Add to ORKGThe advent of information technology, the dramatic increase of computational and storage capacities along with the development of worldwide communications promise very personalized, well designed and convenient services. However, although privacy is an important right in our societies, these services often neglect and abuse their consumers' privacy, by collecting sensible data notably. This work focuses on the protection of privacy in information systems. For this, it is known that traditional cryptography (e.g. encryption or signature schemes) is necessary, for instance to ensure confidentiality, but it is not sufficient. To enable usability and privacy at the same time, stronger tools are required. Homomorphic cryptography is a possible a...