Facebook, Inc.

Simon A Blackstein

Erling Alf Ellingsen

Itay Duvdevani

Oren Hafif

In one embodiment, a method includes sending a login request to a server computing device; receiving a first derivative identifier from the server computing device; storing the first derivative identifier; sending a content request to the server computing device for a web page; receiving, from the server computing device, a content frame and a trusted frame for display on the client device, wherein the content frame comprises a second derivative identifier; according to instructions associated with the content frame, requesting the trusted frame to verify whether the second derivative identifier matches the first derivative identifier; according to instructions associated with the trusted frame, verifying whether the second derivative identifier matches the stored first derivative identifier; and displaying the requested web page in the content frame based on a verification confirmation from the trusted frame that the second derivative identifier matches the stored first derivative identifier.

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San Francisco, CA, United States of America

Simon A Blackstein