{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8515060","patent":{"patent_number":"US-8515060","title":"Encryption apparatus, decryption apparatus, encryption method, decryption method, security method, program, and recording medium","assignee":null,"inventors":[],"filing_date":"2010-04-23T00:00:00.000Z","publication_date":"2013-08-20T00:00:00.000Z","cpc_codes":["H04L","H04L"],"num_claims":33,"abstract":"Security against CCA is improved without providing space for just improving the security against CCA in a ciphertext space. In encryption processing, a first ciphertext C1 is calculated from a plaintext M and a symmetric key K; a value containing a value corresponding to the symmetric key K and a value corresponding to the first ciphertext C1 is put into a collision-resistant function H to calculate a function value of the function H; and r corresponding to the function value is used to calculate second ciphertext C2=r·(Σμ=1nvμ·bμ)+ρ·bn+1∈G1n+1. In decryption processing, the second ciphertext C2∈G1n+1 and key information D1*=α·(Σμ=1nwμ·bμ*)+bn+1*∈G2n+1 are put into a bilinear function e to calculate a function value S˜=e(C2, D1*)∈GT; a value corresponding to the function value S˜ and the first ciphertext C1 are put into the collision-resistant function H to calculate a function value of the function H; and it is judged whether r˜ corresponding to the function value satisfies C2=r˜·(Σμ=1nvμ·bμ)+ρ˜·bn+1∈G1n+1."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Encryption apparatus, decryption apparatus, encryption method, decryption method, security method, program, and recording medium","description":"Security against CCA is improved without providing space for just improving the security against CCA in a ciphertext space. In encryption processing, a first ciphertext C1 is calculated from a plainte","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8515060","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-8515060","citation_suggestion":"Patentable. \"Encryption apparatus, decryption apparatus, encryption method, decryption method, security method, program, and recording medium\" (US-8515060). https://patentable.app/patents/US-8515060","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8515060","json":"https://patentable.app/api/llm-context/US-8515060","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-31T01:59:11.009Z"}