James A. Donald
jamesd at echeque.com
Thu Sep 22 20:46:51 EDT 2011
On 2011-09-23 8:33 AM, Nico Williams wrote:
> In your view then, is the alternative at all a public key based
> crypto system? If yes, is it SSH (or SSH-like) "trust on first
> contact" or something else?
In order to shop, one needs a third party mediating transactions
*THEY* should issue certificates. The Visa certificate should signify
"This merchant is trusted by Visa to accept Visa."
And further, you should have a client app on your computer for dealing
with shared secrets, which is only capable of attempting a visa payment
with an entity trusted by Visa.
More information about the cryptography