Questions tagged [code-signing]
Code Signing is the process of putting a signature on executables and patches to prove it is genuine, and to prevent attackers from injecting malicious code into end-user's systems.
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Is SecureBoot of any use if I keep my private key in a root accessible file?
According to the Debian wiki on SecureBoot,
This removes the risk of userland malware potentially enrolling new keys and therefore bypassing the entire point of SB.
So SecureBoot stops users from ...
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1answer
107 views
gpg key size of 4096 and “the future is ECC”
My boss wants to sign our binary. I need to tell him how he can create the signing key.
Most if not all sites I have seen about signing binaries say "use gpg".
OK, so gpg per default has 2048. Their ...
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48 views
How to verify a GPG file signature on Linux and Windows without connecting to the Internet?
Can you please hint me to the steps I need to verify a file's signature (without connecting to the Internet) on command line using GnuPG, when I have the required files ready:
-installation file (eg ...
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46 views
File authentifications via PGP versus via unique file hashes
Many files that are available for download (eg in github) come along with "asc" signature files attached, or with a sha256 file hash. Can someone please explain difference of PGP signatures vs file ...
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Create signed release binaries and distribute with custom repository (debian)
I have been tasked to create a custom repository with signed binaries for download. Our CEO explicitly mentioned that he wants the binary signed by himself and his business parther.
I set up a ...
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1answer
78 views
Why does Windows consider a certificate valid even after its expiration time?
I downloaded Google's Cloud SDK installer today, and upon checking the certificate to validate it, I noticed something strange: the expiration date of the certificate appears to be December 22nd 2019 -...
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1answer
125 views
Why does productsign use SHA1 instead of SHA256 to sign the pkg?
I have an application which is packed into a pkg file using productbuild and then is signed using productsign. However when I run pkgutil --check-signature only the SHA1 signature is shown. I also ...
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126 views
Can I use Let's Encrypt to verify my signing key?
I've made a signing key with GPG and I would like to have it verified since GPG displays a warning whenever a file signed with my key is verified. I've heard of Let's Encrypt but it only talks about ...
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Confirming the validity/ownership of a Android Signing Certificate
I have a certificate that says the application was signed by Google, but on multiple searches I have reason to believe that it's not actually a google signing certificate.
Is there a way to query ...
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Can an EXE code signing renew even though it's expired?
I've just downloaded composer from getcomposer.org, but a strange thing had happened.
When I clicked "install for all users" button, the UCA says "Unknown publisher", but when I was checking its ...
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1answer
57 views
Cryptographically signing content / download
Let's say that I have an executable running on a client machine, and, it requires to download some updates on a regular basis. The solution uses TLS to communicate with the download server.
I would ...
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1answer
68 views
How to ensure authenticity and integrity of a directory
I want to do something similar to Ubuntu's signed checksums in distribution and I'm currently stuck on the integrity part. The tutorial here covers most of what I'd like the process to look like (I've ...
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Check CRLs of signed JARs
I have a signed JAR. How could I check if the corresponding code-signing certificate was revoked? Technically there seem to be the following options:
The Java TrustStore holds CRLs/revoked ...
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Transferring Microsoft SmartScreen reputation to renewed certificate
I know that even a software signed with a new code signing certificate triggers Microsoft Defender SmartScreen warning:
Windows Defender SmartScreen prevented an unrecognized app from starting
The ...
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How attackers bypass windows smart screen [closed]
I'm curious to how attackers gain access to valid EV certificates that bypass windows smart screen (for malware delivery/execution) or how they sign these malicious software(s) without access to EV ...
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1answer
87 views
How reliable is Virustotal's file signature check?
I downloaded a setup.msi file from an untrusted website. Virustotal says it's a signed file and valid signature, by the developer company and "GlobalSign Extended Validation CodeSigning CA" 3 times ...
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43 views
What does jarsigner verify in the first place (integrity or authenticity)?
