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We introduce the concept of Logically Reconfigurable Physical Unclonable Functions (LR-PUFs). In contrast to classical Physically Unclonable Functions (PUFs), LR-PUFs can be dynamically 'reconfigured' after deployment such that their challenge/response behavior changes in a random manner , i.e., without replacing or physically modifying the PUF. To this(More)
Physically Unclonable Functions (PUFs) are an emerging technology and have been proposed as central building blocks in a variety of cryptographic protocols and security architectures. However, the security features of PUFs are still under investigation: Evaluation results in the literature are difficult to compare due to varying test conditions, different(More)
RFID-based tokens are increasingly used in electronic payment and ticketing systems for mutual authentication of tickets and terminals. These systems typically use cost-effective tokens without expensive hardware protection mechanisms and are exposed to hardware attacks that copy and maliciously modify tokens. Physically Unclonable Functions (PUFs) are a(More)
Today, large numbers of smart interconnected devices provide safety and security critical services for energy grids, industrial control systems, gas and oil search robots, home/office automation, transportation, and critical infrastructure. These devices often operate in swarms -- large, dynamic, and self-organizing networks. Software integrity verification(More)
Today, embedded, mobile, and cyberphysical systems are ubiquitous and used in many applications, from industrial control systems, modern vehicles, to critical infrastructure. Current trends and initiatives, such as "Industrie 4.0" and Internet of Things (IoT), promise innovative business models and novel user experiences through strong connectivity and(More)
The Trusted Computing Group (TCG) has addressed a new generation of computing platforms employing both supplemental hardware and software with the primary goal to improve the security and the trustworthiness of future IT systems. The core component of the TCG proposal is the Trusted Platform Module (TPM) providing certain cryptographic functions. Many(More)
Recently, operators of public transportation in many countries started to roll out electronic tickets (e-tickets). E-tickets offer several advantages to transit enterprises as well as to their customers, e.g., they aggravate forgeries by cryptographic means whereas customers benefit from fast and convenient verification of tickets or replacement of lost(More)
Remote attestation is a mechanism to securely and verifiably obtain information about the state of a remote computing platform. However, resource-constrained embedded devices cannot afford trusted hardware components to attest the device, while plain software attestation is generally vulnerable to network and collusion attacks. In this paper, we present a(More)