Cryptanalysis of a lattice-based proxy signature scheme

Details Cryptanalysis of a lattice-based proxy signature scheme Cryptanalysis of a lattice-based proxy signature scheme

2011-10-19

arxiv.org/abs/1110.4196v2

Computer Science

Cryptography and Security

Journal version of the paper will be appearing in International Journal of Network Security

Scientific paper

A proxy signature scheme allows a proxy signer to sign messages on behalf of an original signer. Proxy signature schemes have found numerous practical applications such as grid computing, mobile agent systems and cloud applications. Recently, Jiang et al. proposed the first lattice-based proxy signature scheme and claimed that their scheme provides all the security properties of a secure proxy signature scheme. However, in this paper, we disprove their claim and show that an original signer is able to forge a proxy signature on any message.

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