# PROXIABLE DESIGNATED VERIFIER SIGNATURE

### Mebae Ushida, Kazuo Ohta, Yutaka Kawai, Kazuki Yoneyama

#### Abstract

Designated Verifier Signature (DVS) guarantees that only a verifier designated by a signer can verify the “validity of a signature”. In this paper, we propose a new variant of DVS; Proxiable Designated Verifier Signature (PDVS) where the verifier can make a third party (i.e. the proxy) substitute some process of the verification. In the PDVS system, the verifier can reduce his computational cost by delegating some process of the verification without revealing the validity of the signature to the proxy. In all DVS systems, the validity of a signature means that a signature satisfies both properties that (1) the signature is judged “accept” by a decision algorithm and (2) the signature is confirmed at it is generated by the signer. So in the PDVS system, the verifier can make the proxy substitute checking only the property of (1). In the proposed PDVS model, we divide verifier’s secret keys into two parts; one is a key for performing the decision algorithm, and the other is a key for generating a dummy signature, which prevents a third party from convincing the property (2). We also define security requirements for the PDVS, and propose a PDVS scheme which satisfies all security requirements we define.

#### References

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#### Paper Citation

#### in Harvard Style

Ushida M., Ohta K., Kawai Y. and Yoneyama K. (2010). **PROXIABLE DESIGNATED VERIFIER SIGNATURE** . In *Proceedings of the International Conference on Security and Cryptography - Volume 1: SECRYPT, (ICETE 2010)* ISBN 978-989-8425-18-8, pages 344-353. DOI: 10.5220/0002979403440353

#### in Bibtex Style

@conference{secrypt10,

author={Mebae Ushida and Kazuo Ohta and Yutaka Kawai and Kazuki Yoneyama},

title={PROXIABLE DESIGNATED VERIFIER SIGNATURE},

booktitle={Proceedings of the International Conference on Security and Cryptography - Volume 1: SECRYPT, (ICETE 2010)},

year={2010},

pages={344-353},

publisher={SciTePress},

organization={INSTICC},

doi={10.5220/0002979403440353},

isbn={978-989-8425-18-8},

}

#### in EndNote Style

TY - CONF

JO - Proceedings of the International Conference on Security and Cryptography - Volume 1: SECRYPT, (ICETE 2010)

TI - PROXIABLE DESIGNATED VERIFIER SIGNATURE

SN - 978-989-8425-18-8

AU - Ushida M.

AU - Ohta K.

AU - Kawai Y.

AU - Yoneyama K.

PY - 2010

SP - 344

EP - 353

DO - 10.5220/0002979403440353