'What is the difference of credential-store and secret-key-credential-store

In the following table the different credential store implementations of different credential types are listed.

Credential Type KeyStoreCredentialStore PropertiesCredentialStore
PasswordCredential Supported Unsupported
KeyPairCredential Supported Unsupported
SecretKeyCredential Supported Supported

I still do not quite understand the difference of KeyStoreCredentialStore (credential-store) and PropertiesCredentialStore (secret-key-credential-store) in wildfly subsystem elytron. If KeyStoreCredentialStore supports SecretKeyCredential, why one need PropertiesCredentialStore type?



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