Homomorphic signature schemes are an important primitive for many applications and since their introduction numerous solutions have been presented. Thus, in this work we provide the first exhaustive, complete, and up-to-date survey about the state of the art of homomorphic signature schemes. First, the general framework where homomorphic signatures are defined is described and it is shown how the currently available types of homomorphic signatures can then be derived from such a framework. In addition, this work also presents a description of each of the schemes presented so far together with the properties it provides. Furthermore, three use cases, electronic voting, smart grids, and electronic health records, where homomorphic signature schemes can be employed are described. For each of these applications the requirements that a homomorphic signature scheme should fulfill are defined and the suitable schemes already available are listed. This also highlights the shortcomings of current solutions. Thus, this work concludes with several ideas for future research in the direction of homomorphic signature schemes.
In the aftermath of the last financial crisis, on both sides of the Atlantic banking supervisors were given new supervisory and enforcement powers, which are often of a substantially punitive-criminal nature. In Europe in particular, the establishment of the Single Supervisory Mechanism within the European Central Bank substantially increased centralised investigatory and sanctioning powers. This major innovation, together with the development of forms of real-time monitoring of banking (often digital) records, challenges traditional banking criminal investigations in their national-based and analogue dimension.The book offers a comprehensive account and perspective analysis of the interactions between the criminal and administrative nature of such new powers, highlighting their “punitive” overall nature and their impact on fundamental rights. Covering both the US and the EU regulatory frameworks, it presents unprecedented, trans-systemic research between criminal law and procedure, and between regulatory and administrative law, at the international, European and national level.The book also includes a rich and detailed selection of case law from the US and the European supreme courts, with a specific focus on CJEU and ECtHR decisions.
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