Update assignment_and_exam.md

wyhitcs · Apr 11, 2016 · 10657e7 · 10657e7
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@@ -289,16 +289,22 @@ Homework
 
 2015-EX1-3-ReputationBasedTrustManagement-RuleBasedTrustManagement
 
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+* Explain briefly how the concept of risk plays a role in reputation-based trust man- agement and rule-based trust management.
 
 2014-EX1-4-TrustNegotiation
 
+![](2014-EX1-4.png)
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 2013-EX1-4-ReputationBasedTrustManagement-RuleBasedTrustManagement
 
+* Explain briefly the main differences between a rule-based trust management system and a reputation system. Give also two scenarios in which the first one is more suitable for a reputation system and the second one is more suitable for a rule-based system.
+
 2013-EX2-5-datacentric-linkcentricprotection
 
+![](2013-EX2-5.png)
+
 2012-EX2-6-confidentialityattransport
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+ ![](2012-EX2-6.png)
 
  ## Privacy-aware Access Control 1