When I wrote about the internal file format of protected spreadsheets, I mentioned a simple 16-bit hash for .xls files in diary entry “16-bit Hash Collisions in .xls Spreadsheets” and a complex hash based on SHA256 for .xlsx files in diary entry “Protected OOXML Spreadsheets”.
Article Link: OOXML Spreadsheets Protected By Verifier Hashes - SANS Internet Storm Center
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