What Is Single Sign-On and How Does It Work?

Imagine having to remember countless usernames and passwords for every website and application you use – it can quickly become a frustrating and overwhelming experience. This is where Single Sign-On (SSO) comes to the rescue. 

With single sign-on (SSO), you can securely access multiple applications and services with single credentials, providing contextual access based on your role and permissions. In this article, we’ll explore what SSO is, how it works, and its benefits.

Understanding Single Sign-On

Single Sign-On, or SSO, is a system that lets people safely log in to multiple websites and apps with just one set of login credentials. It is widely used in business contexts, where users need to access various software-as-a-service (SaaS) applications managed by an internal IT team. SSO is also beneficial for remote workers who use multiple SaaS applications.

How Does Single Sign-On Work?

Single Sign-On works when a programme (called the Single Sign-on provider) and an account provider build trust with each other. Most of the time, this trust is built when the identity provider and the service provider trade certificates. 

Here’s a typical SSO login flow:

1. An individual tries to access a website (the service provider).
2. The service provider sends a token containing the user’s information (e.g., email address or username) to the SSO system (the identity provider) as part of a request.
3. It is checked by the identity provider to see if the person has already been verified.  If so, it grants the user access to the service provider application.
4. If the user hasn’t logged in, they will be prompted to provide the required credentials (e.g., username and password or multi-factor authentication).
5. Once the identity provider checks the details, it gives a token back to the service provider to let them know that the authentication worked.
6. The token is passed through the user’s browser to the service provider.
7. The service provider validates the token based on the trust relationship established with the identity provider during the initial configuration.
8. The user is granted access to the service provider.

Benefits of Single Sign-On Solutions

1. Improved Security: SSO encourages users to create and use stronger passwords since they only have to remember one set of credentials. It also eliminates the need to reuse passwords across multiple services, reducing the risk of account compromise.
2. Increased Productivity: By removing the need to remember and enter multiple usernames and passwords, SSO reduces password fatigue and saves time, allowing users to focus on their tasks more efficiently.
3. Centralised Access Management: Administrators can centrally control access requirements, such as password complexity and multi-factor authentication (MFA), across all applications and services integrated with the Single Sign-On solution.
4. Reduced Help Desk Overhead: SSO reduces the time spent by IT help desks assisting users with lost or forgotten passwords, as users only need to manage a single set of credentials.
5. Better User Experience: SSO provides a seamless and convenient login experience for users, as they can access multiple applications and services without frequently entering their credentials.

Use Cases of Single Sign-On in Applications and Solutions

Single Sign-On is widely used in various applications and solutions, including:

1. SSO is commonly used in organisations to provide secure access to multiple enterprise applications, like CRMs, human resource management (HRM) systems, and project management tools.
2. Many cloud-based services, such as Google Workspace, Microsoft 365, and Salesforce, support SSO integration, allowing users to access these services with their organisational credentials.
3. SSO can be integrated into web applications, enabling users to access multiple websites or portals without re-entering their credentials for each site.
4. With the increasing use of mobile devices, Single Sign-On solutions are also being adopted for mobile applications, providing a seamless login experience across different platforms.

Conclusion

SSO lowers password fatigue, enhances user experience and simplifies access management for organisations by letting users access numerous apps and services with one credential.  In other words, we can say that Single Sign-On streamlines logins and boosts security and efficiency for organisations.