EFS encription in excel file

I am using XP sp3
I have an excel  spreadsheet and believe that I can protect it with encryption "EFS"

How can I check I have EFS installed and how can I use this on a .xls spreadsheet?

I found in the spreadsheet Tools/Protection/ProtectSheet but am not sure is this is encrytion or a password.
I understand encryption is much stronger.

Many thanks
John
johnhardyAsked:
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TommySzalapskiCommented:
ProtectSheet is just a password and does not use encryption. You can add encryption though by clicking the 'Advanced' button on the protect tab. Detailed instructions here:
http://www.oraxcel.com/projects/encoffice/help/protect_excel.html
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Russell_VenableCommented:
EFS stands for Encryption File Service. EFS primary purpose is to make your files unreadable if they are viewed by a different user on a different computer or windows profile. If you leave your computer unattended, someone can just open your file from your profile and do as they like.

It's not a very good encryption system to use. Plus if your account gets deleted so does the certificates and keys that allow to read them on your profile making it near impossible to unencrypted your files again.

You can use the method above to encrypt your excel sheet or you can use something like PGP(Pretty Good Protection) which uses a passphrase and not a password to authenticate. They also use 1026 bit encryption. All depends on how strong you want it to be encrypted.
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johnhardyAuthor Commented:
Thanks for both answers.
Plus if your account gets deleted so does the certificates and keys that allow to read them on your profile making it near impossible to unencrypted your files again
Re the account mentioned I am not clear where this account is held. Can you please say further?
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Russell_VenableCommented:
To clarify for you. It would be the account you login to windows with encrypt the files using EFS on your same profile and move the files to lets say a USB stick and your computer takes a nose dive, you won't have access to those files anymore.
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johnhardyAuthor Commented:
Many thanks for the excellent help
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Russell_VenableCommented:
Np.
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