Secure communication system

BM-2cWx9duUQEkRXJjSMH1FCd2yAxfmiaRpGe
Dec 16 16:41

Secure communication system Patent number: 4188580 Abstract: A secure communication system for transmitting and receiving an encoded information signal. The system generates at transmitting and receiving locations a predetermined unique pseudorandom code. A synchronized tracking signal is imposed on the information to be transmitted and added to the information to form an intermediate signal. The pseudorandom code is then multiplied by the intermediate signal directly so that the ultimate result appears to assume the character of pseudorandom noise, which is then transmitted to the receiving location. The synchronization and transmitted encoded portion is decoded at the receiver and used to generate a base signal for a pseudorandom generator at the receiving location, as well as initiate initial clocking pulse time for operation of the receiver pseudorandom generator. Type: Grant Filed: October 20, 1977 Date of Patent: February 12, 1980 Assignee: Telesync Corporation Inventors: Carl R. Nicolai, William M. Raike, David L. Miller The Puzzle Palace: A Report on America's Most Secret Agency James Bamford, Penguin Books, 1983. [A] foursome of inventors in Seattle, working in their spare time in the back of a garage, managed to develop a new type of voice scrambler. Led by thirty-five-year-old Carl Nicolai, a job-shopper, or technical "Kelly girl," the group called its new invention the Phasorphone and submitted a patent application in October 1977. In April 1978, Nicolai finally received a response from the Patent Office. But when he opened the letter, he was stunned Instead of a patent, his hands held a strange form with the words SECRECY ORDER in large bold letters across the top. Nicolai had suddenly been assaulted with one of the oldest weapons in the nation's national security arsenal: the Invention Secrecy Act. [...] Nicolai's secrecy order told him little except that he faced two years in jail and a $10,000 fine for disclosing any aspect of his device "in any way to any person not cognizant of the invention prior to the date of the order." Nowhere on the order did it say why it was issued or who ordered the action. [...] The object of Nicolai's patent application and the NSA's anxiety was a voice privacy system that relied more, apparently, on the science of transmission security than cryptography. As opposed to cryptography, which merely renders the contents of a message unintelligible to those without the key, transmission security conceals the very existence of the message itself. The seed for the Phasorphone was planted in 1960 in an article on communications security by Alfred Pfanstiehl for Analog magazine. Pfanstiehl suggested that instead of the traditional method of transmission, where signals are sent between transmitter and receiver over a single frequency, a system of pseudorandom wave forms be used. Under such a system a code could be devised using pseudorandom alterations of the frequency spectrum exactly synchronized between transmitter and receiver. The system held promise for an area particularly vulnerable to eavesdropping: CB and marine band radio. But it could also be modified for telephone.

[chan] general
Dec 16 17:18

> transmission security conceals the very existence of the message itself. This is what most scares the control freaks

[chan3] general
Dec 16 17:21

This is why is so much fuss about cryptography and so little focus on steganography

[chan] general
Dec 16 18:52

Steganography broadcast on bitmessage BM-NBWiFu2WcQwRSPvXygAhTrg3de9Ahte6

[chan] general
Dec 16 18:52

Are you into steganography? I would like to learn more from someone proficient.

[chan] general
Dec 16 19:35

Isn't this just CDMA?

[chan] general
BM-2cW67GEKkHGonXKZLCzouLLxnLym3azS8r

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