To ensure that an electronic device is a secure electronic device, a communication device transmits a request to authenticate the electronic device to a remote electronic device across a network. The communication device receives a security challenge. One or more processors of the electronic device obtain a response to the security challenge using a secret key stored in an encrypted memory of the electronic device. The communication device then transmits the response to the response to the security challenge to the remote electronic device. If the remote electronic device recognizes the response, it transmits a shared secret content marker, which can optionally be presented at a user interface of the electronic device. The request can be automatically initiated by a companion electronic device.