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Encrypting or Decrypting Small Volumes of Data
Encrypting or Decrypting Small Volumes of Data
Updated on 2023-03-02 GMT+08:00
Scenario
You can use online tools on the Key Management Service (KMS) console or call the necessary KMS APIs to directly encrypt or decrypt small-size data with a CMK, such as passwords, certificates, or phone numbers.
Restrictions
Currently, a maximum of 4 KB of data can be encrypted or decrypted in this way.
Encryption and Decryption Using Online Tools
- Encrypting data
- Click the alias of the desired CMK to view its details, and go to the online tool for data encryption and decryption.
- Click Encrypt. In the text box on the left, enter the data to be encrypted. For details, see Figure 1.
- Click Execute. Ciphertext of the data is displayed in the text box on the right.
NOTE:
- Use the current CMK to encrypt the data.
- You can click Clear to clear the entered data.
- You can click Copy to Clipboard to copy the ciphertext and save it in a local file.
- Decrypting data
- You can click any CMK in Enabled status to go to the encryption and decryption page of the online tool.
- Click Decrypt. In the text box on the left, enter the data to be decrypted. For details, see Figure 2.
NOTE:
- The tool will identify the original encryption CMK and use it to decrypt the data.
- However, if the CMK has been deleted, the decryption fails.
- Click Execute. Plaintext of the data is displayed in the text box on the right.
NOTE:
You can click Copy to Clipboard to copy the plaintext and save it in a local file.
Calling APIs for Encryption and Decryption
Figure 3 shows an example about how to call KMS APIs to encrypt and decrypt an HTTPS certificate.
The procedure is as follows:
- Create a CMK on KMS.
- Call the encrypt-data interface of KMS and use the CMK to encrypt the plaintext certificate.
- Deploy the certificate onto a server.
- The server uses the decrypt-data interface of KMS to decrypt the ciphertext certificate.
Parent topic: Using KMS to Encrypt Offline Data
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