EnricoMi commented on code in PR #46017:
URL: https://github.com/apache/arrow/pull/46017#discussion_r2039448453


##########
cpp/src/parquet/encryption/encryption.h:
##########
@@ -327,19 +322,19 @@ class PARQUET_EXPORT FileDecryptionProperties {
   }
 
  private:
-  std::string footer_key_;
+  encryption::SecureString footer_key_;
   std::string aad_prefix_;
   std::shared_ptr<AADPrefixVerifier> aad_prefix_verifier_;
 
-  const std::string empty_string_ = "";
+  const encryption::SecureString empty_string_ = encryption::SecureString("");

Review Comment:
   Still needed, improved name.



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