In GCP, each data chunk written to a storage system is encrypted with a data encryption key. The key is kept close to the data that it encrypts to ensure low latency when retrieving the key. How does GCP protect the data encryption key so that an attacker who gained access to the storage system storing the key could not use it to decrypt the data chunk?

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In GCP, each data chunk written to a storage system is encrypted with a data encryption key. The key is kept close to the data that it encrypts to ensure low latency when retrieving the key. How does GCP protect the data encryption key so that an attacker who gained access to the storage system storing the key could not use it to decrypt the data chunk?