Secret communication

Classification Context

Section:

ELECTRICITY

Class:

ELECTRIC COMMUNICATION TECHNIQUE

Subclass:

SECRET COMMUNICATION; JAMMING OF COMMUNICATION

Child Classifications

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• H04K 1/02 by adding a second signal to make the desired signal unintelligible
• H04K 1/04 by frequency scrambling, i.e. by transposing or inverting parts of the frequency band or by inverting the whole band
• H04K 1/06 by transmitting the information or elements thereof at unnatural speeds or in jumbled order or backwards
• H04K 1/08 by varying the polarisation of transmitted waves
• H04K 1/1 by using two signals transmitted simultaneously or successively