When quantum computers become generally available, they’ll be able to crack current public-key cryptographic algorithms, putting digitally stored and transmitted data at risk. But the threat already exists, as attackers use the "harvest now, decrypt later" tactic. Discover why building a comprehensive cryptographic inventory and executing a phased operational strategy are critical for protecting your data against quantum computing attacks. Key takeaways Quantum computing risks are an operational threat today due to "harvest now, decrypt later" (HNDL) tactics, in which adversaries actively harvest and store encrypted data to decrypt it retroactively once quantum capabilities mature. When run on a quantum computer that’s powerful enough, Shor’s Algorithm will break foundational asymmetric infrastructure like the RSA, ECC, and Diffie-Hellman algorithms, although symmetric encryption standards like AES-256 are expected to remain secure against quantum attacks. Globally, more regulatory bodies are starting to mandate a comprehensive cryptographic inventory, making absolute visibility across the digital environment a prerequisite for an orderly post-quantum migration. Transitioning to quantum-resistant cryptography requires a phased operational strategy spanning discovery, prioritization, remediation, and verification. The quantum threat to modern security architecture Future quantum computers will represent a threat to the foundational security architecture that protects digital data. For decades, the global economy, national security apparatus, and critical infrastructure have relied on asymmetric cryptography, specifically RSA and elliptic curve cryptography (ECC) , to secure data in transit, authenticate identities, and protect digital signatures. The mathematical difficulty of factoring large integers or solving discrete logarithm problems has long provided a robust shield against cyber attacks launched using conventional computing capabilities. However, the rapid maturation of quantum computing represents an existential threat to these algorithms. A fully fault-tolerant, cryptographically relevant quantum computer (CRQC) capable of instantly shattering current encryption standards is still several years away. However, organizations need to migrate to quantum-resistant algorithms now. The reason? Adversaries are using " harvest now, decrypt later " (HNDL) tactics. They steal data encrypted with algorithms vulnerable to quantum computing attacks, and save it, hoping to decrypt it in the future once quantum capabilities mature. The impact of Executive Order 14412 Recognizing the immediacy of this threat, regulatory agencies have responded accordingly. The White House recently issued Executive Order 14412, “Securing the Nation Against Advanced Cryptographic Attacks, ” which mandates that executive-branch federal agencies pay immediate operational and engineering attention to post-quantum cryptography (PQC) readiness. This directive introduces critical pillars that redefine enterprise security strategies: Accelerated migration timelines: Moving aggressively ahead of prior federal benchmarks, the EO sets a deadline of Dec. 31, 2030, for transitioning high-value assets to PQC for key establishment, and Dec. 31, 2031, for digital signatures. Supply chain and contractor mandates: The EO directs the Federal Acquisition Regulatory (FAR) Council to require covered federal contractors to meet strict post-quantum Federal Information Processing Standards (FIPS) from the National Institute of Standards and Technology (NIST) by the end of 2030. Cryptographic weakness as an active vulnerability: In a significant shift for vulnerability management , contractors’ vulnerability disclosure programs (VDPs) must explicitly treat the absence of encryption or the use of non-FIPS-approved algorithms as reportable cryptographic vulnerabilities, effectively redefining crypto-hygiene from a passive audit finding to an active risk-mitigation item. The manda…