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DocumentaçãoCloud Object StorageData Lake StorageMetadata AcceleratorBig Data SecurityServer-Side Encryption Feature Introduction

Server-Side Encryption Feature Introduction

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Última atualização: 2025-12-22 16:27:37

Overview

A metadata acceleration bucket is a special type of bucket. Its support status, configuration, and method of use for server-side encryption differ from ordinary buckets. For a basic introduction to server-side encryption, please refer to Server-side Encryption Overview.
This document provides detailed information on the variations in server-side encryption between metadata acceleration buckets and ordinary buckets, as well as the method of use for server-side encryption in metadata acceleration buckets.

Server-Side Encryption Support Status

The support status for server-side encryption in buckets and metadata acceleration buckets is as shown in the table below:
Access Method
Server-Side Encryption Type
bucket
metadata acceleration bucket
S3 API
SSE-C
Supported
Not supported
SSE-COS
Supported
Supported
SSE-KMS
Supported
Not supported
HDFS API
SSE-C
Supported
Supported
SSE-COS
Supported
Supported
SSE-KMS
Supported
Supported
Note:
In addition to the differences listed in the above table, metadata acceleration buckets also have two additional usage limits:
Bucket encryption is not supported (see bucket encryption overview), including console configuration and REST API configuration.
Only supports the AES256 encryption algorithm. SM4 encryption algorithm is not supported.

Server-Side Encryption Method of Use

The server-side encryption configuration method for metadata acceleration buckets depends on the API type.
S3 API access: The method to configure the encryption method is the same as for a bucket. See server-side encryption dedicated header to set request header parameters.
HDFS API access: Select the configuration method based on the different clients used (OFS client or COSN client). For details about the two clients, see Client Introduction.

The configuration items listed in the following context need to be added or modified in the Hadoop core-site.xml file. The operation path varies depending on the environment.
Tencent Cloud's EMR product: Operate via the EMR console. For the method to edit the core-site.xml configuration file, see configuration update.
Self-built big data environment: The core-site.xml file is normally located under the $HADOOP_HOME/etc/hadoop directory, depending on the installation method and release version of the big data components.

OFS Client

When using the OFS client, the configuration items for various encryption methods are as follows:

SSE-C Encryption

Configuration Item
Configuration Description
Required
fs.ofs.sse.mode
Specify server encryption method, here is SSE-C
Yes
fs.ofs.sse.c.key
A Base64-encoded AES-256 key, for example MDEyMzQ1Njc4OUFCQ0RFRjAxMjM0NTY3ODlBQkNERUY=
Yes

SSE-COS Encryption

Configuration Item
Configuration Description
Required
fs.ofs.sse.mode
Specify server encryption method, here is SSE-COS
Yes

SSE-KMS Encryption

Configuration Item
Configuration Description
Required
fs.ofs.sse.mode
Specify server encryption method, here is SSE-KMS
Yes
fs.ofs.sse.kms.keyid
Specify the User Master Key (CMK) of KMS. If not specified, use the CMK created by COS by default.
example value: 93866e69-9755-11ef-8e65-52540089bc41
No
fs.ofs.sse.kms.context
Specify the KMS encryption context, with the value being the Base64-encoded JSON-formatted encryption context key-value pair.
example value: eyJrZXkxIjoidmFsdWUxIn0=
No

COSN Client

When using the COSN client, the configuration items for various encryption methods are as follows:

SSE-C Encryption

Configuration Item
Configuration Description
Required
fs.cosn.trsf.fs.ofs.sse.mode
Specify server encryption method, here is SSE-C
Yes
fs.cosn.trsf.fs.ofs.sse.c.key
A Base64-encoded AES-256 key, for example MDEyMzQ1Njc4OUFCQ0RFRjAxMjM0NTY3ODlBQkNERUY=
Yes

SSE-COS Encryption

Configuration Item
Configuration Description
Required
fs.cosn.trsf.fs.ofs.sse.mode
Specify server encryption method, here is SSE-COS
Yes

SSE-KMS Encryption

Configuration Item
Configuration Description
Required
fs.cosn.trsf.fs.ofs.sse.mode
Specify server encryption method, here is SSE-KMS
Yes
fs.cosn.trsf.fs.ofs.sse.kms.keyid
Specify the User Master Key (CMK) of KMS. If not specified, use the CMK created by COS by default.
example value: 93866e69-9755-11ef-8e65-52540089bc41
No
fs.cosn.trsf.fs.ofs.sse.kms.context
Specify the KMS encryption context, with the value being the Base64-encoded JSON-formatted encryption context key-value pair.
example value: eyJrZXkxIjoidmFsdWUxIn0=
No

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