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Microsoft Excel Security

Posted on 2004-08-19
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Last Modified: 2010-04-11
I have excel sheet , and VBA programming that have security with password Protection. The problem is it is not secure as there are software available to recover Excel and VBA password Recovery. Anybody can retrieve the password and then can change the excel/VBA to its specifications.

So what can be done so that nobody can change the excel programming even if he retrieves or he cant retrieve the file. May be password encryption will be better idea. Can anyonce help me how to do that.

Regards...

Aejaazzz
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Question by:aejaz
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Rich Rumble earned 375 total points
ID: 11860635
The strongest password in all of M$ Office's applications is the password to open... vba passwords, and passwords to modify can be removed or found instantly using Elcomsoft's recovery tools- or similar. Password to OPEN, basically should force someone to Brute-Force the document to find the pass, and if the pass is 10 or more characters long it'd take years to recover, even at the CPU speeds of today. M$ office also allows you to change the encryption algorythims from the default (RC4 for office 2000 and office XP) to stronger alog's, RC4, RSA, AES etc... no matter which you go with, you have to use a long, and as complex as you can remember, password.
http://www.securiteam.com/windowsntfocus/6K003150KG.html (just don't use "VelvetSweatShop" as your password to open, if you do, when prompted for a pass, just press enter)

Just go to Save As... then on the top right of the Save As window, go to Tools, then General Options, then Advanced, and select a different cipher, stay away from office 97 compatible, and XOR
http://www.microsoft.com/office/ork/2003/seven/ch23/SecA06.htm
http://support.microsoft.com/default.aspx?kbid=263564
There can be issues with using different types of encryption, and different versions of Office... you may not be able to decrypt a document on an Office 2000 machine, that was encrypted using a Office XP installation... make back-up's and encrypt them in a Zip file- again using long complex password- forcing the use of BF, which takes forever...
-rich
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Author Comment

by:aejaz
ID: 11867307
Thanks .... its very helpful... atleast now ppl will hav to make effort to decrypt my sheet :D
U got the points
Regards..
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