Warrant-Hiding Delegation-by-Certificate Proxy Signature Schemes

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Provided by: Graz University of Technology
Topic: Security
Format: PDF
Proxy signatures allow an entity (the delegator) to delegate the user signing capabilities to other entities (called proxies), who can then produce signatures on behalf of the delegator. Typically, a delegator may not want to give a proxy the power to sign any message on their behalf, but only messages from a well defined message space. Therefore, the so called delegation by warrant approach has been introduced. Here, a warrant is included into the delegator's signature (the so called certificate) to describe the message space from which a proxy is allowed to choose messages to produce valid signatures for.
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