{"data":{"id":"a52e04eb-9709-4d22-a126-58a872c046a6","title":"Enhancing the Security of Large Character Set CAPTCHAs Using Transferable Adversarial Examples","summary":"Researchers propose ACG (Adversarial Large Character Set CAPTCHA Generation), a framework for defending large character set CAPTCHAs against automated attacks. It pairs a Fine-grained Generation Module with an Ensemble Generation Module that adds global perturbations, and they release Adv-Eval, a toolkit with datasets from 10 popular Chinese CAPTCHA schemes. Experiments show the average success rate of diverse attacks falls from 51.52% to 2.56%.","solution":"N/A -- no mitigation discussed in source.","labels":["research","security"],"sourceUrl":"http://ieeexplore.ieee.org/document/11288041","publishedAt":"2025-12-09T13:16:44.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":["model_evasion"],"issueType":"research","affectedPackages":null,"affectedPackageNames":null,"affectedPackageRefs":null,"affectedVendors":[],"affectedVendorsRaw":[],"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":"2025-12-09T13:16:44.000Z","fixReleasedAt":null,"daysToFix":null,"fixCheckedAt":null,"capecIds":null,"crossRefCount":0,"attackSophistication":"advanced","impactType":["integrity"],"aiComponentTargeted":"model","llmSpecific":false,"classifierConfidence":0.85,"researchCategory":"peer_reviewed","atlasIds":null}}