Google AuthenticatorʢAndroid, iPhone, BlackBerryʣ • AuthyʢAndroid, iPhoneʣ • AuthenticatorʢWindows Phoneʣ • FreeOTPʢAndroidʣ • ※Time-based One-time Password Algorithm ʢTOTPʣʢRFC 6238ʣͰಈ࡞͢ΔݶΓɺଞͷϞόΠϧೝূΞϓϦΛ༻͢Δ͜ͱͰ͖ ·͢ɻ • SMSςΩετϝοηʔδʹ༻͢Δి൪߸US·ͨCAͷΈͰ͢ɻ • ΦʔΨχθʔγϣϯͷΦʔφʔɺཧऀɺΦʔΨχθʔγϣϯԼͰཧ͢ΔΞϓϦέʔγϣϯ͝ͱʹೋஈ֊ೝূΛ༗ޮԽͰ͖·͢ɻ • ϢʔβʔϓϩϑΟʔϧઃఆը໘͔Βɺೋஈ֊ೝূͷ༗ޮԽඇ༗ޮԽΛߦ͑·͢ɻ • ͠ೋஈ֊ೝূ͕༗ޮԽ͞ΕͨΞϓϦέʔγϣϯͰ࡞ۀ͍ͯ͠Δ߹ɺϓϩϑΟʔϧઃఆଆͰೋஈ֊ೝূΛOFFʹ͢ΔͱΞϓϦέʔ γϣϯʹΞΫηεͰ͖ͳ͘ͳΓ·͢ɻ https://docs.acquia.com/cloud-platform/access/two-step-verification/