- What's New
- Function Overview
- Service Overview
- Getting Started
-
User Guide
- Key Management Service
- Cloud Secret Management Service
- Key Pair Service
- Dedicated HSM
- Auditing Logs
- Permission Control
- Best Practices
-
API Reference
- Before You Start
- Calling APIs
- API Overview
- APIs
- Application Examples
- Permissions Policies and Supported Actions
- Appendix
- Change History
- SDK Reference
-
FAQs
-
KMS Related
- What Is Key Management Service?
- What Is a Customer Master Key?
- What Is a Default Key?
- What Are the Differences Between a Custom Key and a Default Key?
- What Is a Data Encryption Key?
- Why Cannot I Delete a CMK Immediately?
- Which Cloud Services Can Use KMS for Encryption?
- How Do Huawei Cloud Services Use KMS to Encrypt Data?
- What Are the Benefits of Envelope Encryption?
- Is There a Limit on the Number of Custom Keys That I Can Create on KMS?
- Can I Export a CMK from KMS?
- Can I Decrypt My Data if I Permanently Delete My Custom Key?
- How Do I Use the Online Tool to Encrypt or Decrypt Small Volumes of Data?
- Can I Update CMKs Created by KMS-Generated Key Materials?
- How Are Default Keys Generated?
- What Should I Do If I Do Not Have the Permissions to Perform Operations on KMS?
- Why Can't I Wrap Asymmetric Keys by Using -id-aes256-wrap-pad in OpenSSL?
- Key Algorithms Supported by KMS
- What Should I Do If KMS Failed to Be Requested and Error Code 401 Is Displayed?
- CSMS Related
-
KPS Related
- How Do I Create a Key Pair?
- What Are a Private Key Pair and an Account Key Pair?
- How Do I Handle an Import Failure of a Key Pair Created Using PuTTYgen?
- What Should I Do When I Fail to Import a Key Pair Using Internet Explorer 9?
- How Do I Log In to a Linux ECS with a Private Key?
- How Do I Use a Private Key to Obtain the Password to Log In to a Windows ECS?
- How Do I Handle the Failure in Binding a Key Pair?
- How Do I Handle the Failure in Replacing a Key Pair?
- How Do I Handle the Failure in Resetting a Key Pair?
- How Do I Handle the Failure in Unbinding a Key Pair?
- Do I Need to Restart Servers After Replacing Its Key Pair?
- How Do I Enable the Password Login Mode for an ECS?
- How Do I Handle the Failure in Logging In to ECS After Unbinding the Key Pair?
- What Should I Do If My Private Key Is Lost?
- How Do I Convert the Format of a Private Key File?
- Can I Change the Key Pair of a Server?
- Can a Key Pair Be Shared by Multiple Users?
- How Do I Obtain the Public or Private Key File of a Key Pair?
-
Dedicated HSM Related
- What Is Dedicated HSM?
- How Does Dedicated HSM Ensure the Security for Key Generation?
- Do Equipment Room Personnel Has the Super Administrator Role to Steal Information by Using a Privileged UKey?
- What HSMs Are Used for Dedicated HSM?
- What APIs Does Dedicated HSM Support?
- How Do I Enable Public Access to a Dedicated HSM Instance?
- Pricing
- General
- Change History
-
KMS Related
- Videos
Show all
What Are the Benefits of Envelope Encryption?
Envelope encryption is the practice of encrypting data with a DEK and then encrypting the DEK with a root key that you can fully manage. In this case, CMKs are not required for encryption or decryption.
Benefits:
- Advantages over CMK encryption in KMS
Users can use CMKs to encrypt and decrypt data on the KMS console or by calling KMS APIs.
A CMK can encrypt and decrypt data no more than 4 KB. An envelope can encrypt and decrypt larger volumes of data.
Data encrypted using envelopes does not need to be transferred. Only the DEKs need to be transferred to the KMS server.
- Advantages over encryption by using cloud services
- Security
Data transferred to the cloud for encryption is exposed to risks such as interception and phishing.
During envelope encryption, KMS uses Hardware Security Modules (HSMs) to protect keys. All CMKs are protected by root keys in HSMs to avoid key leakage.
- Trustworthiness
You will worry about data security on the cloud. It is also difficult for cloud services to prove that they never misuse or disclose such data.
If you choose envelope encryption, KMS will control access to keys and record all usages of and operations on keys with traceable logs, meeting your audit and regulatory compliance requirements.
- Performance and cost
To encrypt or decrypt data using a cloud service, you have to send the data to the encryption server and receive the processed data. This process seriously affects your service performance and incurs high costs.
Envelope encryption allows you to generate DEKs online by calling KMS cryptographic algorithm APIs, and to encrypt a large amount of local data with the DEKs.
- Security
Feedback
Was this page helpful?
Provide feedbackThank you very much for your feedback. We will continue working to improve the documentation.