Cryptology ePrint Archive: Report 2017/247

Efficient Multivariate Ring Signature Schemes

Mohamed Saied Emam Mohamed and Albrecht Petzoldt

Abstract: Multivariate Cryptography is one of the main candidates for creating post-quantum cryptosystems. Especially in the area of digital signatures, there exist many practical and secure multivariate schemes. However, there is a lack of more advanced schemes, such as schemes for oblivious transfer and signature schemes with special properties. While, in the last years, a number of multivariate ring signature schemes have been proposed, all of these have weaknesses in terms of security or efficiency. In this paper we propose a simple and efficient technique to extend arbitrary multivariate signature schemes to ring signature schemes and illustrate it using the example of Rainbow. The resulting scheme provides perfect anonymity for the signer (as member of a group), as well as shorter ring signatures than all previously proposed post-quantum ring signature schemes.

Category / Keywords: public-key cryptography / Multivariate, Ring Signatures

Original Publication (with minor differences): AfricaCrypt 2017

Date: received 14 Mar 2017

Contact author: mohamed at cdc informatik tu-darmstadt de

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Version: 20170320:142246 (All versions of this report)

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