Niklas Büscher

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With excellent short-term survival in liver transplantation (LT), we now focus on long-term outcome and report the first European single-center 20-year survival data. Three hundred thirty-seven LT were performed in 313 patients (09/88-12/92). Impact on long-term outcome was studied and a comparison to life expectancy of matched normal population was(More)
CAPTCHAs are small puzzles which should be easily solv-able by human beings but hard to solve for computers. They build a security cornerstone of the modern Internet service landscape, deployed in essentially any kind of login service, allowing to distinguish authorized human beings from automated attacks. One of the most popular and successful systems(More)
Secure two-party computation (TPC) based on Yao's garbled circuits has seen a lot of progress over the past decade. Yet, compared with generic computation, TPC is still multiple orders of magnitude slower. To improve the efficiency of secure computation based on Yao's protocol, we propose a practical parallelization scheme. Its advances over existing(More)
Practical hardness results are necessary to select parameters for cryptographic schemes. Cryptographic challenges proved to be useful for determining the practical hardness of computational problems that are used to build public-key cryptography. However, several of these problems have the drawback that it is not known how to create a challenge for them(More)
OBJECTIVES The influence of donor-recipient sex mismatches on long-term graft survival after liver transplant is controversial. In this study, our aim was to characterize the differences in long-term graft outcome after liver transplant in more than 2000 cases with special regard to sex match and mismatch. MATERIALS AND METHODS In this retrospective,(More)
Interconnected embedded devices are increasingly used in various scenarios, including industrial control, building automation , or emergency communication. As these systems commonly process sensitive information or perform safety critical tasks, they become appealing targets for cyber attacks. A promising technique to remotely verify the safe and secure(More)
AIM To characterize major determinants of 20-year survival after liver transplantation (LT). METHODS This longitudinal single-institution study includes 313 consecutive patients who received a LT between 1988 and 1992. Pretransplant clinical characteristics and laboratory values were assessed and compared between 20-year survivors and non-survivors.(More)
With Secure Multi-party Computation (MPC) becoming more and more practical, tools for automatized application development become of importance. Therefore, multiple compilers have been developed that translate high-level functionality descriptions into Boolean circuits, optimized for their use in MPC protocols. Previous efforts in compiler development for(More)
OBJECTIVES Iloprost has the potential to protect the liver transplant graft before and during cold ischemia. We studied iloprost administration during organ procurement and reperfusion in an extracorporeal pig liver perfusion model. MATERIALS AND METHODS German Landrace pigs (n = 7/group; 22-26 kg each) were used as donors. Preservation was performed by(More)