<![CDATA[Voice-based digital assistants for elderly patients with mild dementia are increasingly deployed but face serious threats from deepfake voice attacks that can impersonate family members. This research aimed to develop a system resilient to deepfake voice attacks by utilizing nonlinear frequency spectrum authentication derived from digital hearing aids already worn by the elderly. The methods employed included nonlinear feature extraction from acoustic feedback signals of hearing aids and Siamese Neural Network training with contrastive loss. The study involved 30 elderly individuals with mild dementia (MMSE scores 20-24) who used digital hearing aids. The results demonstrated that deepfake detection accuracy reached 96.7%, with a false rejection rate of 3.8%, a false acceptance rate of 2.4%, and an average authentication latency of 412 ms. This system required no active interaction from the elderly, thereby imposing no burden on their cognitive functions. This study concluded that hearing aid-based nonlinear frequency spectrum authentication effectively serves as a passive defense mechanism against deepfake voice attacks on elderly digital assistants.]]>
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