Chase, M; Meiklejohn, S; (2016) Transparency overlays and applications. In: Weippl, E and Katzenbeisser, S and Kruegel, C and Myers, A and Halevi, S, (eds.) CCS '16: Proceedings of the 2016 ACM SIGSAC Conference on Computer and Communications Security. (pp. pp. 168-179). Association for Computing Machinery (ACM): New York, NY, USA.

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Abstract

In this paper, we initiate a formal study of transparency, which in recent years has become an increasingly critical requirement for the systems in which people place trust. We present the abstract concept of a transparency overlay, which can be used in conjunction with any system to give it provable transparency guarantees, and then apply the overlay to two settings: Certificate Transparency and Bitcoin. In the latter setting, we show that the usage of our transparency overlay eliminates the need to engage in mining and allows users to store a single small value rather than the entire blockchain. Our transparency overlay is generically constructed from a signature scheme and a new primitive we call a dynamic list commitment, which in practice can be instantiated using a collision-resistant hash function.

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