[[["容易理解","easyToUnderstand","thumb-up"],["確實解決了我的問題","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["難以理解","hardToUnderstand","thumb-down"],["資訊或程式碼範例有誤","incorrectInformationOrSampleCode","thumb-down"],["缺少我需要的資訊/範例","missingTheInformationSamplesINeed","thumb-down"],["翻譯問題","translationIssue","thumb-down"],["其他","otherDown","thumb-down"]],["上次更新時間：2025-09-04 (世界標準時間)。"],[],[],null,["# Server-side encryption\n======================\n\nFirestore automatically encrypts all data before it is written to disk.\nThere is no setup or configuration required and no need to modify the way you\naccess the service. The data is automatically and transparently decrypted when\nread by an authorized user.\n\nKey management\n--------------\n\nWith server-side encryption, you can either let Google manage cryptographic keys on your\nbehalf or use customer-managed encryption keys (CMEK) to manage the keys\nyourself.\n\nBy default, Google manages cryptographic keys on your\nbehalf using the same hardened key management systems that we use for our own\nencrypted data, including strict key access controls and auditing. Each\nFirestore object's data and metadata is [encrypted](/docs/security/encryption/default-encryption) and each\nencryption key is itself encrypted with a regularly rotated set of master keys.\n\nFor information about managing keys yourself, see\n[CMEK for Firestore](/firestore/docs/cmek).\n\nClient-side encryption\n----------------------\n\nServer-side encryption can be used in combination with client-side encryption.\nIn client-side encryption, you manage your own encryption keys and encrypt data\nbefore writing it to Firestore. In this case, your data is\nencrypted twice, once with your keys and once with the server-side keys.\n| **Warning:** Firestore does not know if your data has already been encrypted client-side, nor does Firestore have any knowledge of your client-side encryption keys. If you use client-side encryption, you must securely manage your encryption keys.\n\nTo protect your data as it travels over the Internet during read and write\noperations, we use Transport Layer Security (TLS). For more information about\nthe supported TLS versions, see [Encryption in transit in Google Cloud](/docs/security/encryption-in-transit#user_to_google_front_end_encryption).\n\nWhat's next\n-----------\n\nFor more information about encryption at rest for Firestore and\nother Google Cloud products, see [Encryption at Rest in Google Cloud](/docs/security/encryption/default-encryption)."]]
