Google Authenticator vs Guard Dog

The Google Authenticator plugin for WordPress gives you two-factor authentication using the Google Authenticator app for Android/iPhone/Blackberry. If you are security aware, you may already have the Google Authenticator app installed on your smartphone, using it for two-factor authentication on Gmail/Dropbox/Lastpass/Amazon etc. The two-factor authentication requirement can be enabled on a per-user basis. You could enable it for your administrator account, but log in as usual with less privileged accounts. If You need to maintain your blog using an Android/iPhone app, or any other software using the XMLRPC interface, you can enable the App password feature in this plugin, but please note that enabling the App password feature will make your blog less secure. Credits Thanks to: Miguel Mendez Z for responsibly disclosing a CSRF account lockout vulnerability. Oleksiy for a bugfix in multisite. Paweł Nowacki for the Polish translation Fabio Zumbi for the Portuguese translation Guido Schalkx for the Dutch translation. Henrik.Schack for writing/maintaining versions 0.20 through 0.48 Tobias Bäthge for his code rewrite and German translation. Pascal de Bruijn for his “relaxed mode” idea. Daniel Werl for his usability tips. Dion Hulse for his bugfixes. Aldo Latino for his Italian translation. Kaijia Feng for his Simplified Chinese translation. Alex Concha for his security tips. Jerome Etienne for his jquery-qrcode plugin. Sébastien Prunier for his Spanish and French translation.

Guard Dog is a focused WordPress security plugin for the login door, authentication, sessions, and practical access workflows. With custom login URLs, two-factor authentication, passkeys, CAPTCHA providers, access control, and activity logging, Guard Dog helps site owners tighten the parts of WordPress that get bothered most. Key Features: Custom Login URLs – Hide your wp-admin and wp-login.php from attackers Two-Factor Authentication (2FA) – TOTP-based authentication with recovery codes Social Login (OAuth) – Sign in with Google, Microsoft, or Apple Passkeys – Use device-based biometric authentication like Face ID, Touch ID or Windows Hello Multiple CAPTCHA Providers – Support for Google reCAPTCHA v2/v3, hCaptcha, and Cloudflare Turnstile Login Attempt Limiting – Prevent brute-force attacks with intelligent lockout Access Control – IP-based whitelist/blacklist protection Activity Monitoring – Comprehensive logging of security events Temporary User Access – Create temporary WordPress users with time-limited, secure access Frontend Account Security – Shortcodes and blocks for login, passkeys, 2FA, and session controls Why Choose Guard Dog? Privacy-Focused – Multiple CAPTCHA options including privacy-first providers WordPress.org Compliant – Built following WordPress coding standards Site-Owned Controls – Protections run inside your WordPress site User-Friendly – Intuitive interface with helpful documentation Regular Updates – Actively maintained and updated Perfect For: Business websites requiring enhanced security WordPress sites handling sensitive data Multi-user sites with complex access requirements Anyone wanting practical login and account protection without a central SaaS dependency Frontend Shortcodes: [guard_dog_login_form] renders a public Guard Dog-managed login form [guard_dog_passkey_login] renders a standalone passkey sign-in button for custom login pages [guard_dog_two_factor] renders logged-in 2FA management [guard_dog_passkeys] renders logged-in passkey management [guard_dog_sessions] renders logged-in active-session management [guard_dog_account_security] renders the composite logged-in account security widget for 2FA, passkeys, and sessions [guard_dog_2fa] remains supported as the legacy alias for the account security widget Block-based themes can use the matching Guard Dog Login Form, Passkey Login, Two-Factor Auth, Passkeys, Sessions, and Account Security blocks. Additional Information Support: For support questions, please use the WordPress.org support forums. Privacy: Guard Dog respects user privacy and offers multiple privacy-focused options. Third-party services are only contacted when you enable features that need them, such as CAPTCHA, email delivery, social login, IP reputation, or geolocation. Security: Guard Dog follows WordPress security best practices. User input is sanitized and output is escaped throughout the plugin. Third-Party Services Guard Dog integrates with the following third-party services to provide CAPTCHA protection. These services are optional and only used when CAPTCHA features are enabled. Google reCAPTCHA (v2 and v3) What it is: Google’s CAPTCHA service that helps protect websites from spam and abuse. What it’s used for: – Verifying that login, registration, and password reset attempts are made by humans – Preventing automated bot attacks on your WordPress forms What data is sent and when: – User interaction data (mouse movements, time spent on page) when CAPTCHA is solved – IP address of the user – Site domain for verification – CAPTCHA response token Privacy and Terms: – Google reCAPTCHA Privacy Policy – Google reCAPTCHA Terms of Service – Google reCAPTCHA Data Usage Cloudflare Turnstile What it is: Cloudflare’s privacy-first CAPTCHA alternative that doesn’t require user interaction. What it’s used for: – Invisible verification of human users during login, registration, and password reset – Privacy-focused protection without tracking or cookies What data is sent and when: – Non-interactive browser signals when forms are submitted – IP address for verification – Site domain for validation