https://blog.ast.moe/en/tags/webauthn/Recent posts: GorimuchuHugohttps://blog.ast.moe/en/blog/2026-10-07/Thu, 08 Oct 2026 06:58:01 +0900https://blog.ast.moe/en/blog/2026-10-07/<p>I was just wondering how a YubiKey actually performs authentication.</p> <p>I started using the YubiKey 5C NFC in 2023, and later I also bought a USB‑A model. At the time I introduced it to protect my 1Password account, planning to register one key for everyday carry and another as a spare kept at home. (<a href="https://blog.ast.moe/blog/2023-01-27/">source</a>) (<a href="https://blog.ast.moe/blog/2023-03-07/">source</a>)</p> <p>You plug it into a USB port and touch it when needed. With a smartphone you use NFC. The user interaction is minimal, but I’ve never taken the time to understand exactly what’s happening behind the scenes.</p>