Papers by Arlindo Rodrigues Galvão Filho
Safety Is Not Universal: The Selective Safety Trap in LLM Alignment (2026.findings-acl)
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Iago Alves Brito, Walcy Rios, Julia Soares Dollis, Diogo Fernandes Costa Silva, Arlindo Rodrigues Galvão Filho
| Challenge: | Existing safety evaluations of large language models aggregate harms under generic categories such as "Identity Hate" a bilingual benchmark identifies a selective safety trap, where defense rates vary by up to 42% within the same model solely based on the target group. |
| Approach: | They propose a bilingual adversarial benchmark to audit selective safety in large language models . defense rates vary by up to 42% within the same model solely based on target group . |
| Outcome: | The proposed benchmark identifies a selective safety trap in large language models . defense rates vary by up to 42% within the same model solely based on the target group. |
Modeling, Evaluating, and Embodying Personality in LLMs: A Survey (2025.findings-emnlp)
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Iago Alves Brito, Julia Soares Dollis, Fernanda Bufon Färber, Pedro Schindler Freire Brasil Ribeiro, Rafael Teixeira Sousa, Arlindo Rodrigues Galvão Filho
| Challenge: | This survey provides a comprehensive overview of the LLM-driven personality scenario. |
| Approach: | This survey provides a comprehensive overview of the LLM-driven personality scenario. |
| Outcome: | The proposed taxonomy analyzes the limitations of existing methods and identifies key research gaps. |
Proxy Barrier: A Hidden Repeater Layer Defense Against System Prompt Leakage and Jailbreaking (2025.findings-emnlp)
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Pedro Schindler Freire Brasil Ribeiro, Iago Alves Brito, Rafael Teixeira Sousa, Fernanda Bufon Färber, Julia Soares Dollis, Arlindo Rodrigues Galvão Filho
| Challenge: | Prompt injection and jailbreak attacks remain a critical vulnerability for large language models . a lightweight defense that interposes a proxy LLM between the user and the target model addresses this vulnerability . |
| Approach: | a lightweight proxy LLM is interposed between the user and the target model to prevent prompt injection and jailbreak attacks. |
| Outcome: | ProB outperforms baselines and achieves up to 98.8% defense effectiveness . it is deployable entirely at the API level and requires no access to model weights or prompts . |
BRSpeech-DF: A Deep Fake Synthetic Speech Dataset for Portuguese Zero-Shot TTS (2025.emnlp-main)
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Alexandre Costa Ferro Filho, Rafaello Virgilli, Lucas Alcantara Souza, F S de Oliveira, Marcelo Henrique Lopes Ferreira, Daniel Tunnermann, Gustavo Dos Reis Oliveira, Anderson Da Silva Soares, Arlindo Rodrigues Galvão Filho
| Challenge: | ADD detection is a key area of research for low-resource languages like Portuguese, which lacks high-quality datasets. |
| Approach: | They propose to provide the first publicly available ADD dataset for Portuguese, encompassing both Brazilian and European variants. |
| Outcome: | The proposed dataset contains over 458,000 utterances, including a smaller portion of real speech from 62 speakers and a large collection of synthetic samples generated using multiple zero-shot text-to-speech (TTS) models, each conditioned on the original speaker’s voice. |