Institute of Electrical & Electronic Engineers
In this paper the authors study the important issue of verifying Service Level Agreement (SLA) in a semi-trusted (or untrusted) cloud. Cloud computing services promise elastic computing and storage resources in a pay-as-you-go way. A SLA between a Cloud Service Provider (CSP) and a user is a contract which specifies the resources and performances that the cloud should offer. However, the CSP has the incentive to cheat on SLA, e.g., providing users with less CPU and memory resources than that specified in the SLA, which allows the CSP to support more users and make more profits. A malicious CSP can disrupt the existing SLA monitoring/verification techniques by interfering the monitoring/measurement process.