## KeLiPUF: a key-distribution protocol for lightweight devices using Physical Unclonable Functions

• Physical Unclonable Functions (PUFs) allow securely reproducing keys from variations of physical properties of a device. This work presents a new protocol for key-distribution based on such PUFs. The protocol utilizes the fact that multiple keys can be derived from certain PUF types. Similar to the Kerberos protocol, a trusted third party determines the key to be used for secure communication of devices in a network. KeLiPUF focuses on lightweight applications like they appear in in-car communications. The protocol is analyzed regarding possible threats and countermeasures for weaknesses. The dependence of the security level on the PUF’s quality as well as on other used components is discussed. A sample hardware implementation on FPGA shows the efficiency and applicability of the protocol.

Author: Michael PehlGND, Christoph FrischGND, Peter Christian FeistGND, Georg SiglGND urn:nbn:de:hbz:294-66768 https://doi.org/10.13154/294-6676 17$$^{th}$$ escar Europe : embedded security in cars (Konferenzveröffentlichung) Part of a Book English 2019/10/31 2019/10/31 Ruhr-Universität Bochum, Universitätsbibliothek Kerberos; Key Distribution; Physical Unclonable Functions; Protocol; Security Analysis 200 214 Allgemeines, Informatik, Informationswissenschaft / Informatik open_access 17th escar Europe : embedded security in cars Keine Creative Commons Lizenz - es gelten die Rechteeinräumung und das deutsche Urheberrecht