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- Path: sparky!uunet!pipex!warwick!nott-cs!ucl-cs!news
- From: J.Crowcroft@cs.ucl.ac.uk (Jon Crowcroft)
- Newsgroups: comp.dcom.cell-relay
- Subject: Covert Signalling in ATM Networks
- Message-ID: <3185@ucl-cs.uucp>
- Date: 5 Nov 92 12:42:24 GMT
- Sender: news@cs.ucl.ac.uk
- Lines: 33
-
-
- a classic form ovf covert signalling is emptiomised by the urban
- folklore concerning the football (soccer) fan who emigrated
- to australia, and had her relatives telephone the results daily, by a
- sequence of phone calls at a pre-arranged time, which she would
- not pick up, rather they would ring off after the count reached the
- score...
-
- the possibilities for this ina variabl;e bandwidth pre-arranged
- signalling VCI are endless, but the following scenario seemed more
- likely:
-
- say two parties wish to communicate through an atm net - they both
- open an account, and take it in turn to withdraw and deposit
- amounts of money, while the other party gets a statment - the balnace
- i nbthe acccount ould be a the goedelized number representing the
- morse value for the ascii text they wish to communicate (mime users
- would have to use uuencode first)...
-
- the defense the ATM swift-one consortium might employ would be to
- randomise the interest chareged and awarded daily, to make the number
- vary (albeit close to the original product of powers of primes, and
- therefore guessable, but tricky, needing at least all the computing
- resources of the cia).
-
- of course , some messages would have goedel number representations
- that would exhaust the imagination or gambling capabilities even of
- the chancellor of the rmajesty's government
-
- just a thought
- jon
- -------------
- p.s. i know its the wrong kind of atm:-)
-