EER=50% does not imply perfect secrecy in voice anonymization; worst-case LLR should be used, and the rank-based metric reduces to the same LLR principle.
An evaluation metric, however, takes the attacker’s view, and the question is how close the LLR is to 0 for each probe utterance
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In Defense of Using Worst-case Privacy Disclosure as Privacy Evaluation Metric of Voice Anonymization
EER=50% does not imply perfect secrecy in voice anonymization; worst-case LLR should be used, and the rank-based metric reduces to the same LLR principle.