Page 264 - Trust in ICT 2017
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5                                                    Trust in ICT



                                                      Appendix II


                                             Trustworthiness attributes
                            (This appendix does not form an integral part of this Recommendation.)

            This  appendix  provides  some  descriptions  about  trustworthiness  attributes.  Table  II.1  shows  general
            description of trustworthiness attributes which are introduced in clause 7.1.1.

                                           Table II.1 – Trustworthiness attributes


              Trust-worthiness    Attributes                             Description
                                                The quality or state of something that is not easily changed or likely
                                                to change at any time.
                                                Stability means that a physical things perform its own operation
                                                consistently. That is, with a given input, the physical thing always
                               Stability
                                                gives the same output. Users may consider cyber objects to be stable
                                                if they performs communication, control, and computing functions
                                                work continuously. In other words, stability might imply that a
                                                stakeholder continuously performs his/her role.
                                                The ability of an entity to perform a required function sufficiently
                                                under any conditions.
                                                Reliability means that a physical thing works properly by following
                               Reliability      user’s requests at any condition. The reliability of a cyber object
                                                might imply that the cyber object fulfils the required quality of
                                                service. The reliability can be measured as probability that an entity
                                                correctly performs a required job in a specified period of time under
                                                stated conditions.
                                                The ability of something to adapt to increased demands. The
                                                capability of a system or process to handle a growing amount of
                                                work, or its potential to be enlarged in order to accommodate that
             Ability /                          growth.
             Capability        Scalability      Cyber-physical systems which can afford to handle numerous
                                                sensors and their measured data might be judged scalable. Cyber
                                                objects that can process huge amount of queries and requests also
                                                might be considered as scalable.
                                                The ability to protect the entity from existing risk and danger; the
                                                ability to take care of oneself not to be in danger of oneself. The
                                                ability to operate without risk of injury or harm to users and the
                                                system’s environment.
                               Safety
                                                A service that adopts the cyber security system might be thought
                                                safe from existing internal and external cyber-attack. On the other
                                                hands, the device itself might be safe when the device satisfies
                                                safety certification of each country.
                                                Strong and effective in all or most situations and conditions. The
                                                ability of a system to cope with errors during execution and
                                                erroneous input. The capability of the service to behave in an
                                                acceptable way in anomalous or unexpected situations or when the
                               Robustness
                                                context changes.
                                                Users might consider the system with backup process and fault
                                                tolerant robust. For example, the communication system might be
                                                established with robustness by installing duplicate paths to each


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