{"schema_version":"onlylabs.public_signal.v1","title":"Anthropic Writing: Discovering Cryptographic Weaknesses","description":"Anthropic writing signal with public source context, captured evidence pages, related signals, and data-business radar classification.","url":"https://onlylabs.fyi/signals/1a03dbe4-4495-41eb-8a9e-26a15dbda2ac","json_url":"https://onlylabs.fyi/signals/1a03dbe4-4495-41eb-8a9e-26a15dbda2ac/signal.json","generated_at":"2026-07-28T23:53:28.927Z","evidence_latest_fetched_at":"2026-07-28T20:03:16.45+00:00","signal_first_seen_at":"2026-07-28T20:01:41.593607+00:00","org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab","category_label":"Frontier lab","dossier_url":"https://onlylabs.fyi/labs/anthropic","dossier_json_url":"https://onlylabs.fyi/labs/anthropic/dossier.json"},"related_urls":{"signal":"https://onlylabs.fyi/signals/1a03dbe4-4495-41eb-8a9e-26a15dbda2ac","signal_json":"https://onlylabs.fyi/signals/1a03dbe4-4495-41eb-8a9e-26a15dbda2ac/signal.json","source":"https://www.anthropic.com/research/discovering-cryptographic-weaknesses","lab_dossier":"https://onlylabs.fyi/labs/anthropic","lab_dossier_json":"https://onlylabs.fyi/labs/anthropic/dossier.json","analysis":"https://onlylabs.fyi/analysis/anthropic","analysis_json":"https://onlylabs.fyi/analysis/anthropic/analysis.json","analysis_evidence_json":"https://onlylabs.fyi/analysis/anthropic/evidence.json","category":"https://onlylabs.fyi/frontier","category_json":"https://onlylabs.fyi/frontier.json","category_feed":"https://onlylabs.fyi/frontier/feed.xml","category_signals_json":"https://onlylabs.fyi/signals.json","topic":"https://onlylabs.fyi/topics/talking","topic_signals_json":"https://onlylabs.fyi/topics/talking/signals.json","topic_feed":"https://onlylabs.fyi/topics/talking/feed.xml","data_business":null},"answer_pack":{"answer":"Anthropic published Discovering Cryptographic Weaknesses. 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The first attack significantly weakens HAWK, a digital signature scheme that was built for a post-quantum world. The second identifies a new way to attack round-reduced AES, the most widely used symmetric cipher. These are substantial research advances, but they do not currently affect any production systems. This post describes both findings in more detail and discusses the implications for cryptography in an age of powerful AI models. Introduction When we launched Claude Mythos Preview, we showed it was able to autonomously find and exploit vulnerabilities in almost every piece of software we pointed it at. This included several major cryptographic libraries—shared collections of code that are used to encrypt data. The vulnerabilities that Claude found in these cryptographic libraries 1 were due to incorrect implementation of the algorithms—that is, errors..."},"evidence_pages":[{"is_primary":false,"source_match":false,"url":"https://anthropic.com/document/aes_mobius_bridge_cot.pdf","final_url":"https://www-cdn.anthropic.com/5273e714527440f1c8b7c7bf5756d4ac22ae8995/aes_mobius_bridge_cot.pdf","title":"Discovering Cryptographic Weaknesses","http_status":200,"content_type":"application/pdf","capture_method":"firecrawl","fetched_at":"2026-07-28T20:03:16.45+00:00","bytes":1820334,"raw_path":"ad68b651ef324311e0234fee795c3cb793e03ef66c9ee20bd4169a1efe9e31a3.pdf","content_hash":"b89b6be5bff5ed2e469e33a8f6b75eb12331da27296f2dddf10b2c54419e0c15","excerpt_chars":1200,"truncated":true,"excerpt":"Mythos Preview’s Chain of Thought in Discovering the AES Möbius Bridge Abstract This document contains Mythos Preview’s chain of thought in the rollout where it discovered the Möbius Bridge idea that ultimately lead to its improved cryptanalytic attack on 7 rounds of AES. There were many others that followed and refined the idea, proposed other extensions, and validated the results were correct; but this one shows the origin of the Möbius Bridge. This document is a rewrite of the original discovery process edited (by Mythos Preview) for clarity. The editing process was designed to improve the clarity of the process for a reader: the original transcript includes the agent’s process—thinking, writing code, running the code—along with the any program output. The rewrite preserves one-for-one every action that Claude took throughout the process, but summarizes the programs executed and outputs observed. With the exception of this abstract, no text in this document was edited by a human. The full technical paper that resulted from the discovery of the Möbius Bridge can be found at the following URL: https://anthropic.com/document/aes_mobius_bridge.pdf Anthropic 28 July 2026 --- 1..."},{"is_primary":false,"source_match":false,"url":"https://anthropic.com/document/aes_mobius_bridge.pdf","final_url":"https://www-cdn.anthropic.com/c88771e1bf5ee8885349eed05e5484c0e5f7e02b/aes_mobius_bridge.pdf","title":"Discovering Cryptographic Weaknesses","http_status":200,"content_type":"application/pdf","capture_method":"firecrawl","fetched_at":"2026-07-28T20:03:16.293+00:00","bytes":1084840,"raw_path":"28a7b7ff7cd77bb0282c93e0273fd0bdc3d83f1ee9664ac759ad6ca6c07da4d0.pdf","content_hash":"0857732bb46795de3d14a9df403a5537b4f06c0bf924e0dcb7d9f23ec22cf7ad","excerpt_chars":1200,"truncated":true,"excerpt":"Cryptanalysis of 7-Round AES via the Algebraic Structure of its S-box Milad Nasr and Nicholas Carlini Anthropic \\*\\*Abstract.