Description
Embedded devices face software and physical fault injections to either extract or tamper with code in memory. The code execution and code intellectual property are threatened. Some existing countermeasures provide Control Flow Integrity (CFI) extended with the confidentiality and integrity of the instructions by chaining all of them through a cryptographic encryption primitive. While tampering with instructions in memory is prevented, fault injection attacks can still target the microarchitecture. In this talk, we introduce a new chained instruction encryption scheme with associated control signals, to provide additional authenticity and integrity properties down to the control signals of the microarchitecture’s pipeline. The instructions are stored encrypted in memory. At runtime, prior to being executed, the fetched instructions are decrypted depending on the control signals in the pipeline and all the previously decrypted instructions. In case of fault injections, targeting either instructions or control signals, the decryption process fails and generates random instructions, instead of the original ones. This quickly leads to an invalid instruction exception: the fault attack is thwarted. Our scheme was implemented on FPGA, into the 4-stage pipeline of the RISC-V cv32e40p core, using Ascon for encryption/decryption.
Infos pratiques
Prochains exposés
-
PhaseSCA: Exploiting Phase-Modulated Emanations in Side Channels
Orateur : Pierre Ayoub - LAAS-CNRS
In recent years, the limits of electromagnetic side-channel attacks have been significantly expanded.However, while there is a growing literature on increasing attack distance or performance, the discovery of new phenomenons about compromising electromagnetic emanations remains limited. In this work, we identify a novel form of modulation produced by unintentional electromagnetic emanations: phase[…]-
Side-channel
-
-
Conformité TEMPEST et compromission d’information au travers de l’arbre d’alimentation d’un équipement
Orateur : Tristan PECHERAU, David HARDY - Thalès
THALES conçoit des équipements cryptographiques et de radiocommunication tactiques, navales et aéronautiques, embarquant des éléments de chiffrement pour la sécurité des communications. Cette sécurité notamment d’un point de vue des émanations électromagnétiques est normée. Ces normes de sécurité de l’information, sont connues sous le nom de code “TEMPEST”, correspondant aux normes OTAN SDIP-27,[…] -
Prise de contrôle d’un infodivertissement automobile à distance
Orateur : Philippe Trebuchet, Guillaume Bouffard - ANSSI
Les véhicules connectés intègrent de nombreuses technologies de communications sans-fil à distance, comme celles exploitant les protocoles Bluetooth ou WiFi. Si le gain en confort d’utilisation et d’interaction est notable, la mise à disposition de ce type d’interfaces augmente les risques en matière de cybersécurité. Dans cet article, nous analysons l’implémentation de la pile Bluetooth embarquée[…]-
SemSecuElec
-
Network
-
Embedded systems
-