Questions tagged [signature]

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Verify exe file signature

I want to verify whether windows exe file has a valid signature. Also I'd like to extract some additional fields (Issued by and Signing time). How can I do that? Preferably from command line. For ...
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Unable to download SHA256SUM and other Keys? [duplicate]

Hi Ubuntians, I have tried to download gpg and sha256sum keys from http://releases.ubuntu.com/18.04.3/. But, can't do it. It opens new tab and shows keys. It is difficult to verify the ISO....
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1answer
25 views

How to sign snaps without pushing or pushing it to snap store?

I am creating a snap for my software but until now I've been using --devmode or --dangerous flag to snap install. Now, I would like to sign it, but I can't find something like step-by-step or tutorial ...
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29 views

sbsign: sign a non EFI kernel

The following link explains how to sign a kernel module: https://ubuntu.com/blog/how-to-sign-things-for-secure-boot sbsign --key MOK.priv --cert MOK.pem my_binary.efi --output my_binary.efi.signed ...
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570 views

What exactly is an ext4 signature and why am I removing it?

I was following the steps from an Ask Ubuntu answer (Increase partition size on which Ubuntu is installed?) to enlarge an Ubuntu VM I have and I'm wondering what is actually being removed here: ...
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107 views

How to digitally sign documents in OpenOffice under Ubuntu?

On Ubuntu 19.04, Libreoffice seems to be there, but when I clicked, all the apps seem to be missing (like the word processor and the spreadsheet). So I first installed OpenOffice. Then I figured out ...
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42 views

Unable to mount External HDD missing NTFS and UUID

I need some help! The facts: I was trying to mount a microSD card while my external HDD (Samsung M3 Portable) was plugged and sth went wrong after these mistakes at command line: sudo wipefs --all -...
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34 views

How to specify which public key file to use with a repository?

I am trying to set up a repo on local file system on ubuntu. I will use that repo only during the installation of my product & then remove the repo. Now I want to have my deb packages signed &...
3
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1answer
469 views

Dell Canonical repository is not signed (GPG error)

With the update to 19.04 my dell repository is not working as it is marked as not signed. This is the error I get: Ign:11 http://dell.archive.canonical.com/updates xenial-dell Release.gpg W: GPG ...
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275 views

How can I use Watchdata Proxkey Digital Signature Token in Ubuntu

I have watchdata proxkey digital signature token from pagaria. I have installed it in ubuntu. But I do not find any way to use the token in ubuntu. Any ideas.
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39 views

How to enlist all invalid signatures?

My machine keeps prompting of "Invalid Signatures Found" at every single boot. I knew of two kernel modules that had invalid signatures, the NVIDIA display driver module and the vboxdrv module, and I ...
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1k views

PKCS#7 signature not signed with a trusted key

Hi i just installed ubuntu 18.10 first boot worked fine but after I reboot black screen with this message keep comming up PKCS#7 signature not signed with a trusted key I have no idea what this ...
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195 views

PGP signature isn't selected when trying to sign during export of PDF-file in LibreOffice Writer

I have asked the following question on https://ask.libreoffice.org/en/question/183723/signature-isnt-selected-when-trying-to-sign-during-export-of-pdf-file-in-writer/ but nobody answered: I have an ...
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2answers
6k views

Boot Message: pkcs #7 signature not signed with a trusted key

It seems that this bug is an old one, and a really persistent one, as has been reported by several users. It was also reported that the bug has been resolved in patch updates, but, somehow, I am still ...
2
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1answer
206 views

LibreOffice fails to access my personal certificate

Recently, I updated my personal certificate. Then I wanted to sign a libreoffice document. I followed the instructions from Part 1 to Part 4. Both Thunderbird and Firefox are displaying the correct, ...
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1answer
566 views

Does DPKG support for verifying GPG signature for Debian package files?

I am trying to enable the GPG verification in /etc/dpkg/dpkg.cfg by remove no-debsig in this configuration file: .# Do not enable debsig-verify by default; since the distribution is not using ...
4
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1answer
232 views

openprinting key for ubuntu 18

I'm trying to add openprinting repo (http://www.openprinting.org/download/printdriver/debian lsb3.2) to my computer for some reason the key I downloaded (Release.gpg) is not working. I keep getting ...
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1answer
998 views

How to get pgp's scdaemon on ubuntu 18.04?

