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- From: exudnw@exu.ericsson.se (Dave Williams)
- Newsgroups: alt.security
- Subject: Re: Tom Clancy, and whitenoise digital encr
- Message-ID: <1992Nov9.210442.2902@exu.ericsson.se>
- Date: 9 Nov 92 21:04:42 GMT
- References: <1992Nov6.175051.3401@lokkur.dexter.mi.us>
- Sender: news@exu.ericsson.se
- Reply-To: exudnw@exu.ericsson.se
- Organization: Ericsson Network Systems
- Lines: 32
- Nntp-Posting-Host: floyd.exu.ericsson.se
- X-Disclaimer: This article was posted by a user at Ericsson.
- Any opinions expressed are strictly those of the
- user and not necessarily those of Ericsson.
-
- In article 3401@lokkur.dexter.mi.us, scs@lokkur.dexter.mi.us (Steve Simmons) writes:
- >kdm1@Ra.MsState.Edu (Kenneth D. Mitchell) writes:
- >
- >>In the book _Sum of All Fears_ by Tom Clancy he mentions the CIA
- >>using a cd containing random noise to encrypt data, I know this
- >>is a good method to use, and I know Tom Clancy keeps his
- >>details accurate but I was wondering if the CIA really uses this method.
- >
- >Something like this was used in military stuff sometime in the 70s.
- >The general idea was to generate a series of pseudo-random bits. The
- >series would not "repeat" or become less random for several days, and
- >was restarted with a new key every day.
- >
- >The series would be broadcast continuously. Whenever a message was to
- >be sent, the bits of the message would be xored onto the random bits.
- >Recievers were in sync and generated the same sequence. They xored the
- >sequence recieved with the generated sequence. The message would
- >immediately appear.
- >
- >Advance apologies for inaccuracies; I heard this stuff over a lot of beer
- >in a Navy bar back in the 70s.
-
- Actually, it's a pretty good description of the wideband technology used
- in tactical air-air in the 70's and early 80's. All an intercept receiver
- would hear would be "white" noise. The main problem with this system was
- the bandwidth required to transmit the signal.
-
- ---
- = exudnw@exu.ericsson.se =
- = David Williams "You can't win, you can't break even, =
- = Ericsson Network Systems and you can't quit" =
- = Richardson, TX 75081 my opinions... =
-