Secure storage of user credentials and attributes in federation of clouds

The use of cloud computing and cloud federations has been the focus of studies in the last years. Many of these infrastructures delegate user authentication to Identity Providers. Once these services are available through the Internet, concerns about the confidentiality of user credentials and attributes are high. The main focus of this work is the security of the credentials and user attributes in authentication infrastructures, exploring secret sharing techniques and using cloud federations as a base for storing this information.