How to get pgp's scdaemon on ubuntu 18.04? It seems that for older versions it is present, but how should I install for newer ones? PS: I'm trying to use gpg --edit-card
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109 views

Does Ubuntu Secure Boot make Intel TXT unnecessary?

Ubuntu supports Secure Boot, an UEFI feature. On Windows, Trusted Boot takes over where Secure Boot leaves off: the bootloader verifies the digital signature of the Windows kernel before loading it. ...
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1answer
2k views

Ubutnu 18.04 - after upgrade - Display/PKCS#7 signature error

After upgrading from 17.10 to 18.04, anytime I try and open ubuntu I am getting the following errors (which are found in my kern.log as well) Sep 28 15:06:12 aram-UX330UAK kernel: [ 15.056052] PKCS#...
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1answer
281 views

Unsigned repositories after running apt-get update (16.04)

Running apt-get update today refuses to update repositories as it doesn't think they are signed. At first it just gave the At least one invalid signature was encountered error for all repositories, ...
2
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1answer
67 views

When I verify a signed document with gpg, how does it know what public key to use?

When I sign a document, I can select the secret key to use e.g. like this: gpg --default-key=BF8C1203 --clearsign message.txt When I verify a document, I do not see this option, I can just do: gpg -...
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0answers
57 views

Digital signature and verification when the keys are in text files

I generated a key-pair using ssh-keygen. They are in two text files, say "abc.txt" and "abc.txt.pub". Now, I want to use the private key to sign a document. I did not find a way to do it with ssh, ...
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245 views

snort threshold.conf

I have suppressed a certain signature in etc/snort/threshold.conf, but after I saved and came out from threshold.conf file, I am still seeing those alerts in log file, here my question is do I need to ...
0
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1answer
1k views

Geary signature image

I found the signature option for Geary and I tried making a signature with an image. Referring to a file on my pc doens't work. When i paste the data-url from the image in the src box, it shows the ...
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0answers
28 views

failed to verify iso image: gpg can't check signature [duplicate]

I was trying to verify the iso image after dowloading the Discreete Linux. I carefully followed the instructions from Discreete website: https://www.discreete-linux.org/howto.html#use_pre That means ...
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2answers
3k views

Tor Browser Launcher does not download Tor Browser

I have installed Tor Browser Launcher: sudo apt-get install torbrowser-launcher but when I try to run Tor Browser the download always fail: Note: other downloads finish properly and I can correctly ...
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0answers
773 views

Why do I receive 'file open error' message?

I am trying to download swift 3.1.1 using ubuntu16.04 using the tutorial found at this link: https://swift.org/download/#using-downloads However, when I try to verify the signature file (step 4), I ...
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0answers
106 views

Tor Browser installation failed [duplicate]

I just downloaded tor browser; distro version - Ubuntu 16.04LTS. After installing tor I get: SIGNATURE VERIFICATION FAILED (RETRY failed). Is there a way to install it?
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1answer
1k views

How does Secure Boot actually work?

I'm playing with GRUB2, SecureBoot and Kernel Signing and I think I found a possible bug in my Secure Boot, but I want to check my understanding of these processes first. I know that when Secure Boot ...
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0answers
53 views

How to stay safe when adding new apt keys? [closed]

I'm a new user to Linux. I want to know how to stay safe when adding and installing new software by adding apt keys to repository then running sudo apt-get update, sudo apt-get install name. On ...
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2answers
1k views

Signing Module on Non-UEFI Boards

I am on Ubuntu 16.04 with the 4.4.0-57 kernel and I want to install a self-made module. The BIOS is a non UEFI BIOS (Kontron 986LCD-M/mITX). I tried to sign the module by following this procedure ...
2
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1answer
769 views

Signing problem with own apt repository

I want to create an own repository for our application. I created a master key with signing subkey with pgp before and I sign the deb package with: dpkg-sig --sign builder sample.deb Then I create ...
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1answer
4k views

Generating, Signing and Verifying Digital Certificates

So here's a question from my project. In this task, we will use OpenSSL to generate digital signatures. Please prepare a file (example.txt) of any size. Also prepare an RSA public/private key pair. ...
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1answer
162 views

Why are there no gpg signed hashes for the mini.iso

None of the gpg-signed files I've found containing hashes for various ubuntu iso files contain a hash for the mini.iso files. The only hashes for the mini.iso files I've found are plain md5sums on the ...
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2answers
904 views

Signature-based rootkit scanner?

