I think there are many users who use Gmail as their main registration and contact method, but just adding a few settings will make it even more convenient. Writer Toru Shima introduces useful Gmail tips in daily life.
This time, we will introduce "two-step verification" to prevent unauthorized access to Gmail and Google accounts.
If you enable two-factor authentication for your Gmail and Google accounts, when you log in to your Google account on your PC, you will be asked for permission to receive a login notification sent to your smartphone in addition to verifying your password.
If you set up 2-step authentication and log in from a PC or smartphone that you do not normally use, you will be required to authenticate with your smartphone. It is an effective means of dealing with unauthorized access.
The advantage of 2-step verification is that even if someone else accesses your Google account or successfully logs in the first time with a guessed password, you won't be able to get through the 2nd step login unless you have your smartphone with you. is.
In addition, when you successfully log in with your password, you will receive a notification on your smartphone, so you can take measures such as changing your password immediately against unauthorized access.
To enable two-step verification on your Google account, click "Try it" from the site below. This website also explains how two-factor authentication works.
Alternatively, if you are using a PC, select "Google Account" from the service list icon displayed in the upper right corner of Gmail, etc., and then select "Login and Security" → "Login to Google".
[Google 2-Step Verification Process] https://www.google.co.jp/intl/ja/landing/2step/
On Google's two-step verification site, you can also check the mechanism and function of two-step verification.
When you click "Try it", the two-factor authentication setting will start. Enter your Google account password again when prompted.
On the 2-step verification screen, smartphones that can receive 2-step verification notification messages are displayed. Android devices that use the same Google account and iPhones that use the same Google account on the Gmail app are displayed.
If you click "Send Now", you will receive a message to confirm your login, just like the actual two-factor authentication, so tap "Yes".
After proceeding with the two-step verification settings, a confirmation screen for the terminal to which the two-step verification message will be sent will be displayed. If you want to delete the device, delete the Google account from the device, or delete it from the Google account management site "Login to Google" → "Two-step verification process" screen after setting.
Finally, you will be asked to set up a verification method using SMS as an emergency response method when two-factor authentication is not available. Enter the phone number of your smartphone, etc., and enter the code received by SMS.
Also set up an authentication method using SMS for emergencies
From now on, when you log in to your Google account from a PC or smartphone that you do not normally use, you will receive a notification message asking if you are allowed to log in to your smartphone.
Google's two-factor authentication provides a method that allows you to authenticate even if your smartphone is offline or you cannot bring your smartphone with you. These are basically functions for corporations, but let's check them in case they are required in data centers, overseas, remote islands, etc.
Detailed settings for two-factor authentication can be set from "Login and Security" by selecting "Google Account" from the service list icon in the upper right corner of Gmail, etc. on a PC.
[Google account login and security] https://myaccount.google.com/security
For users who need 2-step verification in an offline environment, register an additional offline authentication method in advance.
The following three methods and a security code can be used for two-step authentication when offline. Other than the security code, you need to register for use in advance, so let's complete the settings if necessary.
●Backup code A backup code that can be used only once will be issued in advance, and you can carry it around by printing it out or by other means.
●Authentication system app Use one-time passwords that can be issued by Google's Android and iPhone "Google Authentication system app". To use it, download the app and register for two-factor authentication.
●Security key A separate security key that supports FIDO Universal 2nd Factor (U2F) is required. After registering the device and key, authenticate with a connectable method such as USB, NFC, or Bluetooth.
●Security code Many security codes can be issued for Android devices. For most devices, it can be issued from "Settings" → "Google" → "Google Account" → "Security" → "Security Code".