Paper 2026/2000
Information-Theoretic Hiding in Quantum Marginal Fibers
Abstract
We study information-theoretic hiding when an adversary has unrestricted quantum processing but physical access to only one region from a declared family of subsystems. Perfectly hidden classical codewords lie in one fiber of the corresponding marginal map. We organize trace-distance diameter, orthogonal zero-error packing, and exact coherent subspace hiding on this fixed-marginal set, distinguishing equality of basis-state marginals from the cross-term conditions of quantum error correction.
Note: The cryptographic motivation was presented in preliminary, non-proceedings form at the EUROCRYPT 2026 Rump Session. The present manuscript provides the detailed mathematical development and proofs.
Metadata
- Available format(s)
-
PDF
- Category
- Foundations
- Publication info
- Preprint.
- Keywords
- quantum cryptographyquantum marginal problem
- Contact author(s)
- hruby jar @ centrum cz
- History
- 2026-09-14: approved
- 2026-09-13: received
- See all versions
- Short URL
- https://ia.cr/2026/2000
- License
-
CC0
BibTeX
@misc{cryptoeprint:2026/2000,
author = {Jaroslav Hruby},
title = {Information-Theoretic Hiding in Quantum Marginal Fibers},
howpublished = {Cryptology {ePrint} Archive, Paper 2026/2000},
year = {2026},
url = {https://eprint.iacr.org/2026/2000}
}
