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  1. Newsgroups: sci.crypt
  2. Path: sparky!uunet!gatech!mailer.cc.fsu.edu!fsunuc.physics.fsu.edu!books
  3. From: books@fsunuc.physics.fsu.edu (Roger Books)
  4. Subject: Re: Quantum cryptography: a flawed premise?
  5. Message-ID: <books.28.0@fsunuc.physics.fsu.edu>
  6. Sender: news@mailer.cc.fsu.edu (Usenet News File Owner)
  7. Nntp-Posting-Host: nrb209a.physics.fsu.edu
  8. Organization: FSU nuclear physics
  9. References: <1992Oct12.184051.1@zodiac.rutgers.edu> <1992Oct13.061724.25758@netcom.com>
  10. Date: Tue, 13 Oct 92 14:29:20 GMT
  11. Lines: 34
  12.  
  13. In article <1992Oct13.061724.25758@netcom.com> rcain@netcom.com (Robert Cain) writes:
  14. >Newsgroups: sci.crypt
  15. >Path: mailer.cc.fsu.edu!gatech!darwin.sura.net!spool.mu.edu!umn.edu!csus.edu!netcom.com!rcain
  16. >From: rcain@netcom.com (Robert Cain)
  17. >Subject: Re: Quantum cryptography: a flawed premise?
  18. >Message-ID: <1992Oct13.061724.25758@netcom.com>
  19. >Organization: Netcom - Online Communication Services  (408 241-9760 guest) 
  20. >References: <1992Oct12.184051.1@zodiac.rutgers.edu>
  21. >Date: Tue, 13 Oct 1992 06:17:24 GMT
  22. >Lines: 18
  23. >leichter@zodiac.rutgers.edu writes:
  24. >: 
  25. >: The attack against the *cryptosystem*, as opposed to the attack against QM,
  26. >: goes like this:  The eavesdropper clones the photons and SAVES them - he
  27.  
  28.   I've already seen that if the attacker clones the photons and reads
  29. them he destroys the info sent on.  What if he clones them two ways and
  30. reads both of them simultaneously (sp)?  Does the info turn into both types
  31. of polarization?
  32.  
  33. >
  34. >How does he do this?  I know of no way to "save" a photon.  Somehow mirrors
  35. >would be involved and I think interaction with a mirror would alter the
  36. >polarization state.
  37. >
  38. >Bob
  39. >-- 
  40. >Bob Cain    rcain@netcom.com   408-358-2007
  41. >
  42. >
  43. >               PGP 1.0 or 2.0 public key available on request.
  44.  
  45. Roger
  46. books@fsunuc.physics.fsu.edu
  47.