Infineon Technologies Ag

Patrick Kresmer

Alexander Zeh

Andreas Graefe

The described techniques address issues associated with current secure in-vehicle communication systems, which are required to generate subkeys per each encoded data transmission/reception. These encoded data transmissions/receptions may be in accordance with several different in-vehicle communication protocols, and the requirement of such protocols to generate the subkeys 'on-the-fly' may lead to significant processing overhead and latency. The embodiments provided herein address the issue of subkey generation by using a predetermined function to pre-calculate and store the subkeys that are to be used for future encoded data message transmissions/receptions. In this way, the time and overhead required to generate the subkeys may be better and more efficiently managed.

Secure communications using pre-generated subkeys

A system may include a plurality of matching block cipher devices, and a hardware state machine communicatively coupled to each of the plurality of matching block cipher devices. Each of the plurality of matching block cipher devices can be independently invoked by the hardware state machine such that the hardware state machine causes two or more of the plurality of matching block cipher devices to selectively perform a block-cipher-based symmetric cryptographic operation in a redundant mode or a parallel mode. The block-cipher-based symmetric cryptographic operation may be associated with securing a communication channel of an automotive system.

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Munich, Germany

Patrick Kresmer