Cryptology ePrint Archive: Report 2018/857

Raptor: A Practical Lattice-Based (Linkable) Ring Signature

Xingye Lu and Man Ho Au and Zhenfei Zhang

Abstract: We present Raptor, the first practical lattice-based (linkable) ring signature scheme with implementation. Raptor is as fast as classical solutions; while the size of the signature is roughly $1.3$ KB per user. Prior to our work, all existing lattice-based solutions are analogues of their discrete-log or pairing-based counterparts. We develop a generic construction of (linkable) ring signatures based on the well-known generic construction from Rivest et al., which is not fully compatible with lattices. We show that our generic construction is provably secure in random oracle model. We also give instantiations from both standard lattice, as a proof of concept, and NTRU lattice, as an efficient instantiation. We showed that the latter construction, called Raptor, is almost as efficient as the classical RST ring signatures and thus may be of practical interest.

Category / Keywords: public-key cryptography / ring signatures, lattice based cryptography, falcon signature, cryptographic implementations

Date: received 11 Sep 2018, last revised 13 Mar 2019

Contact author: zhenfei zhang at hotmail com,xingye lu@connect polyu hk

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Version: 20190313:153031 (All versions of this report)

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