 buff.ly/ntTW299 #rustlang #formalverification #security https://buff.ly/ntTW29927 Mar 2025 07:04 +0000at://did:plc:aijjn3envca7draesd656w6e/app.bsky.feed.post/3lldqc4n6xm2w