Guancheng Li

Researcher

Tencent

Guancheng Li (@atuml1) is a senior researcher at Tencent Security Xuanwu Lab. His research interests lie in software and system security, IoT security, cryptography, and AI. He is also a founder and former captain of r3kapig CTF Team.

Speaker sessions

RSA/EC Under Quantum Countdown: Quantum Timeline, Insights on Migration Challenges and Our Open-Source Solutions

Quantum computing is no longer a distant theory—it is on an accelerating trajectory that directly threatens the foundations of RSA and elliptic curve cryptography. This session begins with a grounded analysis of the current state of quantum computer manufacturing, its key bottlenecks, and what these mean for the realistic timeline to break RSA in practice. We will show how the “quantum countdown” is shifting from scientific feasibility to engineering scale, and why this transition makes the post-quantum migration window urgent today. Cloud providers, including Tencent Cloud, have begun building post-quantum safe services. However, achieving quantum safety for customers’ businesses requires migrating not only their own applications but also the complex ecosystems of software dependencies they rely on. The high degree of fragmentation across this software supply chain makes unified migration difficult. We argue that community co-building is essential: migration cannot be solved in isolation, and requires shared visibility, shared knowledge, and shared tooling. To support this, we present our open-source solutions: - Cryptographic Asset Identification Tool – systematic source-based discovery of cryptographic usage to build precise migration inventories.- Post-Quantum InfoHub – a continuously updated knowledge hub tracking standards, regulations, and best practices.- Ecosystem PQC Capability Matrix – version-level dependency readiness insights for accurate migration planning.- Proxy/Tunneling-Based Migration Tool – enabling PQC-secure network communications with minimal application modifications. By combining a realistic quantum timeline with practical migration solutions, this session provides both urgency and actionable pathways for the community.