no code implementations • 9 Nov 2022 • Pedro Faustini, Natasha Fernandes, Shakila Tonni, Annabelle McIver, Mark Dras
In this paper, we apply \textit{directional privacy}, via a mechanism based on the von Mises-Fisher (VMF) distribution, to perturb gradients in terms of \textit{angular distance} so that gradient direction is broadly preserved.
no code implementations • 19 Oct 2020 • Natasha Fernandes, Yusuke Kawamoto, Takao Murakami
Then we show that our mechanisms enable friend matching with high utility and rigorous privacy guarantees based on extended DP.
no code implementations • 26 Nov 2018 • Natasha Fernandes, Mark Dras, Annabelle McIver
We address the problem of how to "obfuscate" texts by removing stylistic clues which can identify authorship, whilst preserving (as much as possible) the content of the text.
no code implementations • 22 May 2018 • Natasha Fernandes, Mark Dras, Annabelle McIver
The problem of obfuscating the authorship of a text document has received little attention in the literature to date.
Cryptography and Security