SECRET COMMUNICATION; JAMMING OF COMMUNICATION

Introduced: September 1968

Description

H04K covers technologies for concealing communication content and deliberately disrupting electromagnetic signals. This includes encryption methods, steganography, spread spectrum techniques, and frequency hopping systems designed to prevent unauthorized signal interception or eavesdropping. The class also encompasses jamming devices and countermeasures that intentionally interfere with wireless or wired transmissions to deny communication access. Applications range from military and government secure communications to commercial privacy protection and anti-theft systems.

Of 3 combined children, 2 exist in both systems.

1 codes are CPC-only extensions.

Note: 1 CPC extensions are marked as secondary classification only.

Child Classifications

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H04K 1/00 Secret communication +2 CPC IPC+CPC Available in IPC and CPC
H04K 2203/00 Jamming of communication; Countermeasures 2nd only +2 CPC CPC only CPC only
H04K 3/00 Jamming of communication; Counter-measures +4 CPC IPC+CPC Available in IPC and CPC