A method for providing online security may include: (1) receiving, by a validation computer program executed by a trusted entity backend for a trusted entity, a call from a web browser executed on a customer electronic device browsing a webpage for an online entity, the call comprising an online entity identifier for the online entity and a session identifier, wherein the webpage for the online entity may include a hidden comprising code that causes the web browser to execute the call; (2) confirming, by the validation computer program, that a cookie for the trusted entity may be stored on the customer electronic device; and (3) returning, by the validation computer program, a first value indicating that the customer electronic device is known to the trusted entity or a second value indicating that the customer electronic device is not known to the trusted entity based on the confirmation.