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 2025-04-02 UTC."],[[["This document outlines the `EncryptionKey` structure within the Google Cloud Storage C++ client library, focusing on various versions from 2.11.0 to the latest release candidate 2.37.0-rc."],["Customer-Supplied Encryption Keys (CSEK) allow application developers to encrypt data in Google Cloud Storage (GCS) using their own keys, which are not retained by GCS."],["CSEK must be carefully stored, because if lost, the data cannot be recovered, and predictable keys should be avoided as they compromise encryption strength."],["The `EncryptionKey` structure supports the creation of encryption keys from both binary and base64-encoded keys, with each method expecting exactly 32 bytes of data."],["The application of these keys are used in operations such as read, write, copy, and compose and can be used for source and destination objects."]]],[]]
