Security and authorisation

Learn how we handle security and authorisation for our APIs.

Overview

Many of our APIs give access to sensitive or personal data. This page explains the various techniques or 'patterns' we use to keep them secure.

Security concepts

Systems and users

There are three parties involved in API security:

the API itself - more accurately, the system exposing the API
the calling application - the system consuming the API
the end user - a healthcare worker or a patient, or possibly not present

Authentication and authorisation

Authentication means verifying an identity:

user authentication - is the end user who they say they are?
system authentication - is the calling application who it says it is?

Authorisation means verifying access rights:

user authorisation - is the end user allowed to use that function in the calling application?
system authorisation - is the calling application allowed to call that API?

Different APIs use different methods for authentication and authorisation.

Assurance

For some of our APIs, we rely on the calling application to handle user authentication and authorisation.

You must do this before we'll allow you to go live. This is part of our onboarding process. We might also ask you to conduct penetration testing to prove your application is secure.

For some of our APIs, we use modern standards to reduce your assurance burden. For example, we use OAuth 2.0 to allow the end user to authenticate directly with us.

Role-based access control (RBAC)

Some of our APIs require you to use role-based access control (RBAC) for user authorisation. RBAC consists of:

roles, such as doctor or nurse
activities, such as read or update patient demographic details
permissions, linking roles to activities

In some cases, we allow you to use your own RBAC system. In other cases, we require you to implement National RBAC - a specific set of roles, activities and permissions defined by us.

For more details, see National RBAC for developers.

Keep your software secure

As a software developer, you will undertake many design activities that build security in each layer of your application. When you connect to NHS England APIs you have a responsibility to:

keep credentials, keys and secrets secure
understand the importance of tokens
rotate your keys and credentials regularly

For more details, see Keep your software secure.

Security patterns

Each API uses a security ‘pattern’ appropriate to its needs. The patterns group into three categories:

open-access APIs
application-restricted APIs
user-restricted APIs

The following sections describe the patterns in more detail.

You can find out which security pattern applies to a particular API in the API and integration catalogue.

Open-access APIs

Some of our APIs are open-access, which means:

we do not authenticate or authorise the calling application
we do not authenticate or authorise the end user - they might not even be present

Here's an illustration:

We generally use open-access APIs for public data, where security is not a concern.

Our open-access APIs are generally RESTful APIs. For more details on how to access them, see our open-access REST API tutorial.

Application-restricted APIs

Some of our APIs are application-restricted, which means:

we authenticate and authorise the calling application
we do not authenticate or authorise the end user

Although we do not authenticate or authorise the end user, for some APIs we do require the calling application to do it 'locally'. For other APIs we do not require the end user to be authenticated or authorised, or even to be present.

Here's an illustration:

We support the following security patterns for application-restricted APIs:

Application-restricted RESTful API - API key authentication

Use this pattern when:

accessing an application-restricted RESTful API
the API uses API key authentication

In this pattern, you authenticate your application by including an API key with each API request. The API key is unique to your application.

For more details, including detailed technical integration instructions, see Application-restricted RESTful APIs - API key authentication.

Application-restricted RESTful API - signed JWT authentication

Use this pattern when:

accessing an application-restricted RESTful API
the API uses signed JWT authentication

In this pattern, you authenticate your application by sending a signed JSON Web Token (JWT) to our OAuth 2.0 authorisation server. You provide us with your public key and sign the JWT with your private key. In return, we give you an access token, which you then include with each API request.

This pattern is more secure than API key authentication - we use it for APIs that involve personal or sensitive data.

For more details, including detailed technical integration instructions, see Application-restricted RESTful APIs - signed JWT authentication.

Application-restricted API - TLS-MA authentication

Use this pattern when:

accessing an application-restricted API
the API uses TLS-MA authentication

In this pattern, we issue you with a TLS-MA certificate that is unique to your application. You authenticate your application by including the TLS-MA certificate with each API request.

We use this pattern for some of our older APIs.

For more details, including detailed technical integration instructions, contact us.

User-restricted APIs

Some of our APIs are user-restricted, which means:

we authenticate and authorise the calling application
we authenticate, but do not authorise, the end user

Although we do not authorise the end user, we do generally require the calling application to do it ‘locally’.

Here's an illustration:

Two types of users can access the user-restricted APIs:

healthcare workers - authenticated using Care Identity Service (CIS)
patients - authenticated using NHS login

Healthcare worker access mode

If the end user is a healthcare worker, we support the following user-restricted security patterns:

User-restricted RESTful API - CIS2 separate authentication and authorisation

Use this pattern when:

accessing a user-restricted RESTful API
the end user is a healthcare worker
you want to separate authentication from authorisation
you need the end user's identity information

In this pattern, authentication and authorisation are done separately. You might authenticate the user when they sign in but only get authorisation to call the API if and when you need it. You do authentication directly with CIS2 Authentication and then separately do authorisation with our OAuth 2.0 authorisation service. You need to register your application separately with the API Platform and with CIS2.

The end user authenticates with either an NHS smartcard or a modern alternative.

For more details, including detailed technical integration instructions, see User-restricted RESTful APIs - CIS2 separate authentication and authorisation.

User-restricted RESTful API - CIS2 combined authentication and authorisation

Use this pattern when:

accessing a user-restricted RESTful API
the end user is a healthcare worker
you want a simpler integration
you don't need the end user's identity information

In this pattern, authentication and authorisation are done together. Authentication is done by CIS2 Authentication but we co-ordinate that under the covers behind our OAuth 2.0 authorisation server. Your application only needs to be registered with the API Platform, not CIS2.

The end user authenticates with either an NHS smartcard or a modern alternative.

For more details, including detailed technical integration instructions, see User-restricted RESTful APIs - CIS2 combined authentication and authorisation.

User-restricted HL7 V3 API - CIS2

Use this pattern when:

accessing an HL7 V3 API
the end user is a healthcare worker

In this pattern, you use CIS2 to authenticate the end user.

For more details, including detailed technical integration instructions, see CIS2 Authentication.

You can also update your application to migrate APIs from CIS1 to CIS2.

User-restricted HL7 V3 API - CIS1

Use this pattern when:

accessing an HL7 V3 API
the end user is a healthcare worker
you already use CIS1 for authentication and do not want to migrate to CIS2

In this pattern, you use CIS1 to authenticate the end user.

For more details, see CIS1 Authentication.

You can also update your application to use CIS2 alongside older APIs.

Some of our APIs need healthcare workers to be authorised by using the national role-based access control (RBAC).

Patient access mode

If the end user is a patient, we support the following user-restricted security patterns:

User-restricted RESTful API - using NHS login - separate authentication and authorisation

Use this pattern when:

accessing a user-restricted RESTful API
the end user is a patient registered at a GP practice in England, or is receiving NHS services in England
you want to separate authentication from authorisation

In this pattern, authentication and authorisation are done separately. You can authenticate the user when they sign in but only get authorisation to call the API if and when you need it. You do authentication directly with NHS login and then separately do authorisation with our OAuth2.0 authorisation service. You need to register your application separately with NHS login and with the API Platform.

For more details, including detailed technical integration instructions, see User-restricted RESTful API - NHS login separate authentication and authorisation.

Last edited: 28 May 2025 12:48 pm