Questions tagged [digital-signature]

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60 views

Is it possible to download electronically signed document with a signature on it?

I am sorry if this is a wrong place to ask this. If it is, redirect me to the right site. A document is electronically signed and sent me in .asice file. I managed to open the document via my ...
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21 views

Verify Windows updates on linux system

I need to manually verify Windows update files like windows10-kb....msu (and cab files) on a linux machine. The sha1 sums are integrated into the filename so creating the hash won't be difficult. But ...
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25 views

Application signature group policy

Is it possible to disable starting an application that has an invalid signature? I have three kinds of applications in Windows 10: unsigned application - allowed to start signed application - ...
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1answer
126 views

How to verify a gpg-signed file against a specific public key?

Background information: I have a directory full of files and detached .asc signatures. I also have my default keyring which includes many public keys of people (some of whom I trust and others I don't)...
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37 views

Chrome.exe - The integrity of the certificate that signed this file cannot be guaranteed

When I check the Digital Signature of Chrome.exe (and many others) there appears to be an error in the Certificate Chain but I'm not sure what is causing it. I have tried the following: sfc /scannow ...
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1answer
1k views

What does the check mark `Lock document after signing` do in Acrobat Reader?

I need to sign PDF documents with the Acrobat Reader DC (V19, Win10). What consequences does the check mark Lock document after signing specifically have? This is what I checked/got so far (partly ...
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1answer
228 views

Is my QUBES-OS master signing key right or wrong?

i just tried to verify my Qubes Master Signing Key with this description: https://www.qubes-os.org/security/verifying-signatures/#1-get-the-qubes-master-signing-key-and-verify-its-authenticity I ...
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32 views

Why does unsigned VBA code gets executed when called indirectly from signed Normal.dotm in Word?

Currently, I am observing some unexpected behavior when working with Word 2010/365 and VBA. Assume Word is set up to only allow signed VBA code. Normal.dotm is correctly signed and its VBA code gets ...
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369 views

OpenSSL Digital Signature with ES256

I am trying to reproduce a valid signature for the JSON Web Token. I make the privat key with: openssl ecparam -genkey -name prime256v1 -noout -out private.pem also convert this from Pem to P8 with: ...
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25 views

Office 365 Outlook Webmail: Is there a way to enable replying to digitally signed emails

My company uses Office 365 and when I use the Outlook desktop app on my Windows machine, everything is great. However, in Webmail I cannot reply to or forward any emails that have a digital signature. ...
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1answer
163 views

Device Driver Signing on Windows 10

I am not Windows users so I need some help with driver digital signature enforcement in windows 10 64 bits. 1) I have device driver which according Windows 10 doesn't have digital signature. When I ...
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50 views

Convert to pdf, reduce size and digitally sign svg document

Inkscape can combine text with scanned images of a signature and a blank form. This produces a letter in SVG format than can be converted in pdf and digitally signed with LibreOffice. This script in ...
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31 views

Trusted Root Certificate

I want to use an SSL certificate, or any certificate that is good, in which I can use to have better security in my emails and also for identification purposes. I have never done this and was looking ...
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1answer
212 views

How to verify an email signature from Facebook?

Facebook allows users to add OpenPGP public keys to their profile; these keys can be used to "end-to-end" encrypt notification emails sent from Facebook to your preferred email accounts. – ...
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168 views

VBA signed macro started showing “Cannot run the macro …” error after Win10 v.1903 upgrade

I had macro in this .xls file in Excel 2007 workbook. The macro was signed by my code signing certificate: I then have it set up in Excel to open only files with signed macros: This worked ...
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93 views

What happens if the certificates used to digitally sign a document expire?

We are planning to move forward with digital signature in Microsoft word instead of replying on hard copies of documents. However we are concerned with the expiration date of each certificate. ...
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42 views

signtool.exe /d “description”: how to show?

