[cryptography] Question regarding common modulus on elliptic curve cryptosystems AND E-CASH
James A. Donald
jamesd at echeque.com
Wed Mar 24 21:16:36 EDT 2010
On 2010-03-23 1:09 AM, Sergio Lerner wrote:
> Reading the literature, I couldn't find a e-cash protocol which :
> - Hides the destination / source of payments.
> - Hides the amount of money transferred.
> - Hides the account balance of each person from the bank.
> - Allows off-line payments.
> - Avoids giving the same "bill" to two different people by design.
> This means that the protocol does not need to detect the use of
> cloned "bills".
> - Gives each person a cryptographic proof of owning the money they
> have in case of dispute.
> I someone points me out a protocol that manages to fulfill this
> requirements, I'd be delighted. I think I can do it with a
> commutative signing primitive, and a special zero-proof of
Gap Diffie Helman gives you a commutative signing primitive, and a
zero-proof of knowledge.
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