Single Sign-On: Simplifying Access Without Sacrificing Security

The average employee uses between 10 and 30 different applications during a typical workday, and each one traditionally requires its own username and password. This creates a predictable problem: people reuse passwords, write them on sticky notes, or choose weak credentials because they cannot realistically memorize dozens of unique complex passwords. Single sign-on addresses this by allowing employees to authenticate once and gain access to all authorized applications without logging in again. The result is fewer passwords to manage, fewer security gaps to exploit, and less time wasted on login screens.

How Single Sign-On Works

SSO uses a centralized identity provider to authenticate users and then passes that verified identity to connected applications. When an employee logs in at the start of their day, the identity provider issues a secure token that other applications accept as proof of authentication. The most widely used protocols for this exchange are SAML 2.0 and OpenID Connect, both of which are open standards supported by virtually every major SaaS application and enterprise platform.

The employee sees a single login screen. Behind that screen, the identity provider verifies their credentials, checks any additional authentication requirements such as multi-factor authentication, and then communicates with each connected application through encrypted assertions. The applications never see the user’s actual password. They only receive a cryptographically signed confirmation that the identity provider has verified this user’s identity.

The Security Case for SSO

It may seem counterintuitive that reducing the number of logins improves security, but the evidence is clear. The Cybersecurity and Infrastructure Security Agency consistently recommends centralized identity management as a foundational security practice. When users have one strong password protected by multi-factor authentication instead of dozens of weak passwords scattered across applications, the overall attack surface shrinks dramatically.

SSO also provides a single point of enforcement for security policies. When an employee leaves the organization, disabling their identity provider account immediately revokes access to every connected application. Without SSO, IT teams must manually deactivate accounts across each individual platform, a process that frequently leaves orphaned accounts active for days or weeks. Those orphaned accounts represent real risk, as former employees or attackers who compromise those credentials gain access to business data long after the relationship has ended.

What SSO Does Not Replace

SSO is not a substitute for multi-factor authentication. In fact, SSO makes MFA more important because a single compromised credential now unlocks access to multiple applications rather than just one. Every SSO implementation should require MFA at the identity provider level. This means the centralized login requires both a password and a second factor such as a hardware key, authenticator app, or biometric verification.

SSO also does not eliminate the need for role-based access controls within individual applications. Just because an employee can authenticate does not mean they should have access to every feature or dataset within every connected application. Authorization, which determines what a user can do after they have proven who they are, must still be configured on a per-application basis according to the principle of least privilege.

Common SSO Protocols and Platforms

Most businesses implement SSO through one of several established identity providers. Microsoft Entra ID, formerly Azure Active Directory, is the most common choice for organizations already using Microsoft 365. Google Workspace offers built-in SSO capabilities for Google-centric environments. Dedicated identity platforms such as Okta and OneLogin provide SSO for organizations that need to connect a diverse mix of applications across multiple ecosystems.

The National Institute of Standards and Technology publishes guidelines on digital identity and access management that inform how these platforms implement authentication. NIST Special Publication 800-63 defines assurance levels for digital authentication and is the benchmark that major identity providers design against. Understanding that your SSO platform adheres to these standards provides confidence that the underlying architecture meets federal security expectations.

Implementation Considerations

Deploying SSO requires an inventory of every application your organization uses and a determination of which ones support SAML, OpenID Connect, or proprietary SSO integration. Most major SaaS platforms support SSO natively, but some charge a premium for it, a pricing practice that security professionals have criticized because it effectively puts better security behind a paywall. Budget for these costs during planning.

You also need to plan for edge cases. Some legacy applications do not support modern SSO protocols and may require a password vault or gateway solution as an intermediary. Contractor and temporary worker access may need different policies than full-time employee access. And you need a clear process for what happens when the identity provider itself experiences downtime, because a centralized authentication system means a single point of failure if not properly designed with redundancy.

The User Experience Advantage

Beyond security, SSO delivers a measurable productivity benefit. Employees spend less time logging in, less time resetting forgotten passwords, and less time waiting for IT to unlock accounts. Research from Gartner estimates that password-related issues account for 30 to 50 percent of all help desk calls at organizations without centralized identity management. SSO dramatically reduces this volume, freeing IT staff to focus on higher-value work.

The experience improvement also extends to onboarding. When a new employee is provisioned in the identity provider and assigned to the appropriate groups, they automatically gain access to every application they need on their first day. Without SSO, onboarding involves manually creating accounts in each application, a process that typically takes days and often results in new hires sitting idle while they wait for access to the tools they need.

Evaluating Whether SSO Is Right for Your Business

SSO is appropriate for virtually any organization that uses more than a handful of cloud applications, which today includes nearly every business. The relevant questions are not whether to implement SSO but which identity provider fits your existing infrastructure, which applications to connect first, and how to phase the rollout to minimize disruption. Start with your most widely used applications, ensure MFA is enforced at the identity provider, and expand from there.

The Federal Trade Commission recommends that businesses implement reasonable security measures proportional to the sensitivity of the data they handle. For most organizations, centralized identity management through SSO is one of the most impactful steps they can take toward meeting that standard while simultaneously making their employees’ daily work easier.

Single sign-on is one of the rare investments that improves both security and user experience at the same time. Contact We Solve Problems to evaluate your current identity management approach and implement SSO that protects your business without adding friction to your team’s workday.