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This paper studies the possibility of using TCG (Trusted Computing Group) specifications to establish trust in Cloud Computing, especially between the provider of Cloud Computing infrastructures and his customers. The first part describes the context and the motivations that led to TCG specifications. The second part describes the architecture, the functions and the properties of TPM (Trusted Platform Module) which is the root of trust in TCG. The last part analyses several approaches to adapt TPM in order to build trust in Cloud computing.