---
res:
bibo_abstract:
- "Zero-knowledge proofs of knowledge (ZK-PoK) for discrete logarithms and related
problems are indispensable for practical cryptographic protocols. Recently, Camenisch,
Kiayias, and Yung provided a specification language (the CKY-language) for such
protocols which allows for a modular design and protocol analysis: for every zero-knowledge
proof specified in this language, protocol designers are ensured that there exists
an efficient protocol which indeed proves the specified statement.\n\nHowever,
the protocols resulting from their compilation techniques only satisfy the classical
notion of ZK-PoK, which is not retained are when they used as building blocks
for higher-level applications or composed with other protocols.\nThis problem
can be tackled by moving to the Universal Composability (UC) framework, which
guarantees retention of security when composing protocols in arbitrary ways. \nWhile
there exist generic transformations from $\\Sigma$-protocols to UC-secure protocols,
these transformation are often too inefficient for practice.\n \nIn this paper
we introduce a specification language akin to the CKY-language and a compiler
such that the resulting protocols are UC-secure and efficient. \nTo this end,
we propose an extension of the UC-framework addressing the \nissue that UC-secure
zero-knowledge proofs are by definition proofs of knowledge, and state a special
composition theorem which allows one to use the weaker -- but more efficient and
often sufficient -- notion of proofs of membership in the UC-framework. \nWe
believe that our contributions enable the design of practically efficient protocols
that are UC-secure and thus themselves can be used as building blocks.@eng"
bibo_authorlist:
- foaf_Person:
foaf_givenName: Jan
foaf_name: Camenisch, Jan
foaf_surname: Camenisch
- foaf_Person:
foaf_givenName: Stephan
foaf_name: Stephan Krenn
foaf_surname: Krenn
foaf_workInfoHomepage: http://www.librecat.org/personId=329FCCF0-F248-11E8-B48F-1D18A9856A87
- foaf_Person:
foaf_givenName: Victor
foaf_name: Shoup, Victor
foaf_surname: Shoup
bibo_doi: 10.1007/978-3-642-25385-0
bibo_volume: 7073
dct_date: 2011^xs_gYear
dct_publisher: Springer@
dct_title: A Framework for Practical Universally Composable Zero-Knowledge Protocols@
...