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XML Encryption and XML Signature are fundamental security standards forming the core for many applications which require to process XML-based data. Due to the increased usage of XML in distributed systems and platforms such as in SOA and Cloud settings, the demand for robust and effective security mechanisms increased as well. Recent research work discovered, however, substantial vulnerabilities in these standards as well as in the vast majority of the available implementations. Amongst them, the so-called XML Signature Wrapping attack belongs to the most relevant ones. With the many possible instances of this attack type, it is feasible to annul security systems relying on XML Signature and to gain access to protected resources as has been successfully demonstrated lately for various Cloud infrastructures and services. This paper contributes a comprehensive approach to robust and effective XML Signatures for SOAP-based Web Services. An architecture is proposed, which integrates the r equired enhancements to ensure a fail-safe and robust signature generation and verification. Following this architecture, a hardened XML Signature library has been implemented. The obtained evaluation results show that the developed concept and library provide the targeted robustness against all kinds of known XML Signature Wrapping attacks. Furthermore the empirical results underline, that these security merits are obtained at low efficiency and performance costs as well as remain compliant with the underlying standards.
Gute Reha ist mehr als reine Krankenbehandlung - Zur Reha-Qualitätssicherung im Sinne der Patienten
(2012)
Development and Validation of a Rapid and Reliable Method for TPMT Genotyping using real-time PCR
(2012)
3D Time-of-Flight (ToF)
(2012)
Lichtlaufzeitsensor
(2012)
Lichtlaufzeitkamera
(2012)
The documentation requirements of data published in long term archives have significantly grown over the last decade. At WDCC the data publishing process is assisted by “Atarrabi”, a web-based workflow system for reviewing and editing metadata information by the data authors and the publication agent. The system ensures high metadata quality for long-term use of the data with persistent identifiers (DOI/URN). By these well-defined references (DOI) credit can properly be given to the data producers in any publication.
In this paper we summarize our research on international educational contexts and transfer the results to the context of urban life-long learning. We will show that a collection and provision of relevant data can help instructors as well as learners to raise their awareness regarding contextual differences, to develop a higher level of acceptance regarding differences, and thus, in the long term, avoid frustration in educational processes and reduce drop out-rates.
In the context of Internet-based e-Learning, including an international auditory is a logical consequence. However, due to uncertainty regarding the foreign learners, e-Learning programs often are limited to local or national participants. Understanding the different expectations of learners regarding instructor-support is one step in order to enable providers of educational services to tailor educational programs that fit the requirements of an international auditory. We asked university students in five countries regarding their expectations towards instructor-support and found major differences between the investigated countries.
For learners, feedback can be both, a strong motivator but in case it fails its purpose, it can be a strong reason for frustration and dropouts as well. Do we have to change our locally implemented feedback strategies when adapting learning contents from national to international settings? In our study, we the investigated learners’ understanding and preferences regarding feedback in scenarios of higher education across the five different national contexts, Bulgaria, Germany, South Korea, Turkey, and Ukraine.
This presentation shows that students in different cultural contexts have different perceptions of time management and work organization. Particularly in group work scenarios, such differences can have a frustrating impact on students from other cultural contexts because e.g., expectations are not met. Being aware of such differences between the learners in a culturally heterogeneous educational scenario, educators can prevent frustration by introducing their students and providing more specific instructions.
Education is widely seen as an important means of addressing both national and international problems, such as political or religious extremism, poverty, and hunger. If publicly available educational resources (OERs) shall help overcoming the educational gap, localization is one of the major issues we need to deal with. Educators as well as learners need to be supported to determine adaptation needs. This paper provides a list of possible in-fluence factors on educational scenarios which are defined as context metadata. In the given form, the list needs to be understood as an addendum for the paper entitled ‘Open Educational Resources: Education for the World?’ from Thomas richter and Maggie McPherson; It is being published in the volume 3, issue 2 of the Journal Distance Education in 2012.
Education is widely seen as an important means of addressing both national and international problems, such as political or religious extremism, poverty, and hunger. However, if developing countries are to become societies that can compete properly with Western industrialized countries, not only is a fundamental shift in thinking with regard to the value of education and more/better provision of teaching required, but strong support from other countries is needed as well. This article explores questions such as whether Western policymakers can avoid a repetition of some of the failures of the past few decades in terms of providing foreign aid; how educators and providers of educational scenarios and learning contents can foster and manage the creation of a worldwide knowledge society; and in particular, if the provision of open educational resources (OER) can realistically overcome the educational gap and foster educational justice.
Disorders of the degradation of branched chain amino acids: what is new in clinics and laboratories?
(2012)
Molybdenum cofactor deficiency (MoCD) is a rare inherited metabolic disorder characterized by severe and progressive neurological damage mainly caused by the loss of sulfite oxidase activity. Elevated urinary levels of sulfite, thiosulfate, and S-sulfocysteine (SSC) are hallmarks in the diagnosis of MoCD and sulfite oxidase deficiency (SOD). Recently, a first successful treatment of a human MoCD type A patient based on a substitution therapy with the molybdenum cofactor precursor cPMP has been reported, resulting in nearly complete normalization of MoCD biomarkers. Knowing the rapid progression of the disease symptoms in nontreated patients, an early diagnosis of MoCD as well as a sensitive method to monitor daily changes in SSC levels, a key marker of sulfite toxicity, is crucial for treatment outcome. Here, we describe a fast and sensitive method for the analysis of SSC in human urine samples using high performance liquid chromatography (HPLC). The analysis is based on precolumn derivatization with O-phthaldialdehyde (OPA) and separation on a C18 reverse phase column coupled to UV detection. The method was extended to human serum analysis and no interference with endogenous amino acids was found. Finally, SSC values from 45 pediatric urine, 75 adult urine, and 24 serum samples from control individuals as well as MoCD patients are reported. Our method represents a cost-effective technique for routine diagnosis of MoCD and SOD, and can be used also to monitor treatment efficiency in those sulfite toxicity disorders on a daily basis.