ISO 19626-2-2021 pdf download.Processes, data elements and documents in commerce, industry and administration一Trusted communication platform for electronic documents一 Part 2: Applications.
4.2 TCP relational architecture
Even if some communities intend to establish a TCP, they could not implement it in case their business and technical environments are different.
The particular authentication level, applied technology and communication protocol, etc. in each linkage need to be arranged properly by designing after classifying ‘TCP main’ and ‘TCP client’ even under various existing legacy system environments (refer to the ISO 19626-1:2020, 5.2). Eigur1 shows two interfaces.
a) TCP client interface
‘TCP client interface’ refers to an area inter-linked between a TCP communication client and a TCP communication server. Apart from various existing legacy system environments, a TCP communication client chooses and delegates a TCP communication server as its agent for trusted communication. At this point, ‘TCP client interface’ should be agreed and linked by the SLA (service level agreement) suggested by the communication server. Thus, in this interface, the communication server can function an agent of the communication client to transmit the requested e-document(s) in a trusted manner under a TCP architecture.
A TCP requires a standard interface for common linkage that a communication client and a server shall comply with. Then there are advantages of being able to provide convenience or efficiency of TCP operation to the communication clients. If a communication client wants to change its agent into the other communication server in a TCP, the communication client is able to change easily with it without being dependent on the proprietary interface of a specific communication server.
1) Client linkage: between a TCP communication client and a TCP communication server
— Once the entity gets to register its own c-identity by going through the process of verifying it from the TTP identity directory, this entity becomes a participant as a TCP communication client.
— A TCP communication client can participate in trusted communication after signing a service agreement provided by the communication server. This means the communication client does not perform the direct communication with the other communication client(s).
— A TCP communication client can delegate trusted communication after authentication of the TCP communication server in the PR3 (communication authentication process).
b) TCP main Interface
‘TCP main interface’ refers to an area which performs practical trusted communication through three linkages that shall comply with a communication interface specification (see Reference [61). ‘TCP main’ has the following types of linkage:
1) Mainl linkage: between a TCP communication server and a TTP identity directory
— For the communication server to send or receive c-documents on the behalf of communication client, information on the TCP communication server shall be registered in the TTP identity directory in the PR1 (communication server registration process).
— The newly registered TCP communication server shall get added to the whitelist as a trusted list in the identity directory. Then the identity directory shall notify the changed whitelist to the other registered communication servers in the PR2 (c-identity registration process).
— Communication server shall query to the identity directory In order to acquire and verify Information on the relying party of reception in the PR4 (c-document transmitting process).
2) Main2 linkage: between TCP communication servers
— When a communication server transmits c-documents by inter-linking with the communication server of relying party, this communication server acts as a transmitting server.
— When a communication server has received the c-document, this communication server acts as a receiving server by processing it in the PR4 (c-document transmission process).ISO 19626-2 pdf download.