Z-Sigil: A Public-Key Cryptosystem with Chained Selection over a Fiber Bundle of Module-Lattice Keys
Z-Sigil is a public-key cryptosystem using module-lattice keys organized over a fiber bundle of torsion points on a flat Kähler torus. It allows plaintext to control which key in the chain is accessed for encryption, replacing older geometric proposals and providing IND-CPA security based on Module-LWE assumptions.