{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-11256478","patent":{"patent_number":"US-11256478","title":"Method for securing a cryptographic process with SBOX against high-order side-channel attacks","assignee":null,"inventors":[],"filing_date":"2018-06-28T00:00:00.000Z","publication_date":"2022-02-22T00:00:00.000Z","cpc_codes":["G06F","G06F","H04L","H04L","H04L","H04L","G06F","H04L","H04L"],"num_claims":18,"abstract":"The present invention relates to a method for securing against N-order side-channel attacks a cryptographic process using in a plurality of encryption rounds an initial Substitution box S0 comprising the steps of: —generating (E12) a first randomized substitution box S1 by masking said initial substitution box S0 such that S1(x XOR m1)=S0(x) XOR m2, with m1, m2 uniformly-distributed random values, for any input value x of the initial substitution box S0, —generating (E13) a first transrandomized Substitution box S(1,1) from the first randomized substitution box S1 and from masks m1,1, m′1,1 such that S(1, 1)[x]=S1[x xor (m1 xor m1,1)] xor (m2 xor m′1,1) for any input value x of the first transrandomized Substitution box S(1,1), —generating (E14) from the first transrandomized Substitution box S(1,1) a N−1th transrandomized Substitution box S(1, N−1) by performing iteratively N−2 times a step of generation of a ith transrandomized Substitution box S(1, i) from a i−1th transrandomized substitution box S(1, i−1) and from a plurality of masks m 1,i, m′1,i, m1,i−1, m′1,i−1 such that S(1, i)[x]=S(1, i−1)[x xor (m1,i-1 xor m1,i)] xor (m′1,i−1 xor m′1,i) for any input value x of the ith transrandomized substitution box S(1, i), with i an integer comprised in {2, . . . N−1}, —performing the cryptographic process using (E15) the N−1th transrandomized Substitution box S(1, N−1) instead of the initial Substitution box S0 in at least said first round of the cryptographic process."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Method for securing a cryptographic process with SBOX against high-order side-channel attacks","description":"The present invention relates to a method for securing against N-order side-channel attacks a cryptographic process using in a plurality of encryption rounds an initial Substitution box S0 comprising ","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-11256478","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-11256478","citation_suggestion":"Patentable. \"Method for securing a cryptographic process with SBOX against high-order side-channel attacks\" (US-11256478). https://patentable.app/patents/US-11256478","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-11256478","json":"https://patentable.app/api/llm-context/US-11256478","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-31T05:56:55.808Z"}