Implement end-to-end encryption for all files and data, both in transit and at rest, to ensure confidentiality and integrity.

Define and enforce strict security requirements for the service, including role-based access control, data classification policies, and periodic security audits to mitigate risks.

Deploy advanced network security solutions and endpoint protection tools to safeguard the infrastructure used for accessing the file sharing service.

Assume the cloud service provider's default security settings are sufficient and avoid additional configurations to minimize complexity.