Patent ID: 9606810
Date: 2017-03-28
CPC Classifications: G06F,H04L

Claim:
1. A method for replacing a first operating system software of a limited-resource portable data carrier at a terminal, the method comprising the steps of: providing a new operating system software in the terminal; providing a first bootstrap loader, the first bootstrap loader being configured to load the new operating system software in the data carrier; providing a terminal certificate in the terminal, which proves authorization for the terminal to transmit a loading key; transmitting the terminal certificate to the data carrier within a framework of an authentication protocol; verifying the terminal certificate by the data carrier; transmitting the loading key to the data carrier; transferring operational control of the data carrier to the first bootstrap loader; deleting the first operating system software of the data carrier by the first bootstrap loader; transmitting the new operating system software to the data carrier using the loading key; activating the new operating system software by the first bootstrap loader; transferring the operational control of the data carrier from the first bootstrap loader to the new operating system software.