Remote attestation is the activity of making a claim about properties of a target by supplying evidence to an appraiser over a network. Thanks to Linux Integrity Measurement Architecture (IMA) it is possible to maintain the chain of trust measurement up to the application layer. The goals of the kernel integrity subsystem are to detect if files have been accidentally or maliciously altered, both remotely and locally, appraise a file's measurement against a "good" value stored as an extended attribute, and enforce local file integrity. This thesis firstly describes history, architecture, version and capabilities of Trusted Platform Module (TPM), crucial component to perform remote attestation and, inside the second part, Keylime, an open-source tool for bootstrapping and maintaining trust in the cloud, is presented and evaluated.