{"data":{"id":"661a3f5a-d64e-4e40-80e6-2963012f72e3","title":"SemField: A Simple, Linear, Continuous, yet Robust Semantic Watermark","summary":"SemField is a training-free semantic watermark that embeds a continuous, linear signal into the sentence embedding space, using a shared secret key to define a Gaussian direction. SemField-PL, a polarity-locked variant, fixes the orientation from the initial sentence and reinforces it during generation. Across clean detection and four paraphrasing attacks, both variants reach a mean True Positive Rate of 88.2% to 90.4% at a 1% False Positive Rate, across three models and against 12 baselines.","solution":"N/A -- no mitigation discussed in source.","labels":["security","research"],"sourceUrl":"https://arxiv.org/abs/2610.11848v1","publishedAt":"2026-10-08T12:35:11.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":[],"issueType":"research","affectedPackages":null,"affectedPackageNames":null,"affectedPackageRefs":null,"affectedVendors":[],"affectedVendorsRaw":["LLMs"],"classifierModel":"claude-haiku-5-5","classifierPromptVersion":"v4","summaryPromptVersion":"v2","headline":null,"headlinePromptVersion":null,"cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":null,"epssScore":null,"epssCheckedAt":null,"kevDateAdded":null,"advisoryAliases":null,"affectedPackagesSource":null,"affectedPackagesCheckedAt":null,"patchAvailable":null,"disclosureDate":"2026-10-08T12:35:11.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":null,"aiComponentTargeted":"model","llmSpecific":true,"classifierConfidence":0.9,"researchCategory":"preprint","atlasIds":null}}