Delegatable Functional Signatures

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Provided by: International Association for Cryptologic Research
Topic: Security
Format: PDF
Digital signature schemes resemble the idea of a hand written signature in the sense that a signer signs messages with their private key sksig and anybody can check the validity of the signature using the corresponding public key pksig. The authors introduce Delegatable Functional Signatures (DFS) which support the delegation of signing capabilities to another party, called the evaluator, with respect to a functionality F. In a DFS, the signer of a message can choose an evaluator, specify how the evaluator can modify the signature without voiding its validity, allow additional input and decide how the evaluator can further delegate its capabilities.
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