Challenge: generative large language models (LLMs) exhibit surprising capability and integrate previous tasks into a unified text generation formulation.
Approach: They propose a privacy evaluation benchmark to quantify the privacy leakage of language models.
Outcome: The proposed benchmark compares PPLMs with different privacy implementations to find out how privacy leakage is handled.

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Privacy Evaluation Benchmarks for NLP Models (2024.findings-emnlp)

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Challenge: Several kinds of privacy attacks are studied in depth, but they are non-systematic and lack a comprehensive understanding of the impact caused by the attacks.
Approach: They propose a privacy attack and defense evaluation benchmark in the field of NLP . they propose an improved attack method and a chained framework for privacy attacks .
Outcome: The proposed framework can be chained to achieve a higher-level attack objective.
Protecting Privacy in Multimodal Large Language Models with MLLMU-Bench (2025.naacl-long)

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Challenge: Large Language Models (LLMs) and Multimodal Large Language models (MLLMs) trained on vast web corpora can memorize and disclose individuals’ confidential and private data, raising legal and ethical concerns.
Approach: They propose a benchmark to assess unlearning algorithms from multiple perspectives and provide a baseline for existing generative models.
Outcome: The proposed benchmark consists of 500 fictitious profiles and 153 profiles for public celebrities, evaluated from both multimodal (image+text) and unimodal (text) perspectives.
A Comparative Analysis of Word-Level Metric Differential Privacy: Benchmarking the Privacy-Utility Trade-off (2024.lrec-main)

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Challenge: Differential Privacy (DP) has been used in NLP for years to address privacy concerns . privacy-enhancing technologies (PETs) are concrete technical solutions that can be incorporated into existing systems.
Approach: They compare different Differential Privacy algorithms for word-level NLP tasks . they propose concrete steps forward to combat privacy risks in NLP settings .
Outcome: The proposed methods perform better than the proposed methods on two NLP tasks.
PII-Bench: Evaluating Query-Aware Privacy Protection Systems (2026.acl-long)

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Challenge: Existing models do not detect PII in user prompts, despite their convenience . current models show significant limitations in determining PI I query relevance .
Approach: They propose a query-unrelated PII masking strategy and propose PIi-Bench . they propose 'quick-and-easy' PI I masking with a user query and context description .
Outcome: The proposed model performs well in basic PII detection, but shows significant limitations in query relevance.
PAPILLON: Privacy Preservation from Internet-based and Local Language Model Ensembles (2025.naacl-long)

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Challenge: Existing research has studied privacy in LLM training data memorization, but it does not prevent users from disclosing PII at inference time.
Approach: They propose a task for chaining API-based and local LLMs that uses public data to construct a benchmark that contains personally identifiable information (PII)
Outcome: The proposed model maintains high response quality for 85.5% of user queries while restricting privacy leakage to only 7.5%.
Selective Differential Privacy for Language Modeling (2022.naacl-main)

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Challenge: Existing methods to protect sensitive data from leaking are over-pessimistic and undifferentiated.
Approach: They propose a new privacy notion, selective differential privacy, to provide rigorous privacy guarantees on the sensitive portion of the data to improve model utility.
Outcome: The proposed privacy-preserving mechanism achieves better utility while remaining safe under various privacy attacks compared to baselines.
Differentially Private Natural Language Models: Recent Advances and Future Directions (2024.findings-eacl)

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Challenge: Recent advances in deep learning have led to great success in various natural language processing tasks.
Approach: They propose a systematic review of recent advances in DP deep learning models . they discuss some differences and additional challenges of DP-NLP .
Outcome: The proposed method can prevent reconstruction attacks and protect against potential side knowledge while maintaining the privacy of sensitive data.
Controlling What You Share: Assessing Language Model Adherence to Privacy Preferences (2026.findings-acl)

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Challenge: Large language models (LLMs) are accessed via commercial APIs, but expose data to service providers.
Approach: They propose a framework where a local model uses natural language instructions to rewrite queries and paired them with synthetic privacy profiles to achieve better privacy preservation.
Outcome: The proposed model outperforms large-scale few-shot models in terms of privacy preservation and performance.
PrivaCI-Bench: Evaluating Privacy with Contextual Integrity and Legal Compliance (2025.acl-long)

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Challenge: Recent advances in generative large language models (LLMs) have enabled wider applicability, accessibility, and flexibility.
Approach: They propose a contextual privacy evaluation benchmark that covers the entire relevant social context through private information flows.
Outcome: The proposed benchmarks cover legal compliance, real court cases, privacy policies, and synthetic data.
Combating Security and Privacy Issues in the Era of Large Language Models (2024.naacl-tutorials)

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Challenge: a tutorial aims to provide a summary of risks and vulnerabilities in large language models . a number of studies have focused on security, privacy and copyright aspects of LLMs .
Approach: This tutorial seeks to provide a systematic summary of risks and vulnerabilities in large language models . authors will discuss security, privacy and copyright aspects of LLMs .
Outcome: This tutorial aims to provide a systematic summary of risks and vulnerabilities in large language models . it will also outline emerging challenges in security, privacy and reliability of LLMs .

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