CPC Main Group Additional Only
H04L 2209/00 Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
21 direct subcodes
Child Classifications
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- H04L 2209/04 Masking or blinding
- H04L 2209/08 Randomization, e.g. dummy operations or using noise
- H04L 2209/12 Details relating to cryptographic hardware or logic circuitry
- H04L 2209/16 Obfuscation or hiding, e.g. involving white box
- H04L 2209/20 Manipulating the length of blocks of bits, e.g. padding or block truncation
- H04L 2209/24 Key scheduling, i.e. generating round keys or sub-keys for block encryption
- H04L 2209/26 Testing cryptographic entity, e.g. testing integrity of encryption key or encryption algorithm
- H04L 2209/30 Compression, e.g. Merkle-Damgard construction
- H04L 2209/34 Encoding or coding, e.g. Huffman coding or error correction
- H04L 2209/42 Anonymization, e.g. involving pseudonyms
- H04L 2209/46 Secure multiparty computation, e.g. millionaire problem
- H04L 2209/50 Oblivious transfer
- H04L 2209/56 Financial cryptography, e.g. electronic payment or e-cash
- H04L 2209/60 Digital content management, e.g. content distribution
- H04L 2209/64 Self-signed certificates
- H04L 2209/68 Special signature format, e.g. XML format
- H04L 2209/72 Signcrypting, i.e. digital signing and encrypting simultaneously
- H04L 2209/76 Proxy, i.e. using intermediary entity to perform cryptographic operations
- H04L 2209/80 Wireless
- H04L 2209/84 Vehicles
Top Applicants
Top 10 applicants by patent filingsfor class H04, 2013–2023, worldwide · Source: EPO PATSTAT
- HUAWEI TECHNOLOGIES COMPANY CN 101,476
- QUALCOMM US 101,139
- SAMSUNG ELECTRONICS COMPANY KR 96,655
- TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) SE 57,744
- LG ELECTRONICS KR 55,253
- HUAWEI TECHNOLOGIES COMPANY 54,181
- SONY CORPORATION JP 35,309
- ZTE CORPORATION CN 32,950
- INTEL CORPORATION US 27,533
- GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORPORATION CN 27,498