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A comment on Facebook Portal – Privacy review. Parent comment

Re:Facebook Portal – Privacy review by crematoria on Wednesday November 27, 2019 @12:46PM (#21650098)
What metadata has yet to and can be encrypted? The recipient, the send time and the message size seem impossible to encrypt.
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Re:Facebook Portal – Privacy review by prophesi on Wednesday November 27, 2019 @01:01PM (#21650258)
I think the better question is, "What could count as metadata that we don't have to encrypt?"

But to answer yours: https://github.com/vuvuzela/vuvuzela

Encrypting metadata is a huge challenge. In the meantime, our best bet is to use open-source systems that we know won't be harvesting metadata.

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