How does Tutanota's secure search of encrypted data work? Tutanota a competitor, claims to be the "first to enable search on encrypted data" However I'd add the asterisk, the first cloud email service to provide encrypted search, message body included, without requiring an application be installed locally and not to mention not every email has to be decrypted (as would occur with ProtonMail Bridge). Another way to think of it is that the ProtonMail Bridge translates end-to-end encrypted email data into a language that any email client can understand, thus “bridging” the gap between ProtonMail’s end-to-end encryption and your standard email client. In this way, standard email clients which do not natively support end-to-end encryption can support encryption without modification. The Bridge communicates with ProtonMail’s encrypted email server via our API, which supports end-to-end encryption, while email clients can communicate directly with the Bridge via standard IMAP and SMTP. As a result, all encryption and decryption occur locally and thus the benefits of end-to-end encryption remain. The Bridge essentially acts like a local email server (using the IMAP and SMTP protocols) and interacts with email clients also installed locally on your desktop computer. Essentially, it's a little local email server on your local computer that is a bridge between local email applications: Outlook, Thunderbird or Applemail and the ProtonMail servers. Since the end of 2017 ProtonMail has also delivered a product called ProtonMail Bridge. However, on apps that run locally it can locally decrypt your emails and fully search them locally. ProtonMail does not offer searching message body of emails in its cloud service, but on its mobile apps and as the Benoit Esnard points out.
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