D3S - a distributed storage service

In recent years, computing allowed an explosion of service provisioning in the cloud. The main paradigm dictates the migration of user information, such as documents, photos and others, from the desktop to the network, allowing anytime, anywhere access through the Internet. This paradigm provided a adequate environment to the emergence of online storage services, such as Amazon S3. This kind of service allows storing digital data in a transparent way, in a pay-as-you-go model. On the other hand, peer-to-peer networks have been responsible for most Internet tra c, mostly derived from the BitTorrent protocol. The inherent support to resource sharing, scalability and fault-tolerance, have been making this approach popular, particularly for le-sharing applications. This thesis presents an implementation of an S3 compatible storage service based on peer-to-peer networks, in particular, through the BitTorrent protocol. Several measurements are discussed, to assess di erences in access time and throughput.