Systems and methods for enabling user authentication using a first computing device (e.g., a tablet computer) for providing user credentials including an obfuscated password to an application server for authenticating the user credentials and a second computing device different from the first computing device (e.g., a mobile phone) for generating the obfuscated password are described. In some cases, the first computing device may request a login page for accessing a protected resource (e.g., an electronic file) from the application server, which may generate a user specific grid for the login page and send the login page including the user specific grid to the first computing device. The user specific grid may include a plurality of symbols (e.g., alphanumeric characters) associated with a password. The second computing device may generate the obfuscated password using the plurality of symbols entered by a user of the second computing device.