Patent classifications
H
ELECTRICITY
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H04
ELECTRIC COMMUNICATION TECHNIQUE
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H04L
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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9/00
Cryptographic mechanisms or cryptographic; arrangements for secret or secure communications; Network security protocols
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H04L9/006
involving public key infrastructure [PKI] trust models
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H04L9/007
involving hierarchical structures
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