How to encrypt excel in xls format?

zurmokeeper 0

How to encrypt excel in xls format? This document below only talks about some algorithms and processes for decryption, it doesn't explain how to encrypt?

link

KristianSmith-MSFT 121 Reputation points Microsoft Employee

2024-07-26T22:21:44.7733333+00:00

Hi zurmokeeper,

Thank you for your request. One of our team members will review this and follow up with you soon.

Regards,
Kristian Smith
Support Escalation Engineer
Microsoft Open Specs
Mike Bowen 1,791 Reputation points Microsoft Employee

2024-07-26T23:08:30.91+00:00

Hi zurmokeeper,

Thanks for your question about [MS-OFFCRYPTO]. Could you please provide more details about what you think is missing? E.g. is information missing in a section or explanations incomplete. And where in the document do you think it should go.

Best regards,

Michael Bowen

Microsoft Open Specifications
zurmokeeper 0 Reputation points

2024-07-27T03:09:23.64+00:00

Thanks,
link
For example, the link above this 2.3 Encryption chapter, just talk about the encryption and decryption algorithms is what, but on the content of the xls specific bytes to deal with how it does not explain, decryption is okay the community has a lot of implementation, but on the xls encryption is really too vague.

1 answer

Mike Bowen 1,791 Reputation points Microsoft Employee

2024-07-29T18:25:26.4133333+00:00
Hi zurmokeeper,

MS-OFFCRYPTO specifies the Office Document Cryptography Structure but does not describe the implementation details. You can find information about implementation in the Web App Devlopment section of zcusa.951200.xyz. Some good places to start are

Microsoft Enhanced Cryptographic Provider

Cryptography, CryptoAPI, and CAPICOM

Encrypting Data

Best regards,Michael Bowen

Microsoft Open Specifications
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