SECRET COMMUNICATION; JAMMING OF COMMUNICATION

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.