Contrastive Decoding Diffing recovers exact implanted facts from finetuned LLMs via logit-space differences between finetuned and base models, outperforming white-box baselines with less access.
Con-recall: Detecting pre-training data in LLM s via contrastive decoding
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Reading the Finetuning Prior: Verbatim Content Recovery via Contrastive Decoding Diffing
Contrastive Decoding Diffing recovers exact implanted facts from finetuned LLMs via logit-space differences between finetuned and base models, outperforming white-box baselines with less access.