Upwork takes commercially reasonable steps to help protect and secure the information it collects and stores about Upwork Users. All access to the Site is encrypted using industry-standard transport layer security technology (TLS). When you enter sensitive information (such as tax identification number), we encrypt the transmission of that information using secure socket layer technology (SSL). We also use HTTP strict transport security to add an additional layer of protection for our Upwork Users. You may refer to our Privacy Policy here for more information.