Paper 2026/817 Original: eprint.iacr.org/2026/817 ↗

SOLMAE: Lightweight Post-Quantum Signature based on NTRU lattices with Hybrid Sampling

Abstract

The paper introduces SOLMAE, a lightweight post-quantum signature scheme that follows the traditional hash-and-sign paradigm of Gentry–Peikert–Vaikuntanathan and is instantiated over NTRU lattices using hybrid Gaussian samplers. As a natural successor to earlier designs including Falcon, Mitaka and Antrag, SOLMAE combines the strengths of these approaches. In particular, SOLMAE positions itself as offering a unified framework that achieves improved efficiency and security trade-offs over Falcon, Mitaka, and Antrag, continuing the evolution of efficient lattice-based signatures over structured lattices. SOLMAEleverages the simplicity, speed, and parallelizability of Mitaka while matching the high security and compact key and signature sizes of Falcon. This is achieved through a novel key-generation algorithm that enhances security and removes the rigidity present in Falcon. At the same time, it retains full parameter flexibility and a fast signing procedure. The design is further compatible with recent ellipsoidal Gaussian sampling techniques, enabling even smaller signatures. Altogether, SOLMAE, suitable for resource-constrained environment, establishes a new efficiency point in lattice-based signatures, with remaining implementation considerations deferred to the conclusion.