US Patent 10193700 Trust-zone-based end-to-end security

Methods, electronic devices, and systems for exchanging encrypted information. A method for exchanging encrypted information by an electronic device includes generating one or more device certificates and one or more device public private key pairs. The one or more device certificates are signed using a device unique private key that is pre-stored on the electronic device. The method also includes sending the one or more device certificates to a server of a token service provider (TSP). The method further includes receiving one or more TSP certificates from the TSP server. The method includes identifying one or more TSP public keys of the TSP server based on the one or more received TSP certificates. Additionally, the method includes transmitting a message including the information encrypted based on the one or more identified TSP public keys and a signature of the electronic device.