Is a DEcompiled ACCDB still DEcompiled after signing?

[AHeyne]

The Microsoft Office Subject Interface Packages for Digitally Signing VBA Projects (https://www.microsoft.com/en-us/download/details.aspx?id=56617) sounded very interesting, but unfortunately it seems not to support Microsoft Access:

SUPPORTED FILE FORMATS

    MSOSIP:
        Excel: .xla, .xls, .xlt
        PowerPoint: .pot, .ppa, .pps, .ppt
        Project: .mpp, .mpt
        Publisher: .pub
        Visio: .vdw, .vdx, .vsd, .vss, .vst, .vsx, .vtx
        Word: .doc, .dot, .wiz

    MSOSIPX:
        Excel: .xlam, .xlsb, .xlsm, .xltm
        PowerPoint: .potm, .ppam, .ppsm, .pptm
        Visio: .vsdm, .vssm, .vstm
        Word: .docm, .dotm

Also in the binary "msosipx.dll" I couln't find any occurrences of the strings "accdb" or "accde" (whereas I was able to find "vsdm" or "docm").

 

[isladogs]

I hadn’t seen post #21 when I wrote this.
I have now successfully added a timestamp to a file signed with a self cert. As that is valid until 2031, I have no means of checking it remains valid after expiry.

However, as you have a valid certificate, you could easily test for yourself by downloading a trial version of 365 which will be valid for 30 days. Any files you sign will remain signed even if you cancel the 365 trial