This document explains how to use the Gmail encryption feature in Nightfall to send encrypted emails. This document explains all the options available to the sender.
To use Nightfall Gmail encryption to send emails:
Login to your Gmail account from the same browser on which the Nightfall extension is enabled.
Click Compose to start a new email.
You can see that the Nightfall encryption toggle switch called Encrypt with Nightfall AI is now available. You must enable this toggle switch to activate the Gmail encryption feature.
Once you enable this toggle switch, you can view the encryption options which are explained in the following section.
This section describes the various email encryption options provided by Nightfall.
With this option, recipients can only read your emails. They cannot forward the emails further if you enable this option before sending the email. However, recipients can reply to the email. while replying to the email, recipients cannot add additional recipients to their response, if they do not have the Nightfall DLP Browser extension. When an Email is sent to multiple users with the Disable Forwarding option enabled, each recipient can choose to either just Reply to the email or Reply all.
To view the sender experience, click the #disable-forwarding-when-nightfall-dlp-is-not-installed or #disable-forwarding-when-nightfall-dlp-is-installed documents.
You can use this option to set an expiration period for the email. The email expires after the set period and is inaccessible to the recipient. You can set the expiration period in Hours, Weeks, Days, or months. Nightfall displays the exact date and time when you set the expiration time. After the set period the recipient cannot access the email.
Once you set the expiration timeline, Nightfall calculates and displays the exact date and time after which the email cannot be accessed by the recipient. You can modify the expiration period, if required.
Once the email expires, the sender can choose to extend the expiration of the email. In this case, the recipient can view the email again until the next expiration date. The sender can also choose to disable the expiration feature totally. In this case, the recipient always has the access to the email, unless the sender enables the expiration feature again and sets an expiry date.
To view the recipient experience, refer to the #email-expiry-when-nightfall-dlp-is-installed or the #email-expiry-when-nightfall-dlp-is-not-installed documents.
The persistent protection feature allows you to protect the attachments sent in an email which is encrypted by Nightfall. With persistent protection, Nightfall disables the options to download, copy, or forward attachments included in an email which is securely encrypted by Nightfall. Recipients can only view the contents of the attachments through a secure reader.
Currently, Persistent protection works with attachments with the following extensions. pdf, jpg, jpeg, png, tiff, heic, gif, webp, svg, tga, eps, doc, docx, xls, xlsx, ppt, pps, pptx, ppsx, rtf, odt, and html.
The maximum file size can be 25 MB.
You can use this option to notify the recipient that this is an encrypted email. The content drafted in the Introduction section is not encrypted. To enable the Introduction section, click Introduction.
Only the content below the horizontal line is encrypted.
Once you send an encrypted email, you can view it from the Sent section of your Gmail. The email looks as shown in the following image.
