Object Storage has features are typically minimal, allowing you to only store, retrieve, copy, and delete files as well as the ability to control which users can undertake these actions.

One of the better-known categories heavily used in cloud security is Federated Identity Brokers. These services help intermediate IAM between an organization's existing identity providers(internal Security Guidance v4.0 Copyright2017. Cloud Security Alliance. All rights reserved or cloud-hosted directories) and the many different cloud services used by the organization. They can provide web-based Single Sign
0n(SS0). helping ease some of the complexity of connecting to a wide range of external services that use different federation configurations.
Reference: CSA Security Guidelines V.4(reproduced here for the educational purpose)

It is false.
Customer will have to take permission and give notification to cloud service provider.
The cloud owner (public or private) will typically require notification of assessments and place limits on the nature of assessments. This is because they may be unable to distinguish an assessment from a real attack without prior warning.
Ref: CSA Security Guidelines V4.0

Remember, two key considerations when doing key management
1) Do not save it alongside data
2) Do not let cloud service provider manage the keys