Explore a 16-minute IEEE conference talk on Binsec/Rel, an efficient relational symbolic execution tool for verifying constant-time programming at the binary level. Learn about the challenges of writing constant-time code to prevent timing side-channel attacks and the importance of binary-level analysis. Discover how Binsec/Rel improves upon previous symbolic execution techniques with optimizations for information flow and binary-level analysis. Examine the tool's effectiveness in bug-finding and bounded-verification through extensive experiments on cryptographic implementations. Gain insights into the impact of compiler optimizations on constant-time preservation and understand why binary-level reasoning is crucial for ensuring security in cryptographic code.