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Questions tagged [digital-signature]

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Do audiofiles contain digital footprint which enables to trace back to the PC where the audiofile got downloaded and edited?

I'm using windows10 os on my pc. so i downloaded few audio files from a website which needs my email to login. My first question is - how to see if those audiofiles contains my email which i used to ...
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How do you know if a code signing certificate for a file is ok?

Which things should you look out for, to indicate all looks okay, when viewing a downloaded file's "Digital Signatures" tab in Windows 10? What are the signs there may be an issue with the ...
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Creating Stamps with auto-generated signature blocks in FOXIT PDF Editor

I am currently working alot with FOXIT PDF Editor to create digital stamps with signature blocks for management to sign. Currently I have to insert my own custom stamp under the comments tab and then ...
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Does GpgOL attempt to grab public keys off a default keyserver?

I currently have a customer who noticed firewall logs pointing to a URL that was never used by them before. They blocked all traffic to and from the domain of another company that was recently hit by ...
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DocuSign, User Certificates, and eIDAS

Based on my understanding in order to by eIDAS compliant, signer's digital certificate is included in the PAdES envelope. However when i sign a document with DocuSign and open it with Acrobat reader, ...
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Install drivers without a digital signature on Windows 11

I have installed a drive without a digital signature in Windows 11 using "Driver signature enforcement" mode. I can use that driver only in the driver signature enforcement mode. In the ...
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1 answer
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How can I allow another user to move files around a shared folder in OneDrive?

I have setup a Shared folder on my Onedrive account for my team to facilitate document sign off however after a member of the team signs the document they can not move the document to the next persons ...
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1 answer
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Remove trust from built app package file once added to windows trusted app

I created package of an app I developed. When running the built app it was blocked by windows. So I checked the Unblock from the properties as show in the below image. But Now I want to remove it ...
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Microsoft Word: Digital Signature in document has "recoverable signature" error

I am trying to add a digital signature to a document in Microsoft Word for Microsoft 365 MSO (Version 2110). When signing, Word says: The certificate you selected cannot be verified. Please check ...
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Verify a digital signed document by fetching public key from local CA at the time of verification

Is it possible for a user (say A) to verify a digitally signed (by user B) document without having public key of user B in local system and fetching key from the server (local CA) at the time of ...
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How to enable CA_CERTIFICATES on manjaro so that openssl works (xanmod installation error) (solved)

I'm trying to install the XanMod kernel on a Manjaro machine, but receive errors: $pamac build linux-manjaro-xanmod ... scripts/sign-file.c:25:10: fatal error: openssl/opensslv.h: No such file or ...
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gpg: skipped "12345689": Unusable secret key / how to use signing subkey for gpg?

As you see, I have a key with id 12345689, and I'm trying to sign with it in git gpg -k /home/lz/.gnupg/pubring.kbx --------------------------- pub rsa4096 2020-03-02 [C] 12345689 uid ...
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Is it bad to use a let's encrypt certificate outside its scope?

I have a let's encrypt certificate issued for my website, Since I have this certificate's private key, I could use it to sign other stuff like files, etc... (Assuming I don't leak the private key, of ...
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How do I paste the Kleopatra signature into Notepad and then email so I can send it for clearsigning by a trusted time stamp service (e.g. Stamper)?

I downloaded a zip file from Medium.com with all my articles in it and signed it using a passphrase protected keypair generated by Kleopatra of Gpg4win. When I signed the zip file called "medium-...
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How to enable GitHub clone using SSL Certificate?

I am new to GitHub. Is it possible to clone GitHub private repos using SSL certificate? Is CLI operations to GitHub & GitHub APIs can be done using SSL certificates?
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Encryption issues (emails being encrypted for sender, not receiver) in Microsoft Outlook for Microsoft 365 MSO (16.0.13628.20234) 64-bit using S/MIME

I am trying to setup email encryption functionality. I have created my own CA, 2 PFX certificates, and have signed the PFX certificates with the CA certificate. The setup on both machines seem to be ...
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1 vote
0 answers
60 views

Can I use my own driver on Windows without having to ask MS for permission while keeping Secure Boot on?

As per the subject : I want to write my own kernel mode driver I want to be able to use it with Secure Boot on I don't want to ask for permission to use it (no WHQL testing or attestation signing) ...
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2 votes
3 answers
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Why Outlook client's S/MIME settings use SHA1 as the default Hash Algorithm for digital signing a message?

can someone tell why Outlook client S/MIME settings use SHA1 as the default Hash Algorithm? Doesn't that put the certificate private key to a risk when weak algorithm is used? Or am I ...
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1 answer
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Libre Office Sign a PDF with PGP key

I'm currently facing an issue with the "Sign" feature of Libre Office. I can digital sign my ODT files without a problem. That means I can select my pgp key in the list of keys and sign the ...
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1 answer
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Verifying Veracrypt's public key

I execute the following command, as discussed in several sites: gpg --with-fingerprint VeraCrypt_PGP_public_key.asc Against current key here VeraCrypt download The output I receive is as follows: gpg:...
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1 answer
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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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  • 101
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1 answer
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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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2 votes
1 answer
8k 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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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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1 vote
0 answers
827 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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0 votes
1 answer
323 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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7 votes
1 answer
825 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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1 answer
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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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1 answer
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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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2 answers
7k 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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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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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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1 answer
121 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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2 votes
1 answer
2k 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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4 votes
2 answers
4k 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?  ...
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1 vote
2 answers
2k 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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11 votes
1 answer
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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2 answers
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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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1 vote
0 answers
1k 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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2 answers
496 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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1 vote
2 answers
252 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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3 votes
3 answers
3k 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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0 votes
1 answer
464 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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1 vote
1 answer
475 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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16 votes
2 answers
16k 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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1 vote
0 answers
5k 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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0 votes
2 answers
6k 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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0 votes
0 answers
1k 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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1 vote
0 answers
572 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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1 answer
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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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