[Resource Topic] 2018/858: Stronger Security for Sanitizable Signatures

Welcome to the resource topic for 2018/858

Stronger Security for Sanitizable Signatures

Authors: Stephan Krenn, Kai Samelin, Dieter Sommer


Sanitizable signature schemes (SSS) enable a designated party (called the sanitizer ) to alter admissible blocks of a signed message. This primitive can be used to remove or alter sensitive data from already signed messages without involvement of the original signer. Current state-of-the-art security definitions of SSSs only dene a \weak" form of security. Namely, the unforgeability, accountability and transparency definitions are not strong enough to be meaningful in certain use-cases. We identify some of these use-cases, close this gap by introducing stronger definitions, and show how to alter an existing construction to meet our desired security level. Moreover, we clarify a small yet important detail in the state-of-the-art privacy definition. Our work allows to deploy this primitive in more and different scenarios.

ePrint: https://eprint.iacr.org/2018/858

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