For secure data uploads from third parties while optimizing processing speed, what infrastructure should be put in place?

Providing a Cloud Storage bucket for uploads and implementing IAM access management is the optimal approach for secure data uploads from third parties while also optimizing processing speed.

Cloud Storage is a highly scalable and durable solution within Google Cloud, designed specifically for storing and accessing large amounts of data efficiently. By leveraging a Cloud Storage bucket, third parties can reliably upload their data, and the inherent scalability of Cloud Storage ensures that this process can handle varying loads without impacting performance.

Implementing Identity and Access Management (IAM) allows for secure access control, ensuring that only authorized users or systems can upload data to the bucket. This access management is vital for maintaining data security, as it restricts access to sensitive data to those who are permitted to interact with it. IAM roles can be tailored specifically for third parties, ensuring minimal necessary permissions for uploads, thus balancing security and functional accessibility.

This combination of using Cloud Storage with IAM provides a secure yet efficient method for handling data uploads compared to the other options, which either reduce processing efficiency or do not adequately maintain secure data transfer.