Paper 2021/639

Indifferentiable Signatures: High Performance and Fallback Security

Charalampos Papamanthou, Cong Zhang, and Hong-Sheng Zhou


Digital signatures have been widely used as building blocks for constructing complex cryptosystems. To facilitate the security analysis of a complex system, we expect the underlying building blocks to achieve desirable composability. Notably, Canetti (FOCS 2001) and then Maurer et al (TCC 2004) propose analysis frameworks, the Universal Composability framework for cryptographic protocols, and the indifferentiability framework for cryptographic objects. In this paper, we develop a “lifting strategy”, which allows us to compile multiple existing practical signature schemes using cyclic group (e.g., Schnorr, Boneh-Boyen), to achieve a very stringent security guarantee, in an idealized model of the generic (bilinear) group, without introducing much extra efficiency loss. What's more interesting is that, in our design, even the involved idealized model does not exist, our compiled construction will still be able to achieve the classical notion of unforgeability. To achieve both indifferentiability and good efficiency, we develop new techniques in generic (bilinear) group model.

Available format(s)
Publication info
Preprint. Minor revision.
Contact author(s)
czhang20 @ umd edu
hszhou @ vcu edu
hongsheng zhou @ gmail com
2021-05-17: received
Short URL
Creative Commons Attribution


      author = {Charalampos Papamanthou and Cong Zhang and Hong-Sheng Zhou},
      title = {Indifferentiable Signatures: High Performance and Fallback Security},
      howpublished = {Cryptology ePrint Archive, Paper 2021/639},
      year = {2021},
      note = {\url{}},
      url = {}
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