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Luis DiazFlag for Colombia

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Best way to encrypt a xls file

Hello experts,

I have a xls file which have confidential data and I would like just to share with a specific person. What is the simplest, best and secure way to encrypt the file without installing software: zip file with encryption, excel encryption or another method?

Thank you very much for your help.
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Thank you. The problem with excel encryption is that can be broken through VBA or another method isn't?
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if encryption in excel is ok and cannot be broken I would take it. The complexity of the password can influence on the security process. If I put a long password with special characters is better or it doesn't matter?
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Ok, I think the best is to encrypt directly xls file.

Thank you again for your help.