An optional parameter to set the Customer-Supplied Encryption key.
Application developers can generate their own encryption keys to protect the data in GCS. This is known as a Customer-Supplied Encryption key (CSEK). If the application provides a CSEK, GCS does not retain the key. The object data, the object CRC32 checksum, and its MD5 hash (if applicable) are all encrypted with this key, and the key is required to read any of these elements back.
Care must be taken to save and protect these keys, if lost, the data is not recoverable. Also, applications should avoid generating predictable keys, as this weakens the encryption.
This option is used in read (download), write (upload), copy, and compose operations. Note that copy and compose operations use the same key for the source and destination objects.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-04-22 UTC."],[[["This document outlines the `EncryptionKey` structure within the Google Cloud Storage C++ client library, covering versions from 2.11.0 up to the latest release candidate 2.37.0-rc."],["The `EncryptionKey` structure is used to implement Customer-Supplied Encryption Keys (CSEK) to protect data stored in Google Cloud Storage (GCS) where GCS does not retain the key."],["Users must manage and safeguard their CSEKs as data cannot be recovered if keys are lost or if predictable keys are utilized, weakening the encryption."],["The document details the functionality to create encryption keys from a binary key or from a key in base64 format, and these keys are utilized in read, write, copy, and compose operations in GCS."],["The provided documentation includes a link to a more detailed description of how Customer-Supplied Encryption keys are utilized within Google Cloud Storage."]]],[]]
