{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-10521984","patent":{"patent_number":"US-10521984","title":"Challenge-response badge","assignee":null,"inventors":[],"filing_date":"2015-03-31T00:00:00.000Z","publication_date":"2019-12-31T00:00:00.000Z","cpc_codes":["G07C","H04L","G07C","G07C","H04L","H04L","G07C","G07C","G07C","G07C","G07C","G07C"],"num_claims":15,"abstract":"Techniques described and suggested in the present document include access-card systems and methods that are resistant to attack. In certain implementations, a card reader transmits a challenge message to an access card. When the access card receives the challenge message, the access card validates the challenge message, and then generates a response message based at least in part on the information contained in the challenge message. A security server validates the response message, and when the security server determines that the response is secure, valid, and from an authorized access card, the security server grants access to a physical space. In some implementations, the challenge and response messages are digitally signed using a cryptographic key. Additional implementations include various tests that, when performed on the challenge and/or response messages detect and defeat many attempts to compromise the access-card system."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Challenge-response badge","description":"Techniques described and suggested in the present document include access-card systems and methods that are resistant to attack. In certain implementations, a card reader transmits a challenge message","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-10521984","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-10521984","citation_suggestion":"Patentable. \"Challenge-response badge\" (US-10521984). https://patentable.app/patents/US-10521984","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-10521984","json":"https://patentable.app/api/llm-context/US-10521984","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-30T11:18:38.699Z"}