Invalid signature

Question

Just recently updated to Office 2010 suite on a XP system.  When I open a document in Excel 2010 with digital signatures they are invalidated.  This happens on opening the file no changes have been made to the file.  Is there a setting I'm missing.  I have word documents that are signed and they open just fine.

Answer 1

We ran into the same problem here between signing 2007 Excel docs and 2010 Excel docs.

Microsoft's 'workaround' is to disable AutoCalculation in the document. Perform a manual calculation, then sign the document. From then on the document's signatures appeared valid when opened up in other versions of Excel. This should also fix your problem with SP inconsistencies.

Answer 2

Do you get any error messages? Post the complete error message to help you better.

---

If the above was helpful please click "Vote as helpful". If it solves your problem click "Mark As Answered". Cheers !!!!!!!!!!

Answer 3

No error message.  I double click on the document to open it and when it completes opening I scroll down to the signature and they are invalid.  I have double checked the documents with Excel 2007 and the signatures are fine.  Just started when I installed 2010 on Friday Feb 4, 2011.

Answer 4

Was there a solution to this problem? I am still having this error. Thanks.

Answer 5

I encounter the same problem as well, when they're are 2 or more signatures that needs to be sign.

The signed signature has an "invalid signature" with it. the document is uploaded to a sharepoint site.

they signed it and when i open it or one of the signatories, the signed signatures have "invalid signatures" with them

It only goes away when I make the signature trustworthy to mine. but why do i have to do that???