H04K

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Description

SECRET COMMUNICATION; JAMMING OF COMMUNICATION

Subclasses

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Subclass Title
1/00 Secret communication (ciphering or deciphering apparatus per se G09C ; systems with reduced bandwidth or suppressed carrier H04B 1/66 ; spread spectrum techniques H04B 1/69 ; by using a sub-carrier H04B 14/08 ; by multiplexing H04J ; transmission systems for secret digital information H04L 9/00 ; secret or subscription television systems H04N 7/16, H04N 21/00 )
1/02 Secret communication (ciphering or deciphering apparatus per se G09C ; systems with reduced bandwidth or suppressed carrier H04B 1/66 ; spread spectrum techniques H04B 1/69 ; by using a sub-carrier H04B 14/08 ; by multiplexing H04J ; transmission systems for secret digital information H04L 9/00 ; secret or subscription television systems H04N 7/16, H04N 21/00 ) by adding a second signal to make the desired signal unintelligible
1/04 Secret communication (ciphering or deciphering apparatus per se G09C ; systems with reduced bandwidth or suppressed carrier H04B 1/66 ; spread spectrum techniques H04B 1/69 ; by using a sub-carrier H04B 14/08 ; by multiplexing H04J ; transmission systems for secret digital information H04L 9/00 ; secret or subscription television systems H04N 7/16, H04N 21/00 ) by frequency scrambling, i.e. by transposing or inverting parts of the frequency band or by inverting the whole band
1/06 Secret communication (ciphering or deciphering apparatus per se G09C ; systems with reduced bandwidth or suppressed carrier H04B 1/66 ; spread spectrum techniques H04B 1/69 ; by using a sub-carrier H04B 14/08 ; by multiplexing H04J ; transmission systems for secret digital information H04L 9/00 ; secret or subscription television systems H04N 7/16, H04N 21/00 ) by transmitting the information or elements thereof at unnatural speeds or in jumbled order or backwards
1/08 Secret communication (ciphering or deciphering apparatus per se G09C ; systems with reduced bandwidth or suppressed carrier H04B 1/66 ; spread spectrum techniques H04B 1/69 ; by using a sub-carrier H04B 14/08 ; by multiplexing H04J ; transmission systems for secret digital information H04L 9/00 ; secret or subscription television systems H04N 7/16, H04N 21/00 ) by varying the polarisation of transmitted waves

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Recent Patents

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Recent Publications

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Publication #TitleFiling DatePub DatePatent Owner
2020/0014,485 FIBER OPTIC LIGHT INTENSITY ENCRYPTION Sep 18, 19 Jan 09, 20 , Not available

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Patents Issued To Date - By Filing Year

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