Secrets transfer method, by exchange of two certifiers between two microcomputers, authenticating one another

摘要

According to the invention, the chip card sends out a first certificate grouping together its credentials (Crc), an exponential (X), an optional message (M), these quantities being signed. The safety module checks the signature and sends back by return a second certificate containing its credentials (Crm), an exponential (Y), an optional message (M'), a cryptogram (C), these quantities being signed. A common, secret key is constituted between the card and the safety module by the exponentials and permits the card to interpret the cryptogram which is addressed to it and to act in consequence. Application to chip cards.