  With the development of Information and Communication Technologies, trust has
been applied more and more in various scenarios. At the same time, different
organizations have published a series of trust frameworks to support the
implementation of trust. There are also academic paper discussing about these
trust standards, however, most of them only focus on a specific application.
Unlike existing works, this paper provides an overview of all current available
trust standards related to communication networks and future digital world from
several main organizations. To be specific, this paper summarizes and organizes
all these trust standards into three layers: trust foundation, trust elements,
and trust applications. We then analysis these trust standards and discuss
their contribution in a systematic way. We discuss the motivations behind each
current in forced standards, analyzes their frameworks and solutions, and
presents their role and impact on communication works and future digital world.
Finally, we give our suggestions on the trust work that needs to be
standardized in future.
