Box allows you to password protect shared links, requiring the people accessing the link to enter the set password to access the file or folder. This is a premium feature which is unavailable on free personal accounts.
Note: Old Box Experience
This page refers to the old Box experience. In Box, hover over a single file or folder with your mouse. If the item looks like the following image, you are in the right place.
If the item does not look like the image above, visit one of the links below instead:
To use this feature, first generate a shared link by clicking Share to the right of your file, or from the More Options (...) menu (... > Sharing > Share Link). This will open a pop-up window with your shared link. Click the Advanced Settings gear icon in the top right. You must also have the shared link set to "People with the Link" before accessing the Advanced Settings for the password protection option to appear.
On the pop-up window, under the "Advanced" settings, check the box marked "Require Password." Set a password, then click Save to save your share link settings.