Individual file attachments can be encrypted using the Encrypt command from the attachment context menu.
AES 256 bit encryption ensures that without the password, it is impossible to recover the file contents from the encrypted file - even with administrator access to the machine where the file is stored on a local computer or remote cloud server.
Encrypted files cannot be searched and can only be decrypted via Windows and macOS versions of TheBrain. These files are completely inaccessible even to your hosting provider whether that be a private TeamBrain Enterprise Server or TheBrain Technologies Cloud Server.
To find all the encrypted files in your brain, simply search for the encrypted file extension: .brenc ~ Alternatively, you could also create a tag to attach to thoughts with encrypted files. (This will allow you to view and access all of these thoughts, and their encrypted attachments, in one location within the plex.)