arrangements for secret or secure communications; Network security protocols

Child Classifications

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• H04L 9/001 CPC only CPC only
• H04L 9/002 +3 CPC CPC only CPC only
• H04L 9/006 +1 CPC CPC only CPC only
• H04L 9/008 CPC only CPC only
• H04L 9/06 the encryption apparatus using shift registers or memories for block-wise coding, e.g. DES systems since 1990 +3 CPC IPC+CPC Available in IPC and CPC
• H04L 9/08 Key distribution since 1990 +5 CPC IPC+CPC Available in IPC and CPC
• H04L 9/10 with particular housing, physical features or manual controls since 1990 IPC+CPC Available in IPC and CPC
• H04L 9/12 Transmitting and receiving encryption devices synchronised or initially set up in a particular manner since 1990 IPC+CPC Available in IPC and CPC
• H04L 9/14 using a plurality of keys or algorithms since 1990 IPC+CPC Available in IPC and CPC
• H04L 9/18 Encryption by serially and continuously modifying data stream elements, e.g. stream cipher systems since 1990 −1 IPC IPC only IPC only
• H04L 9/28 using particular encryption algorithm since 1990 IPC only IPC only
• H04L 9/30 Public key, i.e. encryption algorithm being computationally infeasible to invert or user's encryption keys not requiring secrecy since 1990 +4 CPC IPC+CPC Available in IPC and CPC
• H04L 9/32 including means for verifying the identity or authority of a user of the system since 1990 +10 CPC IPC+CPC Available in IPC and CPC
• H04L 9/34 Bits, or blocks of bits, of the telegraphic message being interchanged in time since 1990 IPC+CPC Available in IPC and CPC
• H04L 9/36 with means for detecting characters not meant for transmission since 1990 IPC+CPC Available in IPC and CPC
• H04L 9/38 Encryption being effected by mechanical apparatus, e.g. rotating cams, switches, keytape punchers since 1990 IPC+CPC Available in IPC and CPC
• H04L 9/40 Network security protocols since 2022 IPC+CPC Available in IPC and CPC
• H04L 9/50 CPC only CPC only