I was reading sth about android code signing and have run into this statement:
The second jarsigner command at v in Listing 3-7 first verifies the
signature block and signing certificate, ...
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24 views
High Availability Boot processes and only using code-signing certificates
High Availability Boot (HAB) is a technique described here in an NxP application note. This is best summarised as:
"HAB authentication is based on public key cryptography using the RSA algorithm in ...
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1answer
83 views
Cross-signing certificates for Windows Driver Signing
For testing purposes I want to test cross-signing certificates for Windows driver signing. I understand the general concept: Two root CAs, one root CA cross-signs the other root CA's public key.
...
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1answer
140 views
Having a code-signed binary, how can I tell if it's signed with an Extended Validation (EV) certificate?
I can't seem to find an answer to this seemingly simple question. Say, on Windows, if I have a binary file:
How can I tell if it was signed with an extended validation (EV) code-signing certificate?
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69 views
Certificate pinning for device firmware signing
What are common mechanisms to ensure that a device firmware is not only properly signed, but actually signed by the correct device manufacturer? In TLS communications, certificate pinning or public ...
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2k views
Why are non-collision-resistant hash functions considered insecure for signing self-generated information
Let we have a hash function that is second preimage resistant but not collision-resistant.
Then an adversary can create a pair of different messages M and M', M is benign and M' is malicious, for ...
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Why would one choose to use Cryptography API: Next Generation(CNG) over Signtool.exe or vice versa?
It seems like both Cryptography API: Next Generation(CNG) and Signtool.exe can be used for the purpose of code signing.
CNG provides functions to perform operations such as Hashing and Signing. But ...
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2answers
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Signing the same solution (list of files) by multiple CA
We (platform owner) have a requirement to sign a 3rd party (partner) software solution which will be hosted on our platform. The 3rd party solution is signed by the partner with some well known CA. ...
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Will my Windows driver stop being reported as malware if signed? [duplicate]
I have developed an IRP hooking based driver for one of my clients. Avast oes not complain about it but his AV suite reports it as malware. The lient will eventually sign this driver, but will it ...
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271 views
Can I sign with two Code Signing certs to build reputation on the newer one?
I recently acquired a Microsoft Authenticode Code-signing certificate as a new certificate using an identical name to another one which will expire soon.
Obviously, the new certificate has no ...
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Windows Smart Screen pops up after EV Code Signing
I am code signing my application's installer using an EV Code Signing that we have bought recently at work. The code signing is performed when the installer is created using Inno Setup (version 5.6.1)....
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2answers
366 views
How to verify a private key has not been compromised?
I have a machine with a process that signs code for users running 24/7 (encrypting the key is not possible), which will be protected as well as possible. Is there a way to set things up such that I ...
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109 views
Secure way to sign virtualbox module for secure boot
I'm not sure if the Virtualbox version from the repository of my Linux distribution is already signed and works right away, but since it's not up-to-date I'm installing Virtualbox from the official ...
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1answer
153 views
How do I verify that my TurboTax software is legitimate
I bought TurboTax software from Amazon (downloaded Mac version). Therefore, I know it is safe to use. However, if one wants to verify the software has not been tampered with, how do we do that? Mac ...
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1answer
56 views
Code-Signing: Why is the CA process different from web site certificates?
I recently went to renew a code signing certificate. In preparation I went through our usual process (as for web server certificates) of creating a key pair and a CSR with OpenSSL. When I then went ...
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1answer
89 views
Software Signing Standards
Is there a software signing certificates standard, officially or by popularity?
As I understand the SSL/TLS/https certificates rules are specified by the RFCs. Mixed use of servers and clients from ...
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2answers
546 views
Are all fields of the PE certificate directory hashed during authenticode signing?
In a Windows portable executable (PE) file the certificate directory points to an offset to a WIN_CERTIFICATE structure. My understanding is that while the field is named bCertificate, it actually ...
