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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 2209/08 Randomization, e.g. dummy operations or using noise
  • 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 2209/50 Oblivious transfer
  • H04L 2209/56 Financial cryptography, e.g. electronic payment or e-cash
  • 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 2209/84 Vehicles

Top Applicants

Top 10 applicants by patent filingsfor class H04, 2013–2023, worldwide · Source: EPO PATSTAT

  1. HUAWEI TECHNOLOGIES COMPANY CN 101,476
  2. QUALCOMM US 101,139
  3. SAMSUNG ELECTRONICS COMPANY KR 96,655
  4. TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) SE 57,744
  5. LG ELECTRONICS KR 55,253
  6. HUAWEI TECHNOLOGIES COMPANY 54,181
  7. SONY CORPORATION JP 35,309
  8. ZTE CORPORATION CN 32,950
  9. INTEL CORPORATION US 27,533
  10. GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORPORATION CN 27,498