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Auflistung nach Autor:in "Graffi, Kalman"

1 - 2 von 2
  • Konferenzbeitrag
    Towards a biometric random number generator – a general approach for true random extraction from biometric samples
    (BIOSIG 2011 – Proceedings of the Biometrics Special Interest Group, 2011) Hartung, Daniel; Wold, Knut; Graffi, Kalman; Petrovic, Slobodan
    Biometric systems are per definition used to identify individuals or verify an identity claim - one difficulty of getting reliable decisions is the inherent noise that makes it difficult to extract stable features from biometric data. This paper describes how biometric samples can be used to generate strong random numbers which form the basis of many security protocols. Independent from the biometric modality, the only requirement of the proposed solution are feature vectors of fixed length and structure. Each element of such a feature vector is analyzed for its reliability - only unreliable positions, that cannot be reproduced coherently from one source, are extracted as bits to form the final random bit sequences. Optionally a strong hash-based random extraction can be used. The practicability is shown testing vascular patterns against the NIST-recommended test suite for random number generators.
  • Konferenzbeitrag
    Traceability link evolution with version control
    (Software Engineering 2011 – Workshopband, 2011) Mukherjee, Patrick; Saller, Karsten; Kovacevic, Aleksandra; Graffi, Kalman; Schürr, Andy; Steinmetz, Ralf
    Traceability links enable the possibility to trace the evolution of a project from the earliest requirements engineering phase over the design and implementation to the test phases of a project. Having a link between the artifacts resulting from these phases, a requirement can be traced to, e.g., the test report, which tested the code implementing the requirement. However, as the artifacts evolve into new versions the traceability links between these artifacts evolve as well. Concurrent work on the artifacts might result in conflicts which reflects in conflicting versions of the traceability links. Often the artifacts created in different phases of a development process are stored in different repositories. In this paper we present a version control system capable of controlling the evolutionary changes of traceability links which connect artifacts residing in different repositories and resolve the conflicts caused by concurrent work on artifacts.