Blank Digital Signatures

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Provided by: Graz University of Technology
Topic: Security
Format: PDF
In this paper the authors present a novel type of digital signatures, which they call blank digital signatures. The basic idea behind this scheme is that an originator can define and sign a message template, describing fixed parts of a message as well as multiple choices for exchangeable parts of a message. One may think of a form with blank fields, where for such fields the originator specifies all the allowed strings to choose from. Then, a proxy is given the power to sign an instantiation of the template signed by the originator by using some secret information.
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