# Quantum Digital Signature Using Entangled States for Network

## TL;DR

This paper introduces a new quantum digital signature protocol using entangled states that reduces latency and complexity for quantum networks.

## Contribution

The protocol eliminates QKD post-processing by using raw conclusive keys for signing and verification.

## Key findings

- The protocol shows a consistent signature rate advantage over a Lamport-inspired QDS baseline.
- Simulations confirm its performance under standard fiber-loss and detector models.
- It preserves finite key security guarantees for near-term deployment.

## Abstract

We propose an entanglement-based quantum digital signature (QDS) protocol optimized for quantum networks. The protocol follows the Lamport-inspired QDS paradigm but eliminates QKD post-processing by signing and verifying with raw conclusive keys, thereby reducing latency and implementation complexity. We provide a finite-size security analysis of robustness, unforgeability, and non-repudiation. Under standard fiber-loss and detector models, simulations show a consistent signature rate advantage over a representative Lamport-inspired QDS baseline across metro-to-regional distances. The proposed protocol is practical for near-term deployment while preserving end-to-end, finite key security guarantees.