Cristian Marinescu

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This work has been submitted to the IEEE for possible publication. Copyright may be transferred without notice, after which this version may no longer be accessible Notice: Changes introduced as a result of publishing processes such as copy-editing and formatting may not be reflected in this document. For a definitive version of this work, please refer to(More)
Authentication, non-repudiation, and digital signatures, require the ability to determine if a data token existed at a certain moment in time when the creator's credentials were valid. Time-stamps are tokens which contain a verifiable cryptographic link between a time value and a data representation. The paper presents some critical aspects of the X.509(More)
Eines der größten Probleme, mit denen digitale Beweisstückeu nd Doku-mente konfrontiert werden, ist das Feststellen der exakten Herstellungszeit. Viele Si-cherheitsdienste bauen auf der F ¨ ahigkeit auf, die Zeit verschiedener Operationen fest-stellen zu k ¨ onnen. Einfache, verknüpfte und verteilte Schemen sind die heute ver-breitetsten Methoden digitale(More)
In this paper we discuss scheduling on a computational grid of autonomous nodes. A two level process involves a meta-scheduler whose objective is to generate an optimal schedule and reduce the total execution time of an work-ow, and local schedulers whose objective is to optimize the utilization of local resources. We introduce several resource allocation(More)
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