Siren: secure data sharing over P2P and F2F networks (Q2834171)

The main goal of this paper is to propose a privacy-preserving communication framework, wherein the sensible data is not stored by a singular trusted third party, but instead distributed to some predefined subset of users such that the large coalition of users is necessary to recover the data. In the proposed solution the data is stored within a special private network called a friend-to-friend (F2F) network and is distributed using a given secret sharing scheme. Furthermore, it is required that the original data is recovered only in the presence of a special event, called an 'alarm message'. Examples of such alarm message are extremities in medical data, S. O. S. signals in case a physical attack or stroke, etc.