What is offensive-security-quantum-computing?

This repository is a long technical reference document about how quantum computers could be used as offensive security tools in the future. It is written for security researchers and red team practitioners, meaning people whose job is to probe and test the security of computer systems on behalf of organizations that hire them to find weaknesses. The document covers two main concerns. The first is the threat that quantum computers pose to the encryption systems the internet currently relies on. Most encryption used today, including the kind that protects bank logins and private messages, relies on mathematical problems that are very hard for classical computers to solve but that a powerful quantum computer could crack using known algorithms. The document explains which encryption types are at risk and which are considered safe even after a capable quantum computer exists. It also covers a strategy called "Harvest Now, Decrypt Later," where adversaries collect and store encrypted communications today with the intention of decrypting them once quantum hardware becomes powerful enough. There is evidence cited that nation-state programs are already doing this. The second focus is on the attack surface of quantum computing infrastructure itself: how quantum key distribution systems, quantum random number generators, and early quantum networks can be targeted or manipulated. The document walks through specific quantum algorithms, including Shor's algorithm for breaking public-key encryption and Grover's algorithm for weakening symmetric encryption, and discusses what they mean in practical terms for defenders and attackers. It also covers post-quantum cryptography, a set of new encryption standards designed to resist quantum attacks, and notes where early implementations of those standards may introduce their own vulnerabilities. There is no code in this repository. It is a Markdown document structured like an academic reference with 21 sections, tables, and diagrams. It contains no installation instructions and nothing to run.