A convertible undeniable signature allows a signer to confirm or disavow a non-self-authenticating signature and also convert a valid one to a publicly verifiable signature. During the conversion, existing schemes either require the signer to be stateful, or have their security based on the random oracle assumption, or result in getting a large converter. In this work we propose a new construction, which supports both selective and universal conversion, and is provably secure without random oracles. It has the shortest undeniable signature and the smallest converter. A signature consists of three bilinear group elements and just one group element each in a selective converter and a universal converter. The scheme can be extended further to support new features, such as the delegation of conversion and confirmation/disavowal, threshold conversion and others. © 2011 Springer-Verlag Berlin Heidelberg.
CITATION STYLE
Huang, Q., & Wong, D. S. (2011). Short convertible undeniable signature in the standard model. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 6672 LNCS, pp. 257–272). https://doi.org/10.1007/978-3-642-21031-0_20
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