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A comment on Excel VBA Password Protection is useless. Parent comment

Re:Excel VBA Password Protection is useless by nonchalance on Tuesday October 08, 2013 @12:57AM (#6513134)
Excel does implement some 40-bit RC4 encryption method for workbooks that require a password to read (which you can brute force within a day), but the password to modify is trivial to remove.
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Re:Excel VBA Password Protection is useless by yuhong on Tuesday October 08, 2013 @03:03AM (#6513434)
By default in the old XLS file formats. Office XP introduced CryptoAPI RC4 encryption to improve security, unfortunately the UI for it was removed in Office 2007 and you will have to use the DefaultEncryption registry key to enable it now.
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