Integration Object Security

According to documentation of the integration object "Integrations can be used to make HTTP requests from Appian to external systems, including to REST web services.".

If the "URL" of the external system we are trying to connect to is "HTTPS", would that make the connection secure?

We are using Method POST. Authentication None. There's a token in our headers. We are encoding sensitive documents in base64 and sending it off to an external system in the body of the request. 

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