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Abstract
Previous security research efforts orbiting around graphs have been
exclusively focusing on either (de-)anonymizing the graphs or understanding the
security and privacy issues of graph neural networks. Little attention has been
paid to understand the privacy risks of integrating the output from graph
embedding models (e.g., node embeddings) with complex downstream machine
learning pipelines. In this paper, we fill this gap and propose a novel
model-agnostic graph recovery attack that exploits the implicit graph
structural information preserved in the embeddings of graph nodes. We show that
an adversary can recover edges with decent accuracy by only gaining access to
the node embedding matrix of the original graph without interactions with the
node embedding models. We demonstrate the effectiveness and applicability of
our graph recovery attack through extensive experiments.