arrangements for secret or secure communications; Network security protocols

Child Classifications

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• H04L 9/001
• H04L 9/002
• H04L 9/006
• H04L 9/008
• H04L 9/06 the encryption apparatus using shift registers or memories for block-wise coding, e.g. DES systems
• H04L 9/08 Key distribution
• H04L 9/10 with particular housing, physical features or manual controls
• H04L 9/12 Transmitting and receiving encryption devices synchronised or initially set up in a particular manner
• H04L 9/14 using a plurality of keys or algorithms
• H04L 9/30 Public key, i.e. encryption algorithm being computationally infeasible to invert or user's encryption keys not requiring secrecy
• H04L 9/32 including means for verifying the identity or authority of a user of the system
• H04L 9/34 Bits, or blocks of bits, of the telegraphic message being interchanged in time
• H04L 9/36 with means for detecting characters not meant for transmission
• H04L 9/38 Encryption being effected by mechanical apparatus, e.g. rotating cams, switches, keytape punchers
• H04L 9/40 Network security protocols
• H04L 9/50