https://learn.microsoft.com/en-us/openspecs/office_file_formats/ms-offcrypto/cab78f5c-9c17-495e-bea9-032c63f02ad8?redirectedfrom=MSDN
[MS-OFFCRYPTO]: ECMA-376 Document Encryption | Microsoft Learn
ECMA-376 document encryption [ECMA-376] using standard encryption does not support CBC and does not have a provision for
document encryptionmsecmamicrosoftlearn
https://mailarchive.ietf.org/arch/msg/ietf-announce/2ymBCCxU0Eew4UihBQZ8-263eFE/
Document Action: 'TCP-ENO: Encryption Negotiation Option' to Experimental RFC...
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