Currently the only rootkit scanners I know of have to be installed on the machine before the rootkit so that they can compare file changes etc (e.g.: chkrootkit and rkhunter), but what I really need ...
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0answers
69 views

Java Applet on Ubuntu Web Server

I have an java applet to sign documents digitally: http://www.pki.sanluis.gov.ar/PkiAsp/Paginas/Pagina.asp?PaginaId=54 I have a middleware to do this from a smart card. I can't export the private key ...
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1answer
299 views

Select PGP signature key in KMail

I have just generated a new PGP key pair with KGpg. I want to use the key for signing and encrypting mails. I have done that before without problems ... now it no longer works. Either I have made a ...
0
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1answer
625 views

Invalid Boot Signature after upgrade to 16.04 (dual boot windows 10) [duplicate]

I'm lost not sure what to do here.... I don't know how to configure my secure booting options. I don't which setting to change?
2
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1answer
106 views

What keys is GnuPG using for signature verification?

Let assume that I have a list of three key pair on my bash screen when I run the following commands: gpg2 --list-keys and gpg2 --list-secret-keys My question is, when I run the following command ...
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0answers
848 views

How to insert digital signature in LibreOffice documents [duplicate]

I was trying to insert digital signature in LibreOffice writer documents. I went to file section then to digital signature. After that, I couldn't insert my sign because the option was blank. How to ...
1
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2answers
3k views

bypass the yes prompt in apt-get install, but only authorized packages

How do I call apt-get install -y --force-yes if I want to install the package no matter what, except unauthorized packages. So I want apt-get to work in non interactive mode and only with signed ...
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2answers
4k views

How to sign files with Ubuntu command-line tools and my own keys?

I want to sign some Python code files I wrote, because they are plug-in modules for one of my projects. For distributing it, I want that the user can be sure a plug-in is verified and safe (because ...
10
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2answers
7k views

how do you create a “signed” deb package

I want to create a number of deb packages, but I don't know how "signing" packages works. So I was wondering how to create a signed deb package.
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0answers
470 views

How do I sign my own kernel modules to avoid tainting the kernel?

I've made a kernel module, using this tutorial as an example. It works, but on loading I get a warning in kernel log: gdt_get: module verification failed: signature and/or required key missing - ...
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4answers
36k views

Google Chrome PPA upgrade invalid signature

When running: sudo apt-get update && sudo apt-get dist-upgrade I got this output: Ign http://security.ubuntu.com utopic-security InRelease Ign http://gb.archive.ubuntu.com utopic InRelease ...
7
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2answers
13k views

GPG says that it needs a passphrase but it actually doesn't

I try to use GPG to sign files but something confuses me: If I enter in the terminal (the file I want to sign is called "checksums") it says: $ gpg -s checksums You need a passphrase to unlock ...
3
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0answers
585 views

Include signature for new messages only. Evolution mail client

Previously I found on Thunderbird, there's a option called checkbox: Include signature for replies. If I un-select this box, Thunderbird adding signature only for the new messages. Not for replies. ...
2
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1answer
1k views

CAC Card Digital signatures in LibreOffice

All, I've been wondering if there is an approveit equivalent for Libre Office that supports the applying of digital certificate signatures from my CAC card to say, writer or impress, or calc the way ...
6
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2answers
26k views

Signatures not verified [duplicate]

These are the signature errors that persist after I tried several fixes mentioned on the Internet W: GPG error: http://deb.opera.com stable InRelease: The following signatures couldn't be verified ...