encrypte excel file

Question

HI, Expert,

Could you give help how to encrypte the file to prevent change on worksheet?

version Office 365

1. try setup password protect sheet .
2. setup password on VB command button. to prevent change on worksheet.

password up to 30 length with Letters, Mixed case, Punctuation,Numbers. ==== very strong.

I test decrypte the file by free tool. It will decrypte in one minute.

Tks n brgds
Liu Wei

Answer 1

That tells you it did not use Brute Force approach to decrypt.

If you want NSA-level security, Excel is not your tool.
If you want to keep honest people honest, the Sheet Protection feature is just fine.