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arXiv 2310.04035eess.AS
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一种基于密钥的用于卷积神经网络语音分类的隐私保护方法

A privacy-preserving method using secret key for convolutional neural network-based speech classification

Shoko Niwa, Sayaka Shiota, Hitoshi Kiya

AI总结:

针对语音分类领域隐私保护研究不足的问题,提出基于可逆随机矩阵的密钥加密方法,在ASR和ASV任务中实现密钥正确时加密数据与原数据效果一致,且具备抗重建攻击鲁棒性。

摘要:

本文提出了一种适用于卷积神经网络(CNN)语音分类任务的密钥隐私保护方法。近年来,图像分类研究领域已开发出诸多隐私保护相关方法,相比之下,语音分类研究领域对这类风险的考量甚少。为推动语音分类领域的隐私保护研究,我们为基于CNN的语音分类系统提供了一种带密钥的加密方法。\n该加密方法基于具有可逆逆矩阵的随机矩阵构建。使用正确密钥加密的语音数据,可被采用随机矩阵逆矩阵生成的加密核的模型所接收。尽管加密后的语音数据被严重失真,但在提供正确密钥时,分类任务仍可准确执行。此外,本文还评估了从加密语谱图和波形中重建原始信息的难度。\n实验中,我们在自动语音识别(ASR)和自动说话人验证(ASV)任务上测试了所提加密方法。结果表明,在基于transformer的ASR系统和带自监督前端的x-vector ASV系统中,提供正确密钥时,加密数据的使用效果与原始数据完全一致,同时也验证了加密数据抵御重建攻击的鲁棒性。

英文摘要:

In this paper, we propose a privacy-preserving method with a secret key for convolutional neural network (CNN)-based speech classification tasks. Recently, many methods related to privacy preservation have been developed in image classification research fields. In contrast, in speech classification research fields, little research has considered these risks. To promote research on privacy preservation for speech classification, we provide an encryption method with a secret key in CNN-based speech classification systems. The encryption method is based on a random matrix with an invertible inverse. The encrypted speech data with a correct key can be accepted by a model with an encrypted kernel generated using an inverse matrix of a random matrix. Whereas the encrypted speech data is strongly distorted, the classification tasks can be correctly performed when a correct key is provided. Additionally, in this paper, we evaluate the difficulty of reconstructing the original information from the encrypted spectrograms and waveforms. In our experiments, the proposed encryption methods are performed in automatic speech recognition~(ASR) and automatic speaker verification~(ASV) tasks. The results show that the encrypted data can be used completely the same as the original data when a correct secret key is provided in the transformer-based ASR and x-vector-based ASV with self-supervised front-end systems. The robustness of the encrypted data against reconstruction attacks is also illustrated.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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