\\* _The AES S-Box is not a random permutation; we show that its algebraic_ _structure allows for improved attacks on 7 rounds in the single-key setting. We focus_ _105 99_ _our efforts on extending a2 chosen plaintext and2-time algorithm designed by_ _Derbez, Fouque, and Jean \\[DFJ13\\]. Our core contribution is an algebraic_ Möbius\\* _bridge_ that exploits the invert-then-affine-transform structure of the AES S-box to eliminate one of the nine guessed key bytes required by \\[DFJ13\\]. This immediately leads to a factor-of-256 reduction in the number of key guesses required. But calculating the necessary Möbius Transform is not free, and the work required to perform the naïve calculation cancels the savings. We therefore present several improvements that reduce the time required to calculate this transform; depending on 89.3 the exact methods used for accounting, we reduce the attack’s runtime to between2 91.4 and2, at the same data complexity. This paper presents these improvements along with the computational techniques we used to help us empirically gain..."},{"is_primary":false,"source_match":false,"url":"https://csrc.nist.gov/csrc/media/Projects/pqc-dig-sig/documents/round-1/spec-files/hawk-spec-web.pdf","final_url":"https://csrc.nist.gov/csrc/media/Projects/pqc-dig-sig/documents/round-1/spec-files/hawk-spec-web.pdf","title":"Discovering Cryptographic Weaknesses","http_status":200,"content_type":"application/pdf","capture_method":"firecrawl","fetched_at":"2026-07-28T20:03:15.324+00:00","bytes":1024741,"raw_path":"b950763cd2464c3971518fbdccd44bc6928f518b74573109239fc2f5d9164d8c.pdf","content_hash":"e520eb2bf9a85d0f62a90fe92def4e26cf10336f41ce746eb68ce35f000fd47c","excerpt_chars":1200,"truncated":true,"excerpt":"HAWK version 1.0 (June 1, 2023) [https://hawk-sign.info](https://hawk-sign.info/) Joppe W. Bos1, Olivier Bronchain1, Léo Ducas 2,3 , Serge Fehr 2,3 , Yu-Hsuan Huang2, Thomas Pornin4, Eamonn W. Postlethwaite2, Thomas Prest5, Ludo N. Pulles2, Wessel van Woerden6 1 NXP Semiconductors, 2 Centrum Wiskunde & Informatica, 3 Mathematical Institute, Leiden University, 4 NCC Group, 5 PQShield, 6 Institut de Mathématiques de Bordeaux. * * * 1 Introduction HAWK is a signature scheme inspired by the introduction of the lattice isomorphism problem (LIP) to signatures \\[DvW22\\], and this specification document is based on the article that first described a practical variant \\[DPPvW22b\\]. The move from the framework of \\[DvW22\\] towards a practical variant in \\[DPPvW22b\\] is achieved by introducing module structure and using simpler sampling procedures to create signatures. The HAWK signature scheme specified in this document introduces further simplifications and optimisations compared to the signature scheme introduced in \\[DPPvW22b\\], which we will refer to as HAWK-AC22. In particular, the distribution used to sample private keys in HAWK is simplified compared to that in HAWK-AC22. The..."},{"is_primary":false,"source_match":false,"url":"https://anthropic.com/document/hawk_key_recovery.pdf","final_url":"https://www-cdn.anthropic.com/e8d50c167ad47beeb03d6109a4a484be95cb38ea/hawk_key_recovery.pdf","title":"Discovering Cryptographic Weaknesses","http_status":200,"content_type":"application/pdf","capture_method":"firecrawl","fetched_at":"2026-07-28T20:03:12.581+00:00","bytes":748154,"raw_path":"0f80139a700ea5601249d2fb634c0b41a979176a2c94289b8e7f8b2cab2650f9.pdf","content_hash":"056faead316ea9a8eb01000cb9c548e79e21ad09a0684c3d52bbc1093183ac89","excerpt_chars":1200,"truncated":true,"excerpt":"HAWK-nKey Recovery Reduces to SVP in Dimensionn/2 + 1 Zygimantas Straznickas and Stephen A. Weis Anthropic {zygi,sweis}@anthropic.com Abstract. HAWK is a lattice signature scheme that is currently a thirdround candidate in NIST’s post-quantum signature competition. We give an unconditional, deterministic polynomial-time reduction from HAWK- _n_ key recovery over _Kn_ = Q( _ζ₂ℓ_)to poly( _n_)calls to an exact Shortest ℓ−1 Vector Problem (SVP) oracle in dimension \\*n/\\*2 + 1, where _n_ = 2 is the ring degree. The reduction uses a nontrivial automorphism of the key lattice, supplied by the Galois involution _τ_ : _ζ7→−ζ_ and recoverable as a shortest vector of a public rank-n lattice isometric, up to scaling, _√_ _n_/2+1 n/2−1 to Z _⊕_ 2Z. Ducas’s block reduction \\[Duc23;BN24\\] on this near-hypercubic class finds the automorphism, and the descent of van Gent and Pulles \\[GP25\\] recovers the key from it. In the gate-count model of \\[AGPS20\\], the attack lowers the key-recovery cost of HAWK-512 from 150 108 288 182 2 to2 and of HAWK-1024 from2 to2. We demonstrate this with a practical implementation that recovers a HAWK-256 secret key end-to-end in a few hours on a single server. 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