I saw this a while back and really question it's usability. While it's
   *technically* possible, it seems far to complex for the average hacker
   and far too risky for the intel community.  People who use encryption
   tend to be slightly more paranoid than the average user. Suddenly
   receiving a piece of encrypted, nonsense email might be enough to get
   their key. But I also suspect that, in many cases, that key would
   quickly be revoked and reissued.
   Sent from my mobile device

   On Apr 5, 2014, at 0:44, jim bell <[1]jamesdbell9@yahoo.com> wrote:

   [2]http://phys.org/news/2013-12-trio-rsa-encryption-keys-noise.html#nRl
   v
   (Phys.org) —A trio of researchers in Israel has discovered that it is
   possible to crack 4096-bit RSA encryption keys using a microphone to
   listen to high-pitch noises generated by internal computer components.
   Adi Shamir (co-inventor of RSA), Daniel Genkin and Eran Tromer
   have [3]published a research paper describing the technique on a Tel
   Aviv University server.
   Read more
   at: [4]http://phys.org/news/2013-12-trio-rsa-encryption-keys-noise.html
   #jCp
   Computers make noises, the researchers explain, far beyond the whirring
   of the fan. The CPU, for example, emits a high pitched noise as it
   operates, fluctuating depending on which operations it is
   performing—other components do likewise. Suspecting that they might be
   able to exploit this characteristic of computers, the researchers set
   about creating software to interpret noise data obtained using simple
   microphones and very little other equipment. They also focused
   exclusively on trying to achieve one single feat: deciphering an RSA
   encryption key. After much trial and effort, the researchers found it
   could be done without much effort.
   Listening and detecting the noise made by a computer as it processes a
   single character in an encryption key would be impossible, of course,
   so the researchers devised a method that causes the noise to be
   repeated enough times in a row to enable capture of its signal. And
   that can only happen if the attacker is able to send a cyphertext to
   the machine that is to be attacked and have it processed. The
   cyphertext contains code that causes looping. By listening to how the
   computer processes the cyphertext, the researchers can map the noises
   made by the computer as it crunches different characters, thereby
   allowing encryption keys sent by others to be cracked.
   What's perhaps most frightening about this method is how easily it can
   be ported to various machines. The researchers found, for example, that
   by using a laptop and simple hardware and software they were able to
   crack encryption keys on a second laptop. Next, they did the same thing
   using a cell phone as the listening device. They suggest it could also
   be packaged completely in software and sent out as malware,
   hacking [5]encryption keys on infected devices and sending them back to
   the hacker.
   As a side-note, the researchers also found that low-bandwidth attacks
   on computers are also possible by measuring the electrical potential of
   a computer's chassis while the circuitry is busy doing its work.
    Explore further: [6]Researchers at Toshiba design quantum network for
   secure communications
   More information: RSA Key Extraction via Low-Bandwidth Acoustic
   Cryptanalysis: [7]www.tau.ac.il/~tromer/papers/acoustic-20131218.pdf
   Read more
   at: [8]http://phys.org/news/2013-12-trio-rsa-encryption-keys-noise.html
   #jCp

References

   Visible links
   1. mailto:jamesdbell9@yahoo.com
   2. http://phys.org/news/2013-12-trio-rsa-encryption-keys-noise.html#nRlv
   3. http://www.tau.ac.il/~tromer/papers/acoustic-20131218.pdf
   4. http://phys.org/news/2013-12-trio-rsa-encryption-keys-noise.html#jCp
   5. http://phys.org/tags/encryption+keys/
   6. http://phys.org/news/2013-09-toshiba-quantum-network.html#inlRlv
   7. http://www.tau.ac.il/~tromer/papers/acoustic-20131218.pdf
   8. http://phys.org/news/2013-12-trio-rsa-encryption-keys-noise.html#jCp

   Hidden links:
  10. http://phys.org/news/2013-12-trio-rsa-encryption-keys-noise.html#jCp
  11. http://phys.org/news/2013-12-trio-rsa-encryption-keys-noise.html
  12. http://www.tau.ac.il/~tromer/papers/acoustic-20131218.pdf
  13. http://phys.org/news/2013-12-trio-rsa-encryption-keys-noise.html#jCp