Two-factor Authentication

Multi-factor authentication is the process of using a known key and a randomly generated unknown key together to secure an account. In addition to creating a strong password, enabling MFA for your organization gives you an additional layer of security, which ensures that your account stays safe and reduces the chance of your data getting compromised.

How Two Factor Authentication works:

Access via a web browser:

• Step 1: User logs in with their Username and Password
• Step 2: If the entered password is correct, the user will receive a unique and random one-time password. (via SMS/Voice call or QR Code as per TFA configuration)
• Step 3: Provide the one-time password (OTP) in the browser. If correct, access to the account is granted.

Access via POP/ IMAP or Active Sync protocols:

• Step 1: The user generates a unique Application-specific Password for each external application used. 
• Step 2: During the configuration of the Zoho account in the application, provide the 12 digits Application-specific Password, instead of the regular password. 
• Step 3: Upon successful validation, you can access your account.

Given that application-specific passwords never expire, you will not be required to update the password in your application, even if your web password expires. You can revoke an application-specific password from the TFA settings to remove access to a particular application. Apart from that, during password reset a user can revoke an application-specific password by revoking auth tokens.

Via Zoho Calendar Apps for iOS and Android (Apps created and published by Zoho):

Zoho Mail provides mobile applications (iOS and Android) to access your Zoho Calendar with its full set of features from smartphones. You can directly login to your account via these apps without application-specific passwords. And when two-factor authentication is enabled, all you need to provide is a one-time password.

• Step 1: The user logs in with Username and Password.
• Step 2: The user gets a secure code via SMS/ Voice call or QR Code app linked with the account during set up.
• Step 3: To access the account, the user provides the secure code in the mobile app.

Enable two-factor authentication for your organization

When you enable TFA in your organization, all the users part of your organization will be required to provide the additional security code to log in and access their account. To enable TFA for your organization,

1. Login to Zoho Mail Admin Console
2. Navigate to Security and Compliance in the left pane.
3. Under Security, go to TFA and toggle it to ON  
   

After the administrator enables TFA, the users will be prompted to choose their preferred TFA method, the next time they log in. If you want to disable TFA for the entire organization, you can follow the same steps and toggle it off  

Enable/ Disable TFA for Specific Users:

The administrator can enable or disable the TFA status for users from the Control Panel.

1. Login to Zoho Mail Admin Console
2. Navigate to Users in the left pane and click the user you would like to enable or disable TFA.
3. Go to Security settings, click TFA, and toggle it off  
   

​Reset TFA for specific users

The administrator can reset the TFA for users, in case they lost the mobile device or do not have access to the mobile device they used at the time of TFA activation. To reset the TFA of a user,

1. Login to Zoho Mail Admin Console
2. Navigate to Users in the left pane and click the user you would like to reset TFA.
3. Go to Security settings, click TFA, and click Reset TFA.
   

Once reset, the user can set up their TFA mode afresh during sign-in.

Generating Application-Specific Password

If two-factor authentication is enabled for an account, then the users have to provide the application-specific password when they access their account via POP/IMAP or Active Sync. To generate an app-specific password,

1. Login to Zoho Accounts
2. From the left menu, navigate to Security and click App passwords
3. Click Generate New Password.
   
4. You will be asked to give a name the name of your application for future reference. Enter the name and click Generate.
   
5. Your password will be generated and it can be used to login from one application.
   

App Specific Password will be required:

1. To authenticate clients use Zoho Mail as an IMAP/ POP account.
2. To sync your Zoho Calendar with calendar clients using CalDAV.
3. To authenticate clients use Zoho Mail as an IMAP/ POP account for organization users with SAML login.