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."],[[["The page documents various versions of the `EncryptionKey` structure, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["`EncryptionKey` allows application developers to use Customer-Supplied Encryption Keys (CSEK) to protect data in Google Cloud Storage, where GCS does not retain the keys."],["The data, checksum, and MD5 hash (if available) are all encrypted with the CSEK, which is required to retrieve any of those elements."],["`EncryptionKey` can be created from either a binary key or a base64-encoded key, both requiring exactly 32 bytes when in binary or when decoded respectively, through the `FromBinaryKey` and `FromBase64Key` static functions."],["The use of CSEK via `EncryptionKey` applies to read, write, copy, and compose operations, and requires careful handling of the keys, as lost keys mean irrecoverable data."]]],[]]
