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    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.

    An error occurred while saving the comment
    LPS commented  · 

    The subject line cannot be encrypted. Perhaps a subject line can be included in the email body, and replaced with message number in the subject line. The recipient would receive a message number. Say for example 1542175246. On the Protonmail side, 1542175246 is translated to Financial Document.

    Maybe the subject line can be hashed. Ideas? Comments?

    LPS supported this idea  · 

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