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Over the past years Mobile Business has gained significant progress not only because of higher transfer rates as well as advanced processing power and memory capabilities of networks and mobile devices but also because of novel location-based mobile applications which raise many expectations in the mobile market. As a result network operators start to offer(More)
In this paper we present and discuss a new approach for securing mul-timedia communication, which is based on three innovations. The first innovation is the integration of a challenge-response scheme for enhancing the Diffie-Hellman based ZRTP protocol. When being called, a callee must present the result of a computational puzzle (a " token ") within a(More)
ZRTP is a protocol designed to set up a shared secret between two communication parties which is subsequently used to secure the media stream (i.e. the audio data) of a VoIP connection. It uses Diffie-Hellman (DH) key exchange to agree upon a session key, which is inherently vulnerable to active Man-in-the-Middle (MitM) attacks. Therefore ZRTP introduces(More)
Network Operators start to offer formerly hidden services such as location service, messaging services and presence services. This fosters the development of a new class of innovative context aware applications that are operated by third party application providers. However, without the implementation of proper privacy protection mechanisms, location and(More)
Third party service providers are starting to use advanced location services based on area or periodical notification in order to develop innovative applications. However, such functions can be easily misused for tracking users and building their activity profiles, if privacy enhancement mechanisms are not integrated into the service architecture. In this(More)
Epoxyeicotrienoic acids (EETs) are cytochrome P450-dependent anti-hypertensive and anti-inflammatory derivatives of arachidonic acid, which are highly abundant in the kidney and considered reno-protective. EETs are degraded by the enzyme soluble epoxide hydrolase (sEH) and sEH inhibitors are considered treatment for chronic renal failure (CRF). We(More)
The pathogenesis and therapy of Shigatoxin 2 (Stx2)-mediated kidney failure remain controversial. Our aim was to test whether, during an infection with Stx2-producing E. coli (STEC), Stx2 exerts direct effects on renal tubular epithelium and thereby possibly contributes to acute renal failure. Mice represent a suitable model because they, like humans,(More)