The E2EE email plug-in is being targeted at enterprise users - which means Tresorit us not competing directly with E2E webmail provider ProtonMail which is focused on consumers or smaller businesses.
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“The original sender receives an email about the reply but as s/he has a Tresorit account and installed plugin it enables us to download the content of the reply from our servers, decrypt it locally and display it to the sender in their email client in a secure and transparent way,” the spokeswoman adds. A recipient who’s not a Tresorit subscriber can also send an E2EE reply via an editor in the same browser - by clicking on the “Secure reply” option in the body of the E2EE email they received from the Tresorit user.
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“Currently, we use email validation as a security guarantee (we are sending a code to the email address that the user has to paste into the Tresorit website in the browser), and we are planning to add new methods (password provided by the sender, authentication with public SSO providers),” she adds.
By clicking on the link, the recipient can access the decrypted email content in the browser after certain security checks that prevent the email service provider to intercept the content.” “If someone without a Tresorit account receives an email sent with our email encryption service, s/he receives an encrypted email template with a reference/link to the end-to-end encrypted content (this is similar to our file sharing service Send).
As opposed to E2EE email services, this enables E2EE communication even with a recipient who doesn’t have a Tresorit account. “This ensures that reply emails are end-to-end encrypted even when sent by someone who doesn’t have a Tresorit account. “This is possible because replies are encrypted in the sender’s browser,” explains the spokeswoman. Email users who are not themselves Tresorit subscribers themselves but want to send an E2EE email reply to an E2EE email sent via Tresorit are able to do so without needing to have an account. This means, no one besides the sender and the recipient is able to read them,” she told us. “All emails and attachments sent with Tresorit’s email encryption as well as the replies sent to these (regardless of whether the sender of the reply has a Tresorit account or not) will be end-to-end encrypted with the encryption technology used in Tresorit’s cloud storage and file-sharing app. An Outlook user can access the function by clicking on the “Email Encryption” button that’s displayed in the top left corner, per a spokeswoman. From launch it’s available for Microsoft Outlook but further integrations are planned, including with Gmail. How does the tool work? The Tresorit account holder downloads and installs the plug-in which integrates with their existing email client.
Tresorit’s E2EE module enables subscribers to send and receive strongly encrypted email messages via their usual email provider - with the level of security enhanced as the plug-in is wrapped in the same zero-knowledge promise Tresorit claims for its file storage and sharing products.
Swiss-Hungarian end-to-end encrypted cloud services provider Tresorit has added a new string to its security bow: It’s started offering E2E encrypted email as a subscription add-on for business users of third party email service providers.
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Tresorit bolts on E2E email via a plug-in for enterprise software
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