'Unbreakable' encryption introduced

  • #1
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Main Question or Discussion Point

I think this is the perfect place to discuss the possibilities of quantum cryptography. It seems to have become a reality now. Let's discuss whether this truly is unbreakable! We've heard it before, but is it different this time?

Perfect secrecy has come a step closer with the launch of the world's first computer network protected by unbreakable quantum encryption at a scientific conference in Vienna.
http://news.bbc.co.uk/1/hi/sci/tech/7661311.stm
 
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Answers and Replies

  • #2
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No encryption can be "unbreakable."

This holds by definition.
 
  • #3
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No encryption can be "unbreakable."

This holds by definition.
So if someone could break it then that would mean we have to rewrite the science books?
 
  • #4
CRGreathouse
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No encryption can be "unbreakable."

This holds by definition.
One-time pad? Quantum entanglement?
 
  • #5
mgb_phys
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It's not encryption it's only secure fibre links - this is not new (although the range might be a record)
It does however solve a problem that isn't the problem - it stops you being able to eavesdrop on a fibre by patching into the fibre.
If you have traffic data encrypted with modern algorithms like AES this isn't a problem.
The main drawback is that you can still eavesdrop everytime it goes through a switch or router - this technique only works for a single unbroken length of single mode fibre between two points.
 
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  • #6
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I don't see how this would protect from a "man in the middle" attack either. It seems a lot of effort for little benefit.
 
  • #7
mgb_phys
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It doesn't.

It's the classic security thing - a technology solution to a human problem.
eg. the cleaners found someone's password in the trash: solution double the number of bits in the encryption.
 

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