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暗号化されたVoIPストリームのビットレートの変化から会話内容を推測できる、とかいう研究をどっかで見た

https://www.schneier.com/blog/archives/2008/06/eavesdropping_o_2.html> That happens because the sampling rate is kept high for long complex sounds like “ow”, but cut down for simple consonants like “c”. This variable method saves on bandwidth, while maintaining sound quality.