{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9721120","patent":{"patent_number":"US-9721120","title":"Preventing unauthorized calls to a protected function","assignee":null,"inventors":[],"filing_date":"2013-05-14T00:00:00.000Z","publication_date":"2017-08-01T00:00:00.000Z","cpc_codes":["G06F","G06F"],"num_claims":25,"abstract":"An obfuscated program can be configured to resist attacks in which an attacker directly calls a non-entry function by verifying that an execution path to the function is an authorized execution path. To detect an unauthorized execution order, a secret value is embedded in each function along an authorized execution path. At runtime, the secrets are combined to generate a runtime representation of the execution path, and the runtime representation is verified against an expected value. To perform the verification, a verification polynomial is evaluated using the runtime representation as input. A verification value result of zero means the execution path is an authorized execution path."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Preventing unauthorized calls to a protected function","description":"An obfuscated program can be configured to resist attacks in which an attacker directly calls a non-entry function by verifying that an execution path to the function is an authorized execution path. ","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9721120","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-9721120","citation_suggestion":"Patentable. \"Preventing unauthorized calls to a protected function\" (US-9721120). https://patentable.app/patents/US-9721120","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9721120","json":"https://patentable.app/api/llm-context/US-9721120","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T09:33:13.413Z"}