The Virtual Bookcase Reviews of 'For the Sake of Elena':
Reviewer Rob Slade wrote:
Elizabeth George writes very good mystery novels. I hesitate to use the
phrase, "in the great British mystery tradition," since she has extended the
genre by a population of very real characters and studies, in depth, of human
motivations.
So where is the technology and/or science fiction? The plot in this particular
book partly hangs on a call made via "Ceephone". This is the British version
of the American TDD (Telecommunications Device for the Deaf). Part of the
story looks at whether the call was made at all, part hangs on whether such a
call could be spoofed.
In North America, local calls, unless made through a PBX (Private Branch
eXchange, a privately operated telephone switch) or recorded on Automatic
Number Identification (ANI, also known as "Caller-ID") would not be recorded.
England, however, has local measured service. I would therefore have thought
that identifying whether a call was made would be a simple task. It is
possible, though, that the only record is that you made a call for a certain
time within a certain zone.
A Ceephone is basically a terminal/modem combination. The American TDD, I
believe, uses a standard 300 bps B.11 103 modem. 300 bps is ample speed
because a TDD is essentially a "talk" or "CHAT" function: what I type appears
on your screen, and what you type appears on mine. At first glance, therefore,
the uninitiated would say that such a system is easy to spoof. There is no
voice to recognize, so it would be easy to fool someone.
This, however, is an overly simplistic view. As anyone who uses talk, CHAT or
PHONE knows, everyone is an individual. How do they start the conversation?
Do they use capital letters or not? Do they use abbreviations? What type?
And, speaking of typing, how fast can they? How well can they? How many
mistakes do they make? How far back are they willing to erase to correct a
mistake? For anyone who has used such a system for any time, it is almost
impossible to change between two people even if the party on the remote
terminal doesn't know them. Faking someone else is pretty much out of the
question.
Not even people can pass the Turing test.
copyright Robert M. Slade, 1994
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