I'm trying to use the description option (/d) from Microsoft signtool.exe, to append an additional information string to the signature. Setting the description seems to be working fine, because there ...
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468 views

Secure Boot - Custom signed bootloader

Through Secure Boot on Windows 10, I am trying to make it so that only a bootloader signed with my private key can boot on a machine. This means that even if someone else comes along with a Microsoft ...
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1answer
66 views

Word Signature Line: not all certificates from certmgr.msc/Personal/Certificates selectable?

In Microsoft Word you can add a signature line to a document. It is an item inside the document that initially looks like this: Once you've added that signature line to the document you can double ...
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2answers
2k views

How to add multiple digital signatures to an Excel spreadsheet?

I have an Excel spreadsheet that lives on a shared folder, that everybody can access. On that spreadsheet, I have a worksheet with a list of tasks that have to be completed, but not necessarily by the ...
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35 views

Why is Microsoft Word displaying hidden text once i signed a document?

I am currently using hidden texts in my word documents to add notes or things useful for me only. I can easily access these hidden texts by displaying the formatting characters while other readers ...
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165 views

unknown tag 26 encountered bouncy castle exception

unknown tag 26 encountered at org.bouncycastle.asn1.ASN1InputStream.buildObject(Unknown Source) at org.bouncycastle.asn1.ASN1InputStream.readObject(Unknown Source) at org.bouncycastle.asn1....
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36 views

Understanding an email with no SPF, DKIM, or DMARC but is has a valid digital signature

Can someone explain in simple terms what does it mean, that an email has no SPF, DKIM, or DMARC (from what I read and understood is that this email is likely to end up as as spam or rejected by the ...
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1answer
53 views

Combine excel and keep signature line

I'm doing an excel and SharePoint project where I provide user with an excel file with a Microsoft signature line that user review and sign. These are separate files for each user and the files are ...
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1answer
693 views

Sign only using GpgOL in Outlook

I currently have the Outlook plugging GpgOL which lets me encrypt/sign emails using an OpenPGP encryption key. Is it possible to somehow remove the encryption option or somehow hide the encryption ...
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1answer
428 views

How to fake handwriting on pdf without printer and scanner?

Bureaucracy sometimes requires us to print a document, fill in blank fields, sign it, scan it and send it back. Is there an easy way to fool the bureaucrats when no printer or scanner are available? I ...
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82 views

Forensics on a single CD-Rom Disc

Is there a way to find out information as to what device created the data on a CD-Rom in addition to when the disk was formatted and burned? I have a friend facing criminal charges based solely on a ...
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1answer
440 views

Windows 10 Driver(without hardware device) with Error 39, 0xc0000603, Certificate Revoked

Well, the driver was signed by EV Signing Certificate and Microsoft Windows Hardware Compatibility Publisher(WHLK\WHQL) With Secure Boot on Win 10 machine, I got the error code 39(Windows cannot ...
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1answer
2k views

How can I verify that a Windows XP POS operating system executable is authentic?

I have a 3rd party firewall that alerted me that msiexec.exe was replaced by another version. The timing didn't correspond to an OS update, so I was worried a bad actor replaced the exe. How can I ...
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100 views

Outlook 2016 Pro Plus Digital Signature issue

in my organization there are 50 clients, circa (Windows 10). On 8-10 of these, there's a single mail account configured with IMAP in Outlook 2016. From 15/10/2018 some emails from inbox automatically ...
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2answers
40 views

Issues understanding CA certificates

I have misconceptions regarding CA (Certificate Authority) certificates. No matter how many things I read, it is still not fully clear. Let's take an example, Bob accesses a website. In order for ...
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0answers
292 views

Windows 10 - Different methods to disable driver signature check and their realations

For Windows 10 I am examining different methods to monitor the disabling of "driver signature check". From a search online I found 3 main method: from administrator cmd run: bcdedit.exe -set ...
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2answers
290 views

gpg-zip using secret key sign a zip

I have the following problem. I created a Key-Pair with Thunderbird (Engimail), then I exported the asc file, and importet it in the git bash to gpg. Now I need to sign a zip. Using the command: ...
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2answers
188 views

How to create GlobalSign Timestamp Digest?

