Flaw and modification of the iKP electronic payment protocols
We found that the 2KP/3KP electronic payment protocols as well as the 1KP electronic payment protocol do not possess a probably important property. The property is that if an acquirer authorizes a payment, then both the buyer and seller concerned always agree on it, which is called agreement property in this article. We also propose a modification to have 2KP/3KP possess the property. (C) 2003 Elsevier Science B.V. All rights reserved.
electronic payment protocol agreement property safety/security in digital systems