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+
+# Test data files for Parquet compatibility and regression testing
+
+| File  | Description |
+|---|---|
+| delta_binary_packed.parquet | INT32 and INT64 columns with DELTA_BINARY_PACKED encoding. See [delta_binary_packed.md](delta_binary_packed.md) for details. |
+| nested_structs.rust.parquet | Used to test that the Rust Arrow reader can lookup the correct field from a nested struct. See [ARROW-11452](https://issues.apache.org/jira/browse/ARROW-11452) |
+
+TODO: Document what each file is in the table above.
+
+## Encrypted Files
+
+Tests files with .parquet.encrypted suffix are encrypted using Parquet Modular Encryption.
+
+A detailed description of the Parquet Modular Encryption specification can be found here:
+```
+ https://github.com/apache/parquet-format/blob/encryption/Encryption.md
+```
+
+Following are the keys and key ids (when using key\_retriever) used to encrypt the encrypted columns and footer in the all the encrypted files:
+* Encrypted/Signed Footer:
+  * key:   {0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5}
+  * key_id: "kf"
+* Encrypted column named double_field:
+  * key:  {1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,0}
+  * key_id: "kc1"
+* Encrypted column named float_field:
+  * key: {1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,1}
+  * key_id: "kc2"
+
+The following files are encrypted with AAD prefix "tester":
+1. encrypt\_columns\_and\_footer\_disable\_aad\_storage.parquet.encrypted
+2. encrypt\_columns\_and\_footer\_aad.parquet.encrypted
+
+
+A sample that reads and checks these files can be found at the following tests:
+```
+cpp/src/parquet/encryption-read-configurations-test.cc
+cpp/src/parquet/test-encryption-util.h
+```