ISO 19626-2-2021 pdf free download – Processes, data elements and documents in commerce, industry and administration — Trusted communication platform for electronic documents — Applications.
4.2TCP relational architecture
Even if some communities intend to establish a TCP, they could not implement it in case their businessand technical environments are different.
The particular authentication level, applied technology and communication protocol, etc. in eachlinkage need to be arranged properly by designing after classifying ‘TCP main’ and ‘TCP client’ evenunder various existing legacy system environments (refer to the iSo 19626-1:2020,5.2).Figure 1 showstwo interfaces.
a)TCP client interface
TCP client interface’ refers to an area inter-linked between a TCP communication client and a TCPcommunication server.Apart from various existing legacy system environments, a TCP communicationclient chooses and delegates a TCP communication server as its agent for trusted communication.At thispoint, ‘TCP client interface’ should be agreed and linked by the SLA (service level agreement)suggestedby the communication server. Thus, in this interface, the communication server can function an agentof the communication client to transmit the requested e-document(s) in a trusted manner under aTcParchitecture.
A TCP requires a standard interface for common linkage that a communication client and a servershall comply with. Then there are advantages of being able to provide convenience or efficiency of TCPoperation to the communication clients. lf a communication client wants to change its agent into theother communication server in a TCP, the communication client is able to change easily with it withoutbeing 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 e-identity by going through the process of verifying it
from the TTP identity directory, this entity becomes a participant as aTCPcommunication client.A TCP communication client can participate in trusted communication after signing a serviceagreement provided by the communication server. This means the communication client doesnot perform the direct communication with the other communication client($).
ATCP communication client can delegate trusted communication after authentication ofthe TCPcommunication server in the PR3(communication authentication process).
b)TCP main interface
‘TCP main interface’ refers to an area which performs practical trusted communication through threelinkages that shall comply with a communication interface specification (see Reference [6]). TCP main’has the following types of linkage:
1) Main1 linkage: between a TCP communication server and a TTP identity directory
– For the communication server to send or receive e-documents on the behalf of communication client,
information on the TCP communication server shall be registered in the TTP identity directory in thePR1 (communication server registration process).
The newly registered TCP communication server shall get added to the whitelist as a trusted list in theidentity directory. Then the identity directory shall notify the changed whitelist to the other registeredcommunication servers in the PR2 (e-identity registration process).
Communication server shall query to the identity directory in order to acquire and verify informationon the relying party of reception in the PR4 (e-document transmitting process).
2)Main2 linkage: between TCP communication servers
When a communication server transmits e-documents by inter-linking with the communication serverof relying party, this communication server acts as a transmitting server.ISO 19626-2 pdf download.