{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9819487","patent":{"patent_number":"US-9819487","title":"Re-encryption key generator, re-encryption device, encryption device, decryption device, and program","assignee":null,"inventors":[],"filing_date":"2015-02-06T00:00:00.000Z","publication_date":"2017-11-14T00:00:00.000Z","cpc_codes":["H04L","H04L","H04L","H04L","H04L","H04L"],"num_claims":9,"abstract":"A re-encryption key generator according to an embodiment generates a re-encryption key to obtain re-encrypted data that can be decrypted by a second private key of a second user device by re-encrypting ciphertext obtained by encrypting plaintext by a first public key of a first user device without decryption. The re-encryption key generator stores a first private key corresponding to the first public key. The re-encryption key generator stores a second re-encryption key generation key of the second user device that is different from a second public key corresponding to the second private key. The re-encryption key generator generates the re-encryption key based on the first private key and the second re-encryption key generation key."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Re-encryption key generator, re-encryption device, encryption device, decryption device, and program","description":"A re-encryption key generator according to an embodiment generates a re-encryption key to obtain re-encrypted data that can be decrypted by a second private key of a second user device by re-encryptin","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9819487","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-9819487","citation_suggestion":"Patentable. \"Re-encryption key generator, re-encryption device, encryption device, decryption device, and program\" (US-9819487). https://patentable.app/patents/US-9819487","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9819487","json":"https://patentable.app/api/llm-context/US-9819487","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T06:58:48.200Z"}