---
title:  Authentication
---

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A client is authenticated when it connects with valid credentials to a <%=vars.product_name%> cache server that is configured with the client authentication callback.
For details on the server's role in authentication and what it expects from the client, see [Implementing Authentication](<%=vars.serverman%>/managing/security/implementing_authentication.html) in the *<%=vars.product_name%> User Guide*.

In your application, authentication credentials must be set when creating the cache. In practice,
this means setting the authentication credentials when you create the CacheFactory.

### C++ Authentication Example

In this C++ authentication example, the `CacheFactory` creation process sets the authentication callback:

```cpp
  auto cache = CacheFactory()
      .set("log-level", "none")
      .setAuthInitialize(std::unique_ptr<ExampleAuthInitialize>(new ExampleAuthInitialize()))
      .create();
```

Credentials are implemented in the `getCredentials` member function of the `ExampleAuthInitialize`, which is derived from the `AuthInitialize` abstract class.

```cpp
std::shared_ptr<Properties> ExampleAuthInitialize::getCredentials(
    const std::shared_ptr<Properties>& securityprops,
    const std::string& /*server*/) {

  securityprops->insert("security-username", "root");
  securityprops->insert("security-password", "root");

  return securityprops;
}
```