Re: EC Key Derivation Problem
 From: Fabrice <fabrice.gautier@xxxxxxxxx>
 Date: Thu, 13 Mar 2008 16:51:28 0700 (PDT)
On Mar 13, 4:39 pm, Fabrice <fabrice.gaut...@xxxxxxxxx> wrote:
Hi,
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 ?
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...
The main purpose is to be able to compute the derived Public Key
without knowing the private root key.
Thanks
What about: f(a,k)=a*k and F(A,k)=k.A
Then:
b=f(a,k)=a*k (in Fp)
so:
F=(A,k)=k.A=k.(a.P)=(k*a).P=b.P=B ?
Does this works?
.
 References:
 EC Key Derivation Problem
 From: Fabrice
 EC Key Derivation Problem
 Prev by Date: EC Key Derivation Problem
 Next by Date: Nail Algorithm
 Previous by thread: EC Key Derivation Problem
 Next by thread: Re: EC Key Derivation Problem
 Index(es):
Relevant Pages
