A Fair Exchange Protocol for Attribute Certification

In recent years, due to the rapid growth of the Internet, it become possible to do economy activities easily, whereas the service for which it is necessary to confirm identities in virtual world increased. Internet users need to disclose their own individual/private information on the network. In this situation, a dilemma has occurred because internet users have no evidence about whether they could disclose their own attributes to another entities such as service providers. This paper treats about the fair exchange protocols for attribute certification and proposes a simple method based on a zero-knowledge protocol over the Asokan-Shoup-Waidner fair exchange protocol for two parties.