US Patent 11461480 Synchronizing private data with reduced trust

System and methods for synchronizing and encrypting profile information are provided. A method establishes a first browser instance on a first virtual machine being in communication with a first browser profile sync and encrypt agent. The method also establishes a second browser instance on a second virtual machine. The method may use the first browser profile sync and encrypt agent acting through a profile helper service to encrypt profile changes involving the first browser instance on an encrypted master profile and use the second browser profile sync and encrypt agent acting through the profile helper service to encrypt profile changes involving the second browser instance on the encrypted master profile. The method maintains a browser profile persistence for the first browser instance and for the second browser instance, using the encrypted master profile, on a single on-disk profile.