Legal Security for Transformations of Signed Documents: Fundamental Concepts

  • Andreas U. Schmidt
  • Zbyněk Loebl
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3545)


Transformations of signed documents raise questions of technical and organisational nature which render the legal security of the transformed document doubtful. In particular, digital signatures of originals break depriving documents of probative force. This report elucidates legal problems, and introduces fundamental concepts of legally secure document transformations in a deliberately generic, application-independent way. A process analysis of transformations of signed documents is carried out to elicit common security requirements. This leads to the solution approach transformation seal, a cryptographically secured container used to ensure legal security for transformed documents by securing the content’s integrity, attesting a transformation’s correctnes, and attributing it to a responsible party.


Electronic Signature Civil Code Electronic Document Data Message Paper Document 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2005

Authors and Affiliations

  • Andreas U. Schmidt
    • 1
  • Zbyněk Loebl
    • 2
  1. 1.Fraunhofer Institute for Secure Information Technology SITDarmstadtGermany
  2. 2.Central European Advisory GroupPrague 1Czech Republic

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