EnricoMi commented on code in PR #46017:
URL: https://github.com/apache/arrow/pull/46017#discussion_r2037697271


##########
cpp/src/parquet/encryption/read_configurations_test.cc:
##########
@@ -103,9 +103,9 @@ class TestDecryptionConfiguration
   // This vector will hold various decryption configurations.
   std::vector<std::shared_ptr<parquet::FileDecryptionProperties>>
       vector_of_decryption_configurations_;
-  std::string kFooterEncryptionKey_ = std::string(kFooterEncryptionKey);
-  std::string kColumnEncryptionKey1_ = std::string(kColumnEncryptionKey1);
-  std::string kColumnEncryptionKey2_ = std::string(kColumnEncryptionKey2);
+  SecureString kFooterEncryptionKey_ = kFooterEncryptionKey;

Review Comment:
   Doesn't that hold for all `k...` members in this class 
(`TestDecryptionConfiguration`) and `TestEncryptionConfiguration` as well? Is 
it worth it given this are tests?



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