What Is Trust? ........................................................................................................ 14 Dening Trust ................................................................................................... 14 Trust Modeling ................................................................................................. 14

What Is Cloud Computing? ................................................................................. 16 Cloud Computing ............................................................................................ 16 Current Trends in Cloud Computing ............................................................ 17 Cloud Services .................................................................................................. 18 Advantages of Cloud Computing Services .................................................. 19

Requirement of Trust in Cloud............................................................................ 19 Trust Requirement in Cloud ........................................................................... 19 Trust and Cloud: Current Trends ................................................................... 21

Solutions for Ensuring Trust in Cloud Computing ..........................................22 Trust Evaluation Based ....................................................................................22 Module-Based Solution ................................................................................... 24 Layer-Based and Trusted Computing-Based Solutions ..............................25 Cooperation-Based Solutions ......................................................................... 27 Trust Model-Based Solutions ..........................................................................28

Challenges in Deploying Trust-Based Solutions in Cloud ..............................30 Trust: User Perspective .................................................................................... 31 Challenges in Establishing Trust on Cloud Computing .............................33

Ensuring Trust in Cloud Environment ..............................................................35 Conclusions ............................................................................................................ 37 References ...............................................................................................................38

Defining Trust