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143 views
Deploy verifiable webapp source code
Recently there have been quite some discussions about the security approach of ProtonMail. Since it do crypto stuff at client-side, loading the javascript code in the user's browser, as far as i know, ...
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154 views
Working with Security Metadata in APK file
According to this Blog post, Google has added a Security Metadata on top of an APK to verify that it was originally distributed by Google Play. More specifically it adds APK Signing Block to the APK ...
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269 views
What happens when the timestamper's certificate expires?
What happens when the timestampers certificate expires?
If the code is now untrusted, can it be re-stamped without re-signing?
If not, what good does this timestamp do me if my cert is valid until the ...
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2answers
725 views
How can I verify signed commits made by other people?
As identified in this related question, github signs commits made from their application with their GPG key 4AEE18F83AFDEB23. Online, I can see commits tagged as 'verified'. But when I attempt to ...
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1answer
158 views
Alert when unsigned code is run?
I know Windows 10 has a lockdown option, to forbid running unsigned code. But in my organization, I'd get shot if I tried to do that. So I'd like the next best thing: a remote alert whenever unsigned ...
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1answer
304 views
why is it necessary to have both code signing and time stamping certificates?
I have read about the option to create certificates for signing codes and time stamping. why do we need both of them?
I understand that it helps me when I need to increase the validity of my code, ...
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757 views
Where to put a code signing server with EV code signing certificate and plugged-in HSM
Microsoft recently started enforcing apps to be signed by EV code-signing certificates instead of just regular certificates. These usually come on an external device such as USB smart card or a HSM, ...
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52 views
Verifying resident program “integrity” before every run
I am aware that operating systems verify authenticity & integrity of a program file while installing a program to a system.
My question is, do popular OS's provide a way to verify (and warn the ...
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1answer
321 views
Symantec rooted certificates trust and Oracle Java trust store, is Oracle planing to remove trust as well?
We are using Symantec CA rooted certs to sign JARs. Since Google and Mozilla have indicated that they are not trusting Symantec CA, should I be concerned that Oracle will remove trust from Symantec CA ...
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89 views
Verification of Python(x,y) installer
I'm an Aerospace Engineer just starting out in my field, I'm planning to start using Python, but I've run into a bit of a conundrum. I downloaded Python(x,y)-2.7.10.0.exe Windows installer from here (...
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296 views
Certificate and key abuse
I made a mistake several years ago by uploading OpenSSL certificate key (.pem and .pk8) into a blog post. The key was used to sign Android apk using SignApk.jar tool. Someone took it and used the key ...
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497 views
USBlyzer - Safe Or Not?
I need to use a USB analyzer. I've been looking at a couple of different options. This one came up. As far as I can tell, it's not open source, but seems to be quite popular. Seeing that the data ...
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2answers
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Who owns the gpg key 4AEE18F83AFDEB23 and how did it sign a commit in my GitHub repo?
This commit in my GiHub repo is signed by a key I don't recognize: https://github.com/jonathancross/jc-docs/pull/2/commits/124672699991af75dd2454831670758f08bc74ab
What is going on here?
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Resigned Windows app showing warning when downloaded
We have an Windows desktop application signed using a GoDaddy certificate. The certificate expired recently so, for the latest upgrade of the software, we went through the steps of renewing the ...
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1answer
141 views
How to make my homemade program not come up with security warnings?
I am an amateur developer and trying to make a exe file for windows that can be downloaded from the internet, or sent to my colleagues via email, but whenever it's opened it comes up with two warnings ...
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1answer
90 views
Is it reasonable to have the software hold something that the user can't tamper with?
I want to create a piece of software that will hold some information, the program works offline and I want to make sure that information can't be tampered with.
The program can create or alter it's ...
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1answer
641 views
Can I use the same ssl cert to protect my web site and sign my app?
I'm considering buying an SSL cert from my web host provider (smarterasp.net)
They list the cert as :
SSL-S Comodo SSL Certificate - Single Domain or Subdomain
Do you know if I can use that ...
