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Questions tagged [digital-signature]

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Adding Multiple Digital Signature Fields in Adobe

I have a pdf multiple people need to digitally sign. I would like to "pre add" the signature fields to the pdf so that all the signature boxes are the same size and in the right place. ...
user avatar
1 vote
2 answers
327 views

How to delete signature from a PDF

This PDF has an invalid signature, so I want to delete it. Is there some tools to do it? I use Windows/Linux system. PDF source: https://zh.z-library.se/book/3355492/93d409/classical-mechanics.html
Firestar-Reimu's user avatar
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14 views

Create view-only backup and adding digital signature

I need to create a backup of a computer running Windows 10. Said backup needs to be read-only. I believe the program EaseUs allows that. If anyone can confirm, I’d appreciate it. I am used to Linux ...
regina_fallangi's user avatar
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1 answer
51 views

Is there a certificate file containing an signature image?

Some PDF editors have this nice feature to sign your document and placing a scanned image of your signature at the same time. Is there any digital signature format out there supporting to contain an ...
Christoph Grimmer's user avatar
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ecryptfs: What would happen if we entered the wrong passphrase and continued like that? Can we prevent encryptfs from accepting a wrong passphrase?

Using ecryptfs, a fine file-system encryption mechanism on Linux. After the filesystem is setup with ecryptfs (ecryptfs is an overlay of the actual filesystem, like ext4. Files and directories name ...
Déjà vu's user avatar
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1 vote
1 answer
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Can multiple signed PDF files be merged into one?

It seems that the industry converged to the weird consensus where the digital signature of a file is stored in the file itself, on a crude imitation of paper documents. If I have a PDF document that ...
lvella's user avatar
  • 410
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0 answers
58 views

Managing signed commits as an organization

We are looking to introduce signing of commits into our company. Currently we are leaning towards using GPG kays, but we can consider SSH if what we want cannot be achieved with GPG. We are using a ...
user avatar
0 votes
1 answer
857 views

How to digital sign Excel document with a P12 file

I have a few Excel documents we need to sign at my job. Also some PDF ones. I've looked everywhere and all sites shows an "easy" answer but all lead to the same: obtain a digital id from ...
alvaroc's user avatar
  • 261
1 vote
1 answer
678 views

Error running installer in Windows 7 VM: "publisher of file [xxx] cannot be verified"

For various reasons, I need to install a third-party program on a Windows 7 VM running under Parallels Desktop 18 on a MacBook Pro running OS 12.6.1. The problem appears when I try to run the ...
danbae's user avatar
  • 123
2 votes
1 answer
2k views

Why can't I sign a friend's GPG key, even though I can sign git commits and messages just fine?

I'm trying to sign someone's GPG key, and keep getting a strange error: # for example $ gpg --sign-key [email protected] pub rsa2048/DBD2CE893E2D1C87 created: 2017-06-27 expires: never ...
c-x-berger's user avatar
6 votes
1 answer
1k views

How do I sign a file using SSH and verify it using a certificate authority?

I would like to give a selected number of developers ability to run code on a system, and verify it using OpenSSH's -Y verify feature. # Generate the certificates, and sign the dev cert with the root ...
Dvidunis's user avatar
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2 votes
1 answer
143 views

Create sample Microsoft Word document with invalid electronic signature

I'm involved in informal education of notaries public. I would like to create a sample Microsoft Word document with a valid electronic signature, made with a digital certificate. I would then like to ...
Gerard Ashton's user avatar
2 votes
0 answers
27 views

Digital Signature for project

i want to know for me to sign digitally software(i am not a developer just an investor) Do i need to use services like comodo or it can be done manually, for example i freelance soft like desktop app ...
kodomination's user avatar
1 vote
0 answers
427 views

How to resolve Signature Verification Results false positives?

I noticed that there are six DLLs in C:\Windows\System32 that sigverif.exe flags as not having been digitally signed - even though they have been. After digging into it a bit, it looks like the ...
Kyle K's user avatar
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1 answer
97 views

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 ...
Ezio's user avatar
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1 answer
974 views

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 ...
Eric's user avatar
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1 answer
109 views

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 ...
Schaja's user avatar
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1 vote
1 answer
301 views

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, ...
user1912383's user avatar
0 votes
1 answer
567 views

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 ...
Moe's user avatar
  • 1
0 votes
1 answer
34 views

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 ...
Rajendra V's user avatar
1 vote
1 answer
6k views

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 ...
jp-jee's user avatar
  • 161
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0 answers
140 views

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 ...
Patt's user avatar
  • 11
1 vote
0 answers
286 views

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 ...
jane_xxx's user avatar
4 votes
1 answer
6k views

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 ...
Rafaelo's user avatar
  • 141
0 votes
0 answers
55 views

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 ...
Alex Morales's user avatar
0 votes
0 answers
272 views

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?
rgh's user avatar
  • 1
0 votes
0 answers
1k views

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 ...
CoopDaddio's user avatar
2 votes
0 answers
94 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) ...
NovHak's user avatar
  • 141
4 votes
3 answers
3k views

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 ...
Tuuska's user avatar
  • 41
0 votes
1 answer
1k views

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 ...
White's user avatar
  • 111
0 votes
1 answer
1k views

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:...
paulj's user avatar
  • 135
0 votes
1 answer
1k 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 ...
user's user avatar
  • 101
1 vote
1 answer
2k 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)...
Tenders McChiken's user avatar
3 votes
1 answer
11k 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 ...
Albin's user avatar
  • 10.8k
0 votes
1 answer
3k 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 ...
Stephan's user avatar
1 vote
0 answers
1k 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: ...
Fateh Aslam's user avatar
0 votes
1 answer
597 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 ...
RealTimeEngineer91's user avatar
8 votes
1 answer
2k 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. – ...
marianoju's user avatar
  • 221
0 votes
1 answer
3k 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 ...
Nubcake's user avatar
  • 111
0 votes
1 answer
148 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 ...
Robert's user avatar
  • 139
0 votes
2 answers
14k 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 ...
am304's user avatar
  • 225
0 votes
0 answers
1k 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....
Onkar Narkar's user avatar
0 votes
0 answers
69 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 ...
Huud Rych's user avatar
0 votes
1 answer
165 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 ...
user1003457's user avatar
3 votes
1 answer
3k 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 ...
oshirowanen's user avatar
  • 1,740
4 votes
2 answers
9k 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?  ...
Pablo Messina's user avatar
1 vote
2 answers
4k 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 ...
Jack Martin's user avatar
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 ...
Dale's user avatar
  • 483
0 votes
2 answers
119 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 ...
Engineer999's user avatar
2 votes
0 answers
4k 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 ...
Anton.P's user avatar
  • 265

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