ISO 19626-2:2021

INTERNATIONAL ISO
STANDARD 19626-2
First edition
2021-02
Processes, data elements and
documents in commerce, industry
and administration — Trusted
communication platform for
electronic documents —
Part 2:
Applications
Reference number
©
ISO 2021
© ISO 2021
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ii © ISO 2021 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Relational architecture of TCP . 2
4.1 Overview . 2
4.2 TCP relational architecture . 3
4.3 Functionalities of TCP components . 4
4.3.1 TTP identity directory . 4
4.3.2 TCP communication server. 5
4.3.3 TCP communication client. 8
4.3.4 TCE repository . 9
5 TCP processes .10
5.1 Overview of main processes .10
5.2 Description of each process .11
5.2.1 PR1 (communication server registration process) .11
5.2.2 PR2 (e-identity registration process) .12
5.2.3 PR3 (communication authentication process) .14
5.2.4 PR4 (e-document transmitting process) .15
5.2.5 PR5 (perusal confirmation process) .19
5.2.6 PR6 (TCE preservation process) .20
5.2.7 PR7 (communication verification process) .21
5.2.8 PR8 (spam message handling process) .22
6 TCP APIs .23
6.1 General .23
6.2 Network requirements for APIs .23
6.2.1 General.23
6.2.2 Security requirements .23
6.2.3 Common requirements for protocol .26
6.3 Requirements for service interface .29
6.3.1 APIs of TTP identity directory .29
6.3.2 APIs of communication server .30
6.3.3 APIs of TCE repository .32
Annex A (informative) Structure of TCE .33
Annex B (informative) Structure of message header .37
Annex C (informative) Detailed description for APIs .39
Bibliography .66
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 154, Processes, data elements and
documents in commerce, industry and administration.
A list of all parts in the ISO 19626 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved

Introduction
This document presents the TCP (trusted communication platform) system for trusted communication
in the open and distributed ICT (information communication technology) environment, as a connected
standard of ISO 19626-1.
The TCP system is a kind of middleware for connecting trusted communication in IoT (internet of
things) or cloud environments, that delivers the information between humans, organizations, and
devices by exchanging the e-documents via the TCP system components and stores the evidence of
executed communication.
This document specifies the functionalities of processes and APIs (application programming interfaces)
between TCP system components.
It intends to be described in the technology-neutral way in order that a TCP system can be implemented
by applying various wire-wireless applied services and communication protocols used in the real world.
The key points that are implicated to this document are as follows.
a) The communication protocol used for inter-connection between TCP components is a core function
of the application service layer in the distributed environment of wire and wireless communication.
The basic function of sending or receiving messages between the TCP system components compose the
common communication interface to deliver message(s) in a distributed computing system of wire and
wireless environment.
b) TCE (trusted communication evidence) can prove trusted communication in a TCP.
The TCP communication server executes reliable communication transactions, and create and store
TCE as the proof in a way of non-repudiation between the communication participants.
c) A TCP system can be adequately ported to various kinds of business communication systems.
A TCP system is connected as a transmit or receive module between the e-business systems connected
to be distributed with various work systems of B2B, e-government, and e-trade as well as the simple
electronic communication systems to transmit contents directly using the address of sender or receiver
(URLs, IP, address) such as the e-mail system as a related application system.
INTERNATIONAL STANDARD ISO 19626-2:2021(E)
Processes, data elements and documents in commerce,
industry and administration — Trusted communication
platform for electronic documents —
Part 2:
Applications
1 Scope
As a connected standard of ISO 19626-1, this document defines the communication interactions
between TCP system components and specifies their detailed interfaces — the processes and the APIs
of the TCP system components.
It provides the common communication interface for deployment and implementation of the system
components, and their functions in a specific technology-neutral way to those who consider applying
and establishing a TCP system.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 19626-1, Processes, data elements and documents in commerce, industry and administration — Trusted
communication platforms for electronic documents — Part 1: Fundamentals
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 19626-1 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
blacklist
list of e-identities (3.3) of the originators who are proved having ‘malicious intent’
Note 1 to entry: If a message is confirmed as spam (3.5), an e-identity who sent the spam is classified as a sender
having ‘malicious intent’.
Note 2 to entry: An addressee receiving a message from the originator in the blacklist can reject receiving the
message.
3.2
characteristic information
unique identifying information to identify the entity in the offline (real) world such as a resident
registration number, social security number, or identification number of an IoT device
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