Re:What the Quantum Internet Has in Store
by marcosdumay on Monday October 29, 2018 @02:38PM
(#18329990)
Well, let's go...
> Quantum key exchange is a way to distribute keys, which will be used in some symmetric encryption scheme
The largest use of an asymmetrical cryptographic algorithm is key distribution, for use with a symmetric algorithm.
> That scheme has security that does not depend on any "difficulty" conjectures. It is "information theoretically perfect" modulo implementation bugs.
Up to this point, I've never seen any design of quantum encryption that provides any actual security. It's an abstract property of them that there should be one way to get physical security, just like it's a property of computing that there should be some good NP-hard problem one can base a cryptographic algorithm on. AFAIK, both are open problems.
> Quantum key exchange is a way to distribute keys, which will be used in some symmetric encryption scheme
The largest use of an asymmetrical cryptographic algorithm is key distribution, for use with a symmetric algorithm.
> That scheme has security that does not depend on any "difficulty" conjectures. It is "information theoretically perfect" modulo implementation bugs.
Up to this point, I've never seen any design of quantum encryption that provides any actual security. It's an abstract property of them that there should be one way to get physical security, just like it's a property of computing that there should be some good NP-hard problem one can base a cryptographic algorithm on. AFAIK, both are open problems.