3.  Introduction

• Security from here:

(n.) In the computer industry, refers to techniques for ensuring that data stored in a computer cannot be read or compromised by any individuals without authorization. Most security measures involve data encryption and passwords. Data encryption is the translation of data into a form that is unintelligible without a deciphering mechanism. A password is a secret word or phrase that gives a user access to a particular program or system.

• Trust: Trust is a judgement of unquestionable utility ( Marsh, S., Formalising Trust as a Computational Concept. Ph.D. Thesis. Department of Mathematics and Computer Science, University of Stirling, 1994)

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