Privacy and Terms: – Cloudflare Privacy Policy – Cloudflare Terms of Service – Turnstile Documentation hCaptcha What it is: A privacy-focused CAPTCHA service that doesn’t track users across websites. What it’s used for: – Human verification during login, registration, and password reset forms – Privacy-conscious alternative to Google reCAPTCHA What data is sent and when: – User interaction with CAPTCHA challenge – IP address for verification – Site domain for validation Privacy and Terms: – hCaptcha Privacy Policy – hCaptcha Terms of Service – hCaptcha Data Processing Google OAuth (Social Login) What it is: Google’s OAuth 2.0 service that allows users to sign in using their Google account. What it’s used for: – Authenticating WordPress users via their Google account – Retrieving basic profile information (name, email) to link or create accounts What data is sent and when: – User is redirected to Google’s authorization server when clicking “Sign in with Google” – An authorization code is exchanged for an access token on your server – Basic profile information (name, email, Google user ID) is retrieved from Google’s API – No ongoing data sharing – data is only retrieved during the login process Privacy and Terms: – Google OAuth Privacy Policy – Google OAuth Terms of Service – Google API Services User Data Policy Microsoft Azure AD (Social Login) What it is: Microsoft’s OAuth 2.0 service via Azure Active Directory that allows users to sign in using their Microsoft account. What it’s used for: – Authenticating WordPress users via their personal Microsoft account or organizational (work/school) account – Retrieving basic profile information (name, email) to link or create accounts What data is sent and when: – User is redirected to Microsoft’s authorization server when clicking “Sign in with Microsoft” – An authorization code is exchanged for an access token and ID token (JWT) on your server – Basic profile information (name, email, Azure object ID) is extracted from the ID token – No ongoing data sharing – data is only retrieved during the login process Privacy and Terms: – Microsoft Privacy Statement – Microsoft Services Agreement – Microsoft Identity Platform Documentation Apple Sign In (Social Login) What it is: Apple’s OAuth 2.0 / OpenID Connect service that allows users to sign in using their Apple ID. What it’s used for: – Authenticating WordPress users via their Apple ID – Retrieving basic profile information (name, email) to link or create accounts What data is sent and when: – User is redirected to Apple’s authorization server when clicking “Sign in with Apple” – An authorization code is exchanged for an access token and ID token (JWT) on your server – Basic profile information (email, user ID) is extracted from the ID token – User’s name is only provided on first authorization; subsequent logins return only the user ID – Apple may provide a private relay email address instead of the user’s real email – No ongoing data sharing – data is only retrieved during the login process Privacy and Terms: – Apple Privacy Policy – Sign in with Apple Guidelines – Apple Developer Program License Agreement TOTP (Time-based One-Time Password) Standard What it is: An open standard (RFC 6238) for generating time-based one-time passwords used in two-factor authentication. What it’s used for: – Generating secure, time-limited authentication codes for 2FA – Providing backup authentication when primary 2FA methods are unavailable – Enabling compatibility with popular authenticator apps (Google Authenticator, Authy, Microsoft Authenticator, etc.) What data is sent and when: – No external data transmission – TOTP codes are generated locally using the TOTP algorithm – Secret key generation – A unique secret key is generated locally when 2FA is enabled for a user – QR code generation – QR codes are generated locally for easy setup with authenticator apps – Code verification – Generated codes are verified locally against the stored secret key Privacy and Terms: – RFC 6238 – TOTP Standard – Google Authenticator Privacy Policy (if using Google Authenticator app) – Authy Privacy Policy (if using Authy app) – Microsoft Authenticator Privacy Policy (if using Microsoft Authenticator app) Data Handling Summary When CAPTCHA is disabled: No data is sent to any third-party services. When CAPTCHA is enabled: Only the specific provider you choose receives verification data. Data is not shared between providers or stored by Guard Dog beyond the verification process. When 2FA is disabled: No external data transmission occurs. When 2FA is enabled: – All TOTP operations (code generation, verification) happen locally on your server – No data is transmitted to external services for 2FA functionality – Authenticator apps only receive the initial setup QR code or secret key – Recovery codes are generated locally and stored securely When Social Login is disabled: No data is sent to any OAuth provider. When Social Login is enabled: – Data is only sent to the configured providers (Google, Microsoft, Apple) during the login process – Only basic profile information (name, email, user ID) is retrieved – Social account links are stored locally in your WordPress database – Users can unlink their social accounts from their profile at any time User control: Users can choose which CAPTCHA provider to use, or disable CAPTCHA entirely. 2FA can be enabled/disabled per user, and users can choose their preferred authenticator app. Social login can be enabled/disabled by administrators, and users can manage their linked social accounts. All security features are optional and configurable.