Re: About TEMPEST

From: Berke Durak (obdk32768_at_ouvaton.org)
Date: 06/13/04 

Date: Sun, 13 Jun 2004 20:28:22 +0000 (UTC)

On 2004-06-13, John A. Malley <102667.2235@compuserve.com> wrote:
> Tom St Denis wrote:
> [...]
>>
>> The truth of the matter is TEMPEST is really not on topic here.
>
> TEMPEST fits the theme of protection against side-channel attacks, IMO.
> People are thinking about physical cryptography and how to stop leaking
> information from the physical calculation of steps in a cryptographic
> algorithm. Active research into formalizing the attacks using concrete
> security concepts are underway (see some of the recent papers on the
> IACR Cryptology ePrint archive, for instance.)

I guess that one can also apply software transformation to, at best
neutralise and at worst, obfuscate compromising emanations. Wasn't Ross
Anderson proposing to use some kind of "balanced signals" to reduce
emanations ? Can one do a perfectly symmetrical system having zero
total signature ?

(Correct me if I'm wrong). In the AB experiment, a toroidal magnet is
placed between two slits which are illuminated with electrons. The B
field is null outside the magnet and thus the electron path does not
enter the field. Yet the magnet changes the diffraction pattern. This
is explained by saying that the A magnetic potential field (a field such
that curl A = H ; its unicity is controversial) is modified outside the
magnet, affecting the electron phase. So that one may get signals out
of a a perfectly shielded device (in the sense that H and E are null
outside it).

>> Few if any people really know much about it that you're not likely
>> to get any seriously interesting responses here.
>
> Let's see what happens. :-)
>
> Someone may recall enough of "Fields, Waves and Transmission Lines" when
> reading through David Wagner's posted list o'links to generate a
> reasonable response.

Thank you. It seems that some people are getting nervous at the idea
of discussing TEMPEST here. 

-- 
Berke Durak

Relevant Pages

  • Re: Einsteins Doppler equation wrong?
    ... localized motion of flow of free or loose electrons. ... Slide a bar magnet ... velocity greater than c, or if you prefer, the tangential velocity of ... he was right about what we don't know about the electron. ...
    (sci.physics.relativity)
  • Re: Detecting Space-Time
    ... > What poles of an electron? ... So a magnetic field can exist without a moving charge too. ... I can suspend a human being on a permanent magnet. ...
    (sci.physics.relativity)
  • Re: flipping of earths poles
    ... I am excluding paramagnetic materials and most ... try this with a horseshoe magnet and thin plates. ... there are real photons and there are virtual photons. ... You don't mean the electron charge. ...
    (sci.physics)
  • Re: Some magnetic equivalents of electric entities
    ... Southern magnetic energy is emitted from the side of a magnet taking ... which uses electrical fields to move the electron beam ... First generation oscilloscopes used CRTs too. ... I suppose the phrase "electron beam" should be a dead giveaway ...
    (talk.origins)
  • Re: Quantum Flux
    ... I'm looking at magnet as sourced from the 1D in this topology. ... a flux analogy may be instructive for this, ... That an electron is different from the neutron and proton under this ... charge secondarily produced by it via this operation. ...
    (sci.physics)
Quantcast