I am attempting to use the Global Sign Digital Signing Service API to sign a PDF document. I have received some of their documentation. But I am unable to understand their request to provide a "digest"...
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3answers
1k views

Digitally signed driver not verified by Windows (Code 52)

I am installing the I2CTools USB-to-I2C Elite driver for Win 10 x64, but I got a dialog saying ”Jungo Connectivity: a digitally signed driver is required.” In device manager the two drivers ...
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1answer
306 views

Signing a message with a SmartCard / Yubikey

So I've gone through a pretty bog-standard GPG-key-setup process, and then used addtokey to move said keys onto a Yubikey 4. Now, on a fresh setup, I want to try and use those keys, to sign something....
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1answer
301 views

How to use PIV smartcards (YubiKey 4) to sign application binaries?

I am about to start using my YubiKey 4 (RSA 2048 bit key) for signing application binaries. There a quite a few tutorials about how to setup this. It seems that most tutorials based on the original ...
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2answers
8k views

How to verify a digital signature on a PDF on Linux?

I am a Linux desktop user. Someone sends me a PDF file which is digitally signed. It is supposed to be signed using some kind of government / regulated body / official institution issued certificate. ...
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0answers
2k views

Prevent losing a digital Signature when a document is saved?

The question What is an effective work-around to prevent a Digital Signature dropping from a file when it's saved? Or, What would be an efficient way to replicate saving data to a Macro Enabled MS ...
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2answers
5k views

S/MIME signed email loses attachment

We have a small number of users who digitally sign (but don't encrypt) their email. When they send attachments, it usually works fine. However, when the recipient is using Outlook Mobile, all ...
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0answers
659 views

This digital signature is invalid and cannot be trusted. The macros will be disabled

I am using MS Excel containing macro at customer place for some automation in excel. When the customer opens excel containing macro with the valid EV digital signature (Also tried with previously ...
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0answers
408 views

How to sign with a specific subkey using GnuPG?

Say I have two subkeys like below. /c/Users/user/.gnupg/secring.gpg --------------------------------- sec 2048R/DC****** 2017-05-25 uid J D <J.D@gmail.com> ssb 2048R/...
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1answer
518 views

Verifying/decrypt email using PGP signature/public key

UPDATED QUESTION: Using Outlook 2013 64bit on Windows 7 64bit, I have setup GnuPG which allows me to send encrypted emails. To do that, I asked someone for their public key. I sent them an email ...
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1answer
335 views

How to do RPM package signature verification in Windows?

I’m trying to do GPG signature validation to Centos 7 RPM files that I have downloaded. They are validated during the first download, but I am trying to another validation after they have been ...
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0answers
141 views

Permanent accept of java certificate is not woring on windows 10

Usually when starting a signed Java Application - no matter if starting inside a browser as applet or via JNLP/JavaWebStart – there is a warning prompt notifying if to run the application. On ...
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1answer
2k views

Programmatically getting an executable's Certificate Details

It is possible to somehow programmatically export a file's digital certificate's subject if the certificate itself is not installed on the workstation but is only used to sign that specific file? I ...
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1answer
1k views

minispy - Windows cannot verify the digital signature for this file

I have built the Microsoft sample minispy minifilter with no issue. I made sure that since I am using 64-bit, I have also compiled in x64 on my Visual Studio. Tried both Debug and Release. Hence in ...
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2answers
4k views

How do I check gpg signature given only the fingerprint and key ID?

I am trying to check the integrity of my gmp-6.1.2.tar.lz download (see here). I am on CentOS 6.6 using gpg (GnuPG) 2.0.14. The GMP website only lists Key ID: 0x28C67298 Key type: 2560 bit RSA ...
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1answer
229 views

How to modify a resource in exporer.exe

I've created a notification icon that's much more visible than the existing black and white one. This icon has exactly the same size in bytes as the existing one, so I was hoping I could replace it ...
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0answers
119 views

Windows 10: will drivers installed using testmode still work then testmode is disabled?

I have a general understanding problem with Windows Testmode and how to install unsigned drivers: I understand that if I have drivers (in my case for an USB to RS232 serial adapter) that are not ...