PKI Interoperability Models (February 2005)
3.3. The Asia PKI Forum
The ASIA PKI Forum is an international organisation composed of representatives from PKI forums in Korea, China, Japan, Taiwan, Singapore, Hong Kong, Macau and Hong Kong. Its goal is to promote co-operation and interoperability among PKIs across the Asia/Oceania region.
In 2004 the Asia PKI Forum Interoperability Working Group released the Asia PKI Interoperability Guidelines, a document created to promote the development of a mutually agreed regional PKI framework. The Guidelines have been described by the Working Group as a referential roadmap for those parties interested in achieving PKI interoperability.
These Guidelines describe five PKI models and list the technical standards needed for interoperable PKI schemes. The five models are:
- Bridge CA;
- Certificate Trust Lists; and
In addition to the PKI Trust Models, the Guidelines also list technical standards for the infrastructure, and the manner in which they should be adopted.
In 2001 Japan, Korea and Singapore formed their own Interoperability Working Group (the JKS-IWG) within the Asia PKI Forum, and conducted an interoperability pilot project. The results of the project are available online. The project successfully demonstrated complete interoperability in cross-border transactions between the three CAs from each country. It is notable that the project simultaneously used cross-certification in Korea and Japan and cross-recognition in Singapore. (Cross-certification and cross-recognition are discussed below.)
 Interoperability Working Group, Asia PKI Interoperability Guideline (Version 1.0), Asia PKI Forum, March 2004
 Version 2.0 of the Guidelines is expected shortly.