{"data":{"id":"7c574251-27d1-47c3-b2ec-9f7be2226506","title":"Differential Fault Attacks on TFHE-Friendly Cipher FRAST","summary":"Researchers discovered that FRAST, a cipher designed to work efficiently with TFHE (Torus-based Fully Homomorphic Encryption, a method for computing on encrypted data), is vulnerable to differential fault attacks (DFAs, where attackers deliberately introduce errors into a system to extract secret keys). The attack can recover the encryption key in seconds using just a few faults, making it the first successful fault-based attack against this cipher.","solution":"The source recommends two countermeasures: 'removing the negacyclic restriction in the penultimate round of FRAST and introducing non-zero linear structures into the S-boxes (substitution boxes, which scramble data) of the last two rounds.' The source notes that standard linear structures cannot be added to negacyclic S-boxes without breaking their efficiency in TFHE.","labels":["security","research"],"sourceUrl":"http://ieeexplore.ieee.org/document/11659578","publishedAt":"2026-08-19T13:16:12.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":[],"issueType":"research","affectedPackages":null,"affectedVendors":[],"affectedVendorsRaw":[],"classifierModel":"claude-haiku-4-5-20251001","classifierPromptVersion":"v3","cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":null,"epssScore":null,"patchAvailable":null,"disclosureDate":"2026-08-19T13:16:12.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"advanced","impactType":["confidentiality","integrity"],"aiComponentTargeted":"framework","llmSpecific":false,"classifierConfidence":0.75,"researchCategory":"peer_reviewed","atlasIds":null}}