ggershinsky commented on PR #41821:
URL: https://github.com/apache/arrow/pull/41821#issuecomment-2146577953

   > > ~ a billion crypto operations (meaning a billion parquet pages)
   > 
   > Out of curiosity, what is the underlying cause?
   
   The AES GCM math - when an attacker has 2^32 blocks, encrypted with the same 
key (and random nonces) - the key can be derived from this information. Since 
the vast majority of blocks in a parquet files are the page headers and the 
pages, the limit is a couple of billion of data pages.


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