Quantum Risk Is Already Here: An Enterprise Buyer's Guide to Assessing Third-Party Cryptographic Readiness Before Q-Day, Part 2: Assessment Framework and Deployment Guide

The quantum threat to your third-party risk portfolio is not a future risk - it is a present and compounding one. Harvest-now-decrypt-later (HNDL) attacks are collecting data that your vendors encrypt today for retroactive decryption. Trust-now-forge-later (TNFL) attacks are harvesting signed vendor artifacts today for retroactive provenance forgery - corrupting the integrity of the software supply chain, the audit trail's non-repudiation, and the regulatory evidence chains your organization depends on. With NIST finalizing three PQC standards in August 2024, CISA issuing federal procurement guidance in January 2026, and NIST IR 8547 proposing to deprecate quantum-vulnerable asymmetric algorithms after 2030 and disallow them after 2035, the regulatory landscape has reached a decisive inflection point - one that converts every vendor migration road map question from a matter of opinion into a matter of your organization's alignment with an accelerating compliance obligation.This document is Part 2 of a two-part IDC Perspective series for enterprise buyers. It delivers the complete 48-question Third-Party Quantum Encryption Readiness Assessment Framework across 11 domains, with tiered deployment guidance scaled from five baseline questions for commodity vendor relationships to all 48 for critical Tier 1 relationships, full evidence collection methods, and practical buyer program management guidance - including crypto agility assessment architecture, Continuous Quantum Control Assurance (Q-CCA) requirements, and the Quantum Risk Operations Center (Q-ROC) capability model for continuous vendor posture monitoring. Enterprise buyers should read Part 1 for the strategic and threat context before deploying this framework. The window to establish assessment program leadership - and to build the vendor accountability infrastructure before regulators require it - is open now and will narrow as the market matures."The 48-question framework in this document is not a compliance exercise - it is a risk management instrument. The enterprise buyers who will manage quantum risk effectively are not those who send these questions annually and file the responses, but those who build the continuous assessment infrastructure behind the program: automated evidence requirements, runtime vendor posture visibility, and crypto agility benchmarks that treat algorithm replacement readiness as a procurement criterion rather than a future consideration. Q-Day is not a risk event. The risk event is the moment your board asks what your vendors' quantum exposure is across your critical data flows - and you cannot answer," says Philip D. Harris, CISSP, CCSK, research vice president, Governance, Risk, and Compliance Solutions, IDC