> **Source:** https://knowledge.leegality.com/document-execution/leegality-features/invitee-level/security/one-factor-authentication
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# One Factor Authentication

**One Factor Authentication** adds an essential layer of security to the signing process by requiring invitees to authenticate their identity via OTP sent to their Email ID or Phone Number (as configured during document setup). This ensures that only the intended recipient can access and view the document, safeguarding against unauthorized access due to mistaken forwarding of signing invitations.

## Use One Factor Authentication

#### V3 Workflow

1. On the **Invitee card**, click **Invitee level Options**.
2. Toggle ON **Enable Security Features**.
3. Enable the **Require 1-factor authentication before document preview**.
4. Click **Save** and continue.

#### Workflow Creation

1. On the **Invitee card**, click **More Options**.
2. Toggle ON **Advanced Security Features**.
3. Enable the **Enforce 1-factor authentication before document preview**.
4. Click **Save** and continue.

The workflow runner cannot disable notifications if enabled by the workflow creator, and vice versa.

#### V4 Workflow

1. On the **Invite** stage, select the invitee card.
2. In the right panel, open the **Settings** tab and go to **Security Options**.
3. Enable **1 Factor Authentication before document preview** — the invitee must verify an OTP via email or phone number before they can preview the document.

#### Workflow Creation

1. On the **Invite** stage, select the invitee card.
2. In the right panel, open the **Settings** tab and go to **Security Options**.
3. Enable **1 Factor Authentication before document preview** — the invitee must verify an OTP via email or phone number before they can preview the document.

**Note:** Whether the workflow runner can modify this setting depends on the [field properties](https://knowledge.leegality.com/document-execution/workflows/v4/setup-configuration/field-properties) set by the workflow creator.

> **Info — Note**
>
> One Factor Authentication does not work with Quick Sign.

## Signing Journey

1. Click the **Sign** button in the email invitation or the eSign link received via SMS.  
2. Provide the OTP sent to the email address or phone number associated with the eSign invitation.  
3. Check your email or SMS for the OTP.  
4. Input the OTP and click **Proceed**.  
5. Access the document and proceed with the signing/reviewing process.