Delegatable functional signatures

Buch (Autor)
(Band aus einer Reihe)

Details zur Publikation

Autor(en): Backes M, Meiser S, Schröder D
Verlag: Springer Verlag
Jahr der Veröffentlichung: 2016
Titel der Reihe: Public-Key Cryptography - PKC 2016
Band: 9614
Seitenbereich: 357-386
ISBN: 9783662493830


We 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. Technically, DFS unify several seemingly different signature primitives, including functional signatures and policy-based signatures (PKC’14), sanitizable signatures, identity based signatures, and blind signatures. We characterize the instantiability of DFS with respect to the corresponding security notions of unforgeability and privacy. On the positive side we show that privacy-free DFS can be constructed from one-way functions. Furthermore, we show that unforgeable and private DFS can be constructed from doubly-enhanced trapdoor permutations. On the negative side we show that the previous result is optimal regarding its underlying assumptions presenting an impossibility result for unforgeable private DFS from one-way permutations.

FAU-Autoren / FAU-Herausgeber

Schröder, Dominique Prof. Dr.
Lehrstuhl für Informatik 13 (Angewandte Kryptographie)


Backes, M., Meiser, S., & Schröder, D. (2016). Delegatable functional signatures. Springer Verlag.

Backes, Michael, Sebastian Meiser, and Dominique Schröder. Delegatable functional signatures. Springer Verlag, 2016.


Zuletzt aktualisiert 2018-13-11 um 20:50