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Legal security for transformations of signed documents: Fundamental concepts

: Schmidt, A.U.; Loebl, Z.

Chadwick, D.:
Public key infrastructure: Second European PKI Workshop: Research and Applications, EuroPKI 2005 : Canterbury, UK, June 30 - July 1, 2005. Revised selected papers
Berlin: Springer, 2005 (Lecture Notes in Computer Science 3545)
ISBN: 3-540-28062-6
European Workshop Public Key Infrastructure (EuroPKI) <2, 2005, Canterbury>
Conference Paper
Fraunhofer SIT ()
digital signature; legal and social aspects; E-Commerce; telecooperation

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.