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Abe

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  1. Encryption of all metadata

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    52 comments  ·  Proton Mail & Calendar » New feature  ·  Admin →
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    Under review  ·  AdminProton (Admin, Proton) responded

    We have given this quite a bit of thought, but at the present moment, it is not clear the advantages would outweigh the disadvantages.

    The biggest problem is search. Encrypting all metadata would break metadata search entirely on the web client as there is still no efficient way to handle search of encrypted data within a browser.

    Secondly, metadata encryption’s value from a privacy standpoint is also somewhat dubious. Because we ultimately must deliver the message to the recipient, we must know who the recipient is. At the current time, there still isn’t any proven and viable way to work around this.

    Metadata encryption is an area of continued research for us, and when the opportunity arises and the technology for doing this matures, we will definitely implement it in ProtonMail.

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    Abe commented  · 

    Very disappointed that in 2025 Proton is STILL not encrypting metadata/subject line... As someone else here has written, of the THOUSANDS of emails I get among all my email services, I NEVER remember a subject line for a search. And even if I did, PRIVACY is far more important to me than search convenience. It discloses far too much info that subject/sender are visible to anyone (or any authority) that gains access to Proton's servers. This is a major issue for me and prevents me from making Proton my main email service provider.

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