2段éèªè¨¼(Two Factor Authentication) ã¨ã¯Wikipediaã«ããã¨ããç°ãªã2ã¤ã®ã³ã³ãã¼ãã³ããçµã¿åããã«ãããã¦ã¼ã¶ã¼ã®æ確ãªèå¥ãæä¾ããèªè¨¼ãã¨ããã¾ããï¼ä»¥ä¸ã2段éèªè¨¼ã2FAã¨æ¸ãã¾ãï¼ ä¼ç¤¾ã®VPNã«ã¢ã¯ã»ã¹ããããã«ãã¹ã¯ã¼ãã¨èªè¨¼ç¨ã®USBã¹ãã£ãã¯ã使ããã¨ããã®ã2FAã«ãªãã¾ãã Webãµã¼ãã¹ã®å ´åã¯ã¦ã¼ã¶ãè¨å®ãããã¹ã¯ã¼ãã«å ãã¦ãã¯ã³ã¿ã¤ã ãã¹ã¯ã¼ããç¨ããæ¹å¼ã主æµã¨ãªã£ã¦ãã¾ãã ãã®ã¯ã³ã¿ã¤ã ãã¹ã¯ã¼ãã®çæã«ã¯RFCã§ä»æ§ã決ãããã¦ããHOTP(HMAC-based One-time Password Algorithm)ãTOTP(Time-based One-time Password Algorithm)ãç¨ãããã¾ãã ããå©ç¨ããã¦ããã®ã¯æéãã¼ã¹ã®TOTPãªã®ã§ä»¥ä¸ã¯TOTPã«ãã©ã¼ã«ã¹ãã¦ããããã¨
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