The private key will not be in the Excel file - because it is private. You may find the public key. However, if your original purpose is signature verification then why not use the POI functions to verify it: http://poi.apache.org/encryption.html
> On 13. Sep 2018, at 05:09, 许 秋熹 <[email protected]> wrote: > > Hi.I have create an Excel file(xlsx) and use Office 2010 to create invisible > digital signature for it. > > Now I need to read the invisible digital signature info (maybe private key , > public key or expire date )from the Excel file. >
