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 use of Customer-Supplied Encryption Keys (CSEK) for securing data in Google Cloud Storage (GCS), emphasizing that GCS does not retain these keys."],["CSEK usage encrypts object data, the object CRC32 checksum, and its MD5 hash, and the key is required to read these elements back, so care must be taken to protect the key as losing it would make the data unrecoverable."],["The `EncryptionKey` can be created using either a raw binary key (32 bytes) with the `FromBinaryKey` function or a base64-encoded key with the `FromBase64Key` function."],["CSEKs are utilized in various GCS operations, including reading, writing, copying, and composing objects, with the same key used for both source and destination objects during copy and compose operations."],["The document provides links to various versions of the documentation and a link to a detailed explanation of CSEK's in GCS."]]],[]]
