The 2026 Guide to Post-Quantum AI Infrastructure Security: Protecting MCP Deployments

This article warns that the Model Context Protocol (MCP) — the common transport between LLMs and enterprise backends — is a primary attack surface and is vulnerable to schema manipulation, prompt injection, and abuse of over-privileged tokens. It emphasizes the long-term risk of adversaries archiving encrypted AI traffic for future decryption by quantum-capable computers ("Store Now, Decrypt Later"), and recommends adopting crypto-agility, NIST-aligned post-quantum algorithms, granular token scoping, automated inventory, and Policy-as-Code to harden MCP deployments.