MFA, SSO, and Passwordless: what they are and when to use each one

Passwords are no longer sufficient to protect sensitive information. In light of this challenge, three authentication methods have stood out: MFA, SSO, and Passwordless. Check it out!

With the rise of cyber attacks — especially those targeting corporate account invasions — digital security has ceased to be an option and has become a strategic priority for companies of all sizes. This scenario has also increased concerns about how users access and authenticate in corporate systems.

Traditional approaches, based solely on passwords, are no longer sufficient to protect sensitive information. In this context, a fundamental question arises: how to ensure security in access without compromising user experience?

In light of this challenge, three authentication methods have stood out: MFA (Multi-Factor Authentication), SSO (Single Sign-On), and Passwordless. Check how each one works and when to apply them!

What is MFA (Multi-Factor Authentication)?

Multi-Factor Authentication (MFA) adds an extra layer of security that requires multiple verification factors, such as tokens, temporary codes, or biometrics.

This way, an additional layer is added, which does not replace identity control but complements traditional authentication, ensuring that only legitimate users have access.

Advantages:

• Reduces the risk of invasion through password theft;

• Protection against phishing and social engineering;

• Low cost and quick implementation.

What is SSO (Single Sign-On)?

SSO (Single Sign-On) allows users to access various systems and applications with a single login. After validating their identity once, there is no need to repeatedly enter passwords — access to authorized systems is done continuously.

Advantages:

• Improves user experience;

• Reduces the number of passwords and risks of weak passwords;

• Facilitates access management and compliance.

What is Passwordless?

Passwordless is an authentication method that does not use traditional passwords. Instead, it allows users to access systems and services using more secure alternatives, such as biometrics, PINs, physical keys, or notifications on mobile devices.

Advantages:

• Completely eliminates the use of passwords;

• Avoids phishing attacks;

• Reduces costs for technical support.

When to use each of the methods?

MFA

If the company has systems that control a large volume of data — especially sensitive financial information or access to administrative resources, such as servers and management dashboards — it is essential to implement Multi-Factor Authentication (MFA).

This extra layer of security helps prevent attacks and data leaks because, even if intruders manage to obtain the password, they will not be able to access the system without the second authentication factor.

• Example: A collaborator accesses the company's financial system, enters their password, and then needs to confirm the login with a code generated by an authenticator app.

SSO (Single Sign-On)

In companies that use various systems daily, such as ERP, CRM, intranet, and collaboration tools, it is common for employees to need to access them multiple times throughout the workday. For the IT team, managing passwords for each application can become complex and inefficient.

SSO (Single Sign-On) solves this problem by allowing the user to log in once to access all integrated systems, without the need to repeatedly enter passwords.

In addition to improving user experience, this approach also enhances security and facilitates access management.

• Example: After authenticating on the company's portal in the morning, a salesperson can access the CRM, corporate email, and sales platform without needing to log in again throughout the day.

Passwordless

When employees use their own devices to access the company's systems, it is essential to adopt solutions that enhance security while also providing a simpler and more efficient user experience.

Passwordless eliminates the need to type passwords, avoiding frustrations with forgotten passwords or frequent changes, and significantly reduces the risk of credential-based attacks, such as phishing and password leaks.

• Example: An employee accesses the company's system via smartphone and authenticates using their fingerprint — without needing to type any password.

Combination of SSO, MFA, and Passwordless

It is important to note that security tools and methodologies are complementary, meaning it is not about choosing one or the other, but rather about complementing solutions for a unified and even more robust strategy.

This integration allows for a balance between protection and usability, offering a seamless experience for users without sacrificing security.

This type of combination is the currently recommended model by corporate identity providers, such as Microsoft Entra ID.

Best practices for implementation

MFA (Multi-Factor Authentication)

• Use authenticator apps (like Microsoft Authenticator);

• Require MFA especially for critical access (administrative accounts, emails, servers, VPN, etc.);

• Train users to recognize phishing attempts.

SSO (Single Sign-On)

• Centralize access on a trusted platform (like Microsoft Entra ID);

• Implement session control;

• Integrate all critical applications into SSO.

Passwordless

• Adopt reliable passwordless authentication methods;

• Implement progressively;

• Maintain a secure account recovery method.

Protecting corporate systems goes far beyond requiring strong passwords. With the increase in digital risks, solutions like MFA, SSO, and Passwordless have become essential to reinforce security and simplify access.

Each has its role, and when combined, they offer a secure, efficient strategy tailored to the company's needs.

Want to understand which model makes the most sense for your company? Talk to our specialists and design your digital security strategy!