Simply asking a large language model 'have you seen this user?' or comparing its recommendations after prompt poisoning can reveal whether a user's interactions are in the hidden prompt of an ICL-based recommender.
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Membership Inference Attacks on In-Context Examples in LLM-based Recommender Systems
Simply asking a large language model 'have you seen this user?' or comparing its recommendations after prompt poisoning can reveal whether a user's interactions are in the hidden prompt of an ICL-based recommender.