{"id":55669,"date":"2024-03-22T18:00:49","date_gmt":"2024-03-22T18:00:49","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/35687\/GoFetch-Breaking-Constant-Time-Cryptographic-Implementations-Using-Data-Memory-Dependent-Prefetchers.html"},"modified":"2024-03-22T18:00:49","modified_gmt":"2024-03-22T18:00:49","slug":"gofetch-breaking-constant-time-cryptographic-implementations-using-data-memory-dependent-prefetchers","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/gofetch-breaking-constant-time-cryptographic-implementations-using-data-memory-dependent-prefetchers\/","title":{"rendered":"GoFetch &#8211; Breaking Constant-Time Cryptographic Implementations Using Data Memory-Dependent Prefetchers"},"content":{"rendered":"<div><img decoding=\"async\" src=\"https:\/\/gofetch.fail\/img\/gofetch_1000.jpg\" class=\"ff-og-image-inserted\"><\/div>\n<p> The GoFetch attack is based on a CPU feature called data memory-dependent prefetcher (DMP), which is present in the latest Apple processors. We reverse-engineered DMPs on Apple m-series CPUs and found that the DMP activates (and attempts to dereference) data loaded from memory that &#8220;looks like&#8221; a pointer. This explicitly violates a requirement of the constant-time programming paradigm, which forbids mixing data and memory access patterns. <\/p>\n<p> To exploit the DMP, we craft chosen inputs to cryptographic operations, in a way where pointer-like values only appear if we have correctly guessed some bits of the secret key. We verify these guesses by monitoring whether the DMP performs a dereference through cache-timing analysis. Once we make a correct guess, we proceed to guess the next batch of key bits. Using this approach, we show end-to-end key extraction attacks on popular constant-time implementations of classical (OpenSSL Diffie-Hellman Key Exchange, Go RSA decryption) and post-quantum cryptography (CRYSTALS-Kyber and CRYSTALS-Dilithium). <\/p>\n<p> READ MORE <a href=\"https:\/\/packetstormsecurity.com\/news\/view\/35687\/GoFetch-Breaking-Constant-Time-Cryptographic-Implementations-Using-Data-Memory-Dependent-Prefetchers.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":55670,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[60],"tags":[10890],"class_list":["post-55669","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-packet-storm","tag-headlinedata-lossflawapplecryptography"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - 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