In message <[EMAIL PROTECTED]>, Antonomasia writes:
> "Arnold G. Reinhold" <[EMAIL PROTECTED]>:
>
> quoting David Kahn's "The Codebreakers" (1967):
>
> > "... the department budgeted $221,400 in 1964 for 650 KW-7's. ... The
> > per-item cost of $4,500 may be due in part to refinements to prevent
> > inductive or galvanic interaction between the key pulses and the
> > plaintext pulses, which wire tappers could detect in the line pulse
> > and use to break the unbreakable system through its back door. "
> >
> > This would be the electro-mechanical equivalent of TEMPEST and
> > suggests that NSA was well aware of the compromising potential of
> > incidental emanations long before the computer communications era.
Similar attacks are discussed in Peter Wright's "Spycatcher". (Is that
legal yet in the U.K.?)
By chance, a profile of Transmeta's David Ditzel in today's NY Times states
that his father was working on Tempest issues for NSA circa 1962.
--Steve Bellovin
