Re: EC Key Derivation Problem
 From: Kristian Gjøsteen <kristiag+news@xxxxxxxxxxxx>
 Date: Fri, 14 Mar 2008 07:22:35 +0000 (UTC)
Fabrice <fabrice.gautier@xxxxxxxxx> wrote:
Assuming a EC Private Key "a", and the public key "A=a.P"
I'm looking for a Private Key Derivation Function "f" and a Public Key
Derivation function "F" such that if "b=f(a,k)", then "B=b.P=F(A,k)"
Does such functions exist ?
I'm not really sure about what the point is, but the obvious answer is
that f is multiplication and F is point multiplication...
Actually I am sure they do (by definition) but do they have the
following properties:
 Is the knowledge of F gives any information about a, b, k or f ?
 Is the knowledge of f, k and b gives any information about a ?
 Is the knowledge of F, A and k gives any information about a or b ?
 Is the knowledge of F, B and A gives any information about k, a, or
b ?
 etc...
No, yes, yes, no, etc.
The main purpose is to be able to compute the derived Public Key
without knowing the private root key.
??

Kristian Gjøsteen
.
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