[Cryptography] Why prefer symmetric crypto over public key crypto?
andrea at persephoneslair.org
Sun Sep 8 04:20:36 EDT 2013
On Sat, Sep 07, 2013 at 08:45:34PM -0400, Perry E. Metzger wrote:
> I'm unaware of an ECC equivalent of the Shor algorithm. Could you
> enlighten me on that?
Shor's algorithm is a Fourier transform, essentially. It can find periods of
a function you can implement as a quantum circuit with only polynomially many
invocations. In particular, when that function is exponentiation in a group,
it can find the orders of group elements. This allows finding discrete
logarithms in BQP for any group in which exponentiation is in P.
<andrea at persephoneslair.org>
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