{"id":3747,"date":"2025-12-24T10:00:03","date_gmt":"2025-12-24T15:00:03","guid":{"rendered":"https:\/\/www.mymiller.name\/wordpress\/?p=3747"},"modified":"2025-12-24T10:00:03","modified_gmt":"2025-12-24T15:00:03","slug":"secure-your-secrets-encrypting-values-with-spring-cloud-config","status":"publish","type":"post","link":"https:\/\/www.mymiller.name\/wordpress\/spring_config\/secure-your-secrets-encrypting-values-with-spring-cloud-config\/","title":{"rendered":"Secure Your Secrets: Encrypting Values with Spring Cloud Config"},"content":{"rendered":"\n

In the world of microservices, Spring Cloud Config provides a centralized way to manage externalized configurations for your applications. But what about sensitive data like database passwords or API keys? That\u2019s where encryption comes in. This blog post will guide you through the process of encrypting your sensitive values using Spring Cloud Config.<\/p>\n

Why Encrypt?<\/strong><\/p>\n

Storing sensitive data in plain text within your configuration files is a major security risk. Encryption ensures that even if your configuration repository is compromised, the sensitive information remains protected.<\/p>\n

Steps to Enable Encryption:<\/strong><\/p>\n

    \n
  1. \n

    Set Up Your Config Server:<\/strong><\/p>\n

      \n
    • \n

      Add the spring-cloud-config-server<\/code> dependency to your project.<\/p>\n<\/li>\n

    • \n

      Configure your server to point to your configuration repository (e.g., Git).<\/p>\n<\/li>\n

    • \n

      Enable encryption by setting the encrypt.enabled<\/code> property to true<\/code> in your application.properties<\/code> or application.yml<\/code> file.<\/p>\n

      encrypt:\n  enabled: true\n<\/code><\/pre>\n<\/li>\n<\/ul>\n<\/li>\n
    • \n
      Choose an Encryption Method:<\/strong><\/p>\n
        \n
      • \n
        Symmetric Encryption:<\/strong> Uses a single secret key for both encryption and decryption. This is simpler to set up but requires securely managing the key. You can set the key using the encrypt.key<\/code> property.<\/p>\n
        encrypt.key: your-secret-key\n<\/code><\/pre>\n<\/li>\n
      • \n
        Asymmetric Encryption:<\/strong> Uses a public key for encryption and a private key for decryption. This offers better security but is more complex to manage. Here\u2019s how to set it up:<\/p>\n
          \n
        • \n
          Generate a Key Pair:<\/strong> Use the keytool<\/code> command-line utility to generate an RSA key pair.<\/p>\n
          keytool -genkeypair -alias config-server -keyalg RSA -keystore config-server.jks -storepass password\n<\/code><\/pre>\n
          This command generates a keystore file named config-server.jks<\/code> with the alias config-server<\/code> secured by the password \u201cpassword\u201d. You\u2019ll be prompted to provide additional information for the key pair.<\/p>\n<\/li>\n
        • \n
          Configure the Config Server:<\/strong> In your application.properties<\/code> or application.yml<\/code> file, specify the keystore location, alias, and passwords.<\/p>\n
          encrypt:\n  keyStore:\n    location: config-server.jks \n    password: password\n    alias: config-server\n    secret: password \n<\/code><\/pre>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n
        • \n
          Encrypt Your Values:<\/strong><\/p>\n
            \n
          • Using the Config Server Endpoints:<\/strong>\n
              \n
            • Send a POST request to the \/encrypt<\/code> endpoint of your config server with the value you want to encrypt in the request body.<\/li>\n
            • The response will contain the encrypted value.<\/li>\n<\/ul>\n<\/li>\n
            • Using the spring<\/code> CLI:<\/strong>\n
                \n
              • Use the spring encrypt<\/code> command to encrypt values from your command line. You can specify the keystore details here as well.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n
              • \n
                Store Encrypted Values:<\/strong><\/p>\n
                  \n
                • \n
                  Replace the plain text values in your configuration files with the encrypted values. Prefix the encrypted values with {cipher}<\/code>.<\/p>\n
                  spring:\n  datasource:\n    password: '{cipher}encrypted-password'\n<\/code><\/pre>\n<\/li>\n<\/ul>\n<\/li>\n
                • \n
                  Access Encrypted Values in Your Applications:<\/strong><\/p>\n
                    \n
                  • Add the spring-cloud-config-client<\/code> dependency to your client applications.<\/li>\n
                  • The config client will automatically decrypt the values when fetching them from the config server.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n
                    Example:<\/strong><\/p>\n
                    Let\u2019s say you have a database password in your application.yml<\/code> file:<\/p>\n
                    spring:\n  datasource:\n    password: mysecretpassword\n<\/code><\/pre>\n
                      \n
                    1. \n
                      Encrypt the password (using the \/encrypt<\/code> endpoint):<\/strong><\/p>\n
                      curl -X POST localhost:8888\/encrypt -d mysecretpassword\n<\/code><\/pre>\n
                      This will return the encrypted value:<\/p>\n
                      {cipher}6b...encrypted-value...8f\n<\/code><\/pre>\n<\/li>\n
                    2. \n
                      Update your application.yml<\/code>:<\/strong><\/p>\n
                      spring:\n  datasource:\n    password: '{cipher}6b...encrypted-value...8f'\n<\/code><\/pre>\n<\/li>\n<\/ol>\n
                      Now, your client application will receive the decrypted password when it fetches the configuration from the config server.<\/p>\n
                      Security Best Practices:<\/strong><\/p>\n
                        \n
                      • Strong Keys:<\/strong> Use strong and unique keys for encryption.<\/li>\n
                      • Key Management:<\/strong> Securely store and manage your encryption keys. Consider using a dedicated key management solution, especially for production environments.<\/li>\n
                      • Regular Key Rotation:<\/strong> Rotate your keys periodically to enhance security.<\/li>\n<\/ul>\n
                        By following these steps, you can leverage Spring Cloud Config\u2019s encryption capabilities to secure your sensitive data and build more robust and secure microservices.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":3748,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[433],"tags":[69,319],"series":[],"class_list":["post-3747","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-spring_config","tag-java-2","tag-spring"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/www.mymiller.name\/wordpress\/wp-content\/uploads\/2024\/10\/security-5726869_1280-jpg.avif","jetpack-related-posts":[{"id":3689,"url":"https:\/\/www.mymiller.name\/wordpress\/spring_config\/spring-cloud-config-encryption-securing-your-sensitive-data\/","url_meta":{"origin":3747,"position":0},"title":"Spring Cloud Config Encryption: Securing Your Sensitive Data","author":"Jeffery Miller","date":"November 18, 2025","format":false,"excerpt":"In the realm of modern application development, the security of sensitive data, such as database credentials, API keys, and third-party service configurations, is paramount. 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