Mike Bursell

Trust in Computer Systems and the Cloud


Скачать книгу

is self-evidently vital. Banks and other financial institutions are so important to the smooth running of (capitalist) society that governments will not infrequently move in to prop up a bank when trust in it begins to falter. The assurance associated with trust here is generally around whether a bank has sufficient assets to be able to provide its customers with their money when requested. But there is a greater and more dangerous concern against which financial institutions—or maybe, more broadly, frameworks—must guard: trust in a currency itself. By this, we really mean there is a generally accepted assurance that the currency will hold its value over time, or at least not deviate (particularly downwards) too sharply over time in terms of its purchasing power.

      It has become clear, with the rise of blockchain-backed crypto-currencies as an alternative (for some) to traditional fiat currencies, that the types of assurance, and how they are managed, are more complex than had generally been assumed. This topic is so important for our understanding of how trust is embodied in a particular set of systems that we will return to crypto-currencies in more detail in Chapter 6, “Blockchain and Trust”.

      For now, we will concentrate on more traditional institutions and some of the discussions on how trust is relevant to them. It should come as no surprise that this is a topic that has garnered a great deal of attention over the years. The idea that institutions are required because individual humans cannot “scale” to provide all of the services required is clearly not new. Monarchs and generals have appeared to manage large groups of people, trustworthy individuals have been appointed to dispense justice (at, for instance, Jethro's urging to Moses in Exodus 18), and the people who they serve—or are supposed to serve—need to have a trust relationship to them.

      Theories of Institutional Trust

      If we ignore Hobbes's preference for a monarch as the structural centre and overlook for now the question of how exactly a central authority is established (a topic to which we will return in Chapter 3, “Trust Operations and Alternatives”) we may consider the possibility that trust in this central authority could be continually re-established, but we must remember that such trust is really made up of many separate trust relationships to the authority. There is a distinction here between the set of trust relationships held and the reputation of the authority: the latter, while theoretically a reflection of all the former, is not a true view of it in the context of two important measures:

       The conglomeration of information about trust relationships will always be imperfect in practice, in the same way that a map is never a true representation of a tract of land (a perfect representation becomes more than a representation and becomes part of what it is representing19).

       Reputation is information allowing an entity to consider the formation—or tuning—of a trust relationship rather than the relationship itself.

      Who Is Actually Being Trusted?