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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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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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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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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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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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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Code Signing and Validation

What are the possible approaches to prevent intended or unintended modification of tested(security) binary/source-code before production deployment? Scenario - Application team responsible for ...
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221 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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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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how to verify turbotax software

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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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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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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234 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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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511 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 ...
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Restricting allowed app signers

Android requires apps to be signed and since Nougat the signature acctualy guards all the parts of the APK file. However it seems that anyone can sign their app, and verifing the signature would ...
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Is signing safe from brute force attacks?

I am using itsdangerous to sign a string using a secret key. It says that the signing mechanism is HMAC and SHA1 and that it is an implementation of the Django signing module. Assuming I use one ...
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559 views

Expired Digital Certificate for an EXE

An EXE file that I downloaded from the official website has an expired digital certificate signature (1999 to 2015) That is it has been expired for two years. Is it still safe to run the EXE? There is ...
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438 views

Authenticode Certificate to avoid A/V

If I sign an executable with an authenticode certificate will any A/V stop flagging it as a virus?
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Dual Code Signing: Should SHA-1 signature have a SHA-1 or SHA-2 timestamp?

I am signing executables for our software both with a SHA-1 and a SHA-256 signature. In addition I timestamp both of these signatures. Here I am wondering: I can timestamp the SHA-1 signature with a ...
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How safe are the password prompts of the SafeNet eToken 5110 or similar cryptographic hardware tokens?

I'll need to use an hardware token, specifically the SafeNet eToken 5110 that comes with DigiCert's EV certificates, for code-signing on Windows. I know that they issue a prompt to manually enter the ...
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860 views

Possible to sign an imported key with a subkey using gpg?

In the interest of safeguarding my master key I store it offline. I have a gpg subkey with indicator SEA that I keep available on my system. When I download software I verify it using the provided asc ...
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Certificate owner information

Let's check this executable... This digital signature is OK. Ok fine. Name: Cocoa Nuts Unicorns Ltd Uhm that does not tell me anything. So, I have a valid signature and a valid certificate. ...
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Server side code signing

I'm currently implementing a couple of security improvements to a crypto currency trading website that handles all data client-side and uses a static file approach. One of the things I've been asked ...
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727 views

Using a HSM device for code signature generation

I currently generate code signatures for my open source package by using openssl. The way I do it is : Generate RSA private-public key pair (E.g. openssl genrsa) During packaging , I create a ...
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Can I use a code signing certificate as a TLS certificate?

For example, I develop a software which is used by some customers. They sign the software using their code signing certificates. The software has a client and a server part which are connected to each ...
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Smart-Screen filter still complains, despite I signed the executable, why?

First and foremost, this is my very first experience with Code Signing. I bought Standard Code Signing from Certum for 3 years. I intend to publish applications in Czech republic mostly. But to the ...
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Runtime checksum of Mach-O differs from executable checksum

In our iOS application we are trying to make an anti-tamper check. What we would like to apply is a common procedure used in anti-tapering techniques. We are trying to get the __text section of a Mach-...
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Does linux support signed binaries?

I am looking for something similar to what iOS supports. Does it exist in linux? With a secure boot (based in hardware chain of trust), doesn't it make sense to have signed binaries for security? ...
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Will digital signature prevent tempering, or at least harden the cracking, of my Windows applications?

I intend to buy my first digital signature intended for signing EXE files. In particular Certum Standard Code Signing caught my eye. It is SHA-2 based with up to 4096 RSA. Is it worth my money if I ...
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Can android application be repacked with original developer's signature?

I am researching on Android application repackaging. I know the original developer self-signs the APK. Is it possible for a hacker to fake the signature and make it appear as the original signature ...
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Why should I sign git commits/tags? Should I sign both commits and tags?

Easy question, but no one has asked it here as far as I see: Why should I sign git commits? To give some more things to answer there is also this question: Why should I sign git tags (releases)? And ...
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Why does Microsoft use a digital signature catalog instead of a signature in the executable?

I own a code signing certificate, so I can add digital signatures on files that contain executable code. Microsoft seems to use a "new" way and provides most digital signatures not in the file itself ...