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360 games PC games https://support.microsoft.com/en-us/kb/2756166 Windows games Windows phone games Entertainment All Entertainment https://support.office.com/en-us/article/How-to-tell-if-a-digital-signature-is-trustworthy-61a46050-9a9f-40ab-a894-3ccd60c44415 Movies & TV Music Business & Education Business Students & educators Developers Sale Sale Find a store Gift cards Products Software & services Windows Office Free downloads & security Internet event log Explorer Microsoft Edge Skype OneNote OneDrive Microsoft Health MSN Bing Microsoft Groove Microsoft Movies & TV Devices & Xbox All Microsoft devices Microsoft Surface All Windows PCs & tablets PC accessories Xbox & games Microsoft Lumia All microsoft word log Windows phones Microsoft HoloLens For business Cloud Platform Microsoft Azure Microsoft Dynamics Windows for business Office for business Skype for business Surface for business Enterprise solutions Small business solutions Find a solutions provider Volume Licensing For developers & IT pros Develop Windows apps Microsoft Azure MSDN TechNet Visual Studio For students & educators Office for students OneNote in classroom Shop PCs & tablets perfect for students Microsoft in Education Support Sign in Cart Cart Javascript is disabled Please enable javascript and refresh the page Cookies are disabled Please enable cookies and refresh the page CV: {{ getCv() }} English (United States) Terms of use Privacy & cookies Trademarks © 2016 Microsoft
a digital signature is trustworthy Applies To: Excel 2010, Word 2010, PowerPoint 2010, Access 2010, Visio 2010, Office 2010, Visio Standard 2010, Less Applies To: Excel 2010 , Word 2010 , PowerPoint 2010 , Access 2010 , Visio 2010 , Office 2010 , Visio Standard 2010 , More... Which version do I have? More... Digital signatures and certificates play a central role in software security. This article describes how to view the information that indicates when digital signatures and associated certificates are invalid. To learn about digital signatures, see Digital signatures and certificates In this article Digital-signature and certificate trustworthiness in Word, Excel, or PowerPoint How to tell if a digital signature is trustworthy Invalid digital signatures Recoverable-error digital signatures Partial digital signatures Digital-signature and certificate trustworthiness in Word, Excel, or PowerPoint Use the following instructions to view certificate data associated with a digital signature to verify trustworthiness. Open the Word document, Excel spreadsheet, or PowerPoint presentation that has a digital signature. Double click the signature line. Note: If the signature line is not available, click the red Signatures button. The Signatures pane appears. On the signature name, click the down-arrow. Select Signature Details. The following image is an example of the Signatures button. The Signature Details dialog appears. For more certificate information, click View. The Certificate dialog appears. On the General tab, you can identify certificate information: Issued to To whom this certificate was issued Issued by What organization issued the certificate Valid from / to Duration of certificate validity On the Details tab, you can see details such as: Version Serial number Issuer Subject Public key On the Certification Path tab, you can identify the certificate root and certificate status. The following image is an example of the Certificate dialog. Top of Page How to tell if a digital signature is trustworthy A trustworthy signature is valid, on the user account, on the computer that states it as valid. If the signature were opened on another computer, or another account, the signature may appear as invalid because that account may not trust the certificate issuer. Also, for a signature to be valid, the cryptographic integrity of the signature must be intact. This means that the signed