Trusted Cloud Computing

Cloud Computing is the technology of using central remote servers to maintain data and applications, and allows companies to use those shared resources without any care about installing or maintaining those resources. The main concern with this remote processing is the leak of data confidentially. This report summarizes the design of a trusted cloud computing platform (TCCP) for addressing this concern. IntroductionTo address the security leak in cloud computing environment, you can think why we do not just use data encryption, and the answer is that unfortunately the risk here is not in storing the data encrypted, but in the data processing as any processing is done to the clear data; which means that remote system admin who has privilege, and access to the physical environment can develop sophisticated attacks like cold boot attack and get access to this data. Background Cloud service providers offer services at various layers in software stack.At lower layer, Infrastructure as a Service (IaaS) providers are giving their customers access to the entire virtual machine (VM). At higher layers, Software as a Service (SaaS) systems like Google Docs software. This report is talking about securing IaaS implementations as it is more manageable.

IaaS implementation consists of a set of nodes inside a cluster; each of them runs a virtual machine monitor (VMM) to host customer virtual machines, and all are managed by a cloud manager (CM).The trusted computing group proposed the standard for the design of Trusted Platform Module (TPM) chip offering security based on asymmetric encryption, where each party sends a message encrypted by its private key to authenticate itself. Till now we are waiting the TCCP to address the risk of physical access of privilege users. Trusted Cloud Computing Platform The goal for this platform is to make computations of VMs confidential, and allow the consumers to verify this.To do this a trusted virtual Machine Monitor (TVMM) is installed on each node; this is done using TPM to ensure security installation, guarantee that all VMs run on nodes within the security perimeter, and prevent privilege users from accessing or modifying them. All nodes are managed by the Trusted Coordinator (TC) which maintain a record for each node located in the security perimeter, and verify the user that IaaS services is secured especially in the critical moments like lunch, migrate.The external trusted entity (ETE) that hosts the TC, must not give any privileges to the admin of the IaaS perimeter, so he cannot tamper with the TC.

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Node management is secured throw the exchange of different messages to make dual authentication between nodes, and the TC to avoid the impersonation by the attacker. Each party authenticates itself using its private key. After that TC can mark the node as trusted in its node database, this is done by keeping the public key of that node.

For securing virtual machines, TCCP guarantee that the VMs are lunched in the trusted zone, and that any privileged user can not inspect or tamper the VMs. This is done by public-private keys to secure and authenticate the messages exchanged between VMs and consumers. Conclusion As we have seen in that report; the design of trusted cloud computing platform aims to achieve the confidentiality and integrity of companies’ data, and to verify this security to companies.

Author: Kelvin Rivera


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