Organizer: Prof. Johannes Buchmann, Prof. Melanie Volkamer
In cloud computing, different commercial providers, e.g. Amazon, Google, or Microsoft, offers storage services to users. Secret sharing is responsible for generating shares of a document and store them within the servers of the providers. In particular, social secret sharing enables to distribute more shares to the most trustworthy servers and less shares to the servers that are likely to break the confidentiality. However, this approach requires over time an increasing storage space and computational overhead. Furthermore, situations where the document cannot be reconstructed or does not remain confidential occur. We overcome all these drawbacks by proposing an adaptive social secret sharing, which is built on dynamic secret sharing and employs a trust function taking into account two rather than one behaviour of the servers.