[[["わかりやすい","easyToUnderstand","thumb-up"],["問題の解決に役立った","solvedMyProblem","thumb-up"],["その他","otherUp","thumb-up"]],[["わかりにくい","hardToUnderstand","thumb-down"],["情報またはサンプルコードが不正確","incorrectInformationOrSampleCode","thumb-down"],["必要な情報 / サンプルがない","missingTheInformationSamplesINeed","thumb-down"],["翻訳に関する問題","translationIssue","thumb-down"],["その他","otherDown","thumb-down"]],["最終更新日 2025-07-31 UTC。"],[],[],null,["# Data encryption options\n\nCloud Storage always encrypts your data on the server side, before it is\nwritten to disk, at no additional charge. Besides this\n[standard, Cloud Storage behavior](/storage/docs/encryption/default-keys), there are additional ways to\nencrypt your data when using Cloud Storage. Below is a summary of the\nencryption options available to you:\n\n*Server-side encryption*: Encryption that occurs after Cloud Storage\nreceives your data, but before the data is written to disk and stored.\n\n- [*Customer-managed encryption keys* (CMEK)](/storage/docs/encryption/customer-managed-keys): You can create and manage\n your encryption keys through [Cloud Key Management Service](/security-key-management). CMEK can be stored as\n software keys, in an [HSM cluster](/kms/docs/hsm), or [externally](/kms/docs/ekm).\n\n- [*Customer-supplied encryption keys* (CSEK)](/storage/docs/encryption/customer-supplied-keys): You can create and manage\n your own encryption keys. These keys act as an additional encryption layer on\n top of the standard Cloud Storage encryption.\n\n[*Client-side encryption*](/storage/docs/encryption/client-side-keys): Encryption that occurs before data is sent to\nCloud Storage. Such data arrives at Cloud Storage already\nencrypted but also undergoes server-side encryption.\n| **Warning:** If you use customer-supplied encryption keys or client-side encryption, you must securely manage your keys and ensure that they are not lost. If you lose your keys, you are no longer able to read your data, and you continue to be charged for storage of your objects until you delete them.\n\nComparing encryption options\n----------------------------"]]