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 page details the Customer-Supplied Encryption Key (CSEK) feature for Google Cloud Storage, where users can manage their own encryption keys."],["CSEK is used in various operations like reading, writing, copying, and composing, and it encrypts object data, CRC32 checksums, and MD5 hashes."],["The document provides links to different versions of the documentation for `EncryptionKey`, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["There are two functions, `FromBinaryKey` and `FromBase64Key`, that create an encryption key from a binary key or base64-encoded key respectively, each requiring exactly 32 bytes."],["The importance of securely saving CSEKs is stressed, as data is unrecoverable if the keys are lost, and users are advised to generate unpredictable keys for security."]]],[]]
