A piece of data used in public key cryptography that contains identifying information (i.e. email address or web address), a hash of a public key, and a digital signature that authenticates the data in the certificate.

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Modify Certificate Subject using OpenSSL x509 Command

I'm building a CA based on the OpenSSL command line tools. I don't want to use the openssl ca tool and its file based database though, instead I create certificates using the openssl x509 tool ...
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263 views

Untrusted connection when logging to stack exchange sites

I was able to log into various stack exchange sites with no problem, but as of today 1/5/2016 I'm getting the following error message with firefox 43.0.2: You have asked Firefox to connect ...
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47 views

Certificate and Path validation for S/MIME

I am working on a S/MIME client development and was wondering if there is a list of certificate and path validation checks that a client needs to perform while validating an email signature. My ...
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71 views

If I install a certificate for the purposes of logging into a Wifi connection, is it still safe?

There are some wifi networks (large universities for example) which use HTTPS to get to a login page, and in order to verify that they have not been spoofed, provide the certificate ahead of time ...
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24 views

How to enable self signed certificates in Windows 10?

I want to use a Yubikey 4 with Windows 10 Pro for Bitlocker and login with my TPM. Unfortunately, I found out I need to enable self signed certificates and all the guides on the Internet I found were ...
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24 views

Finding the EMSA-PKCS1-v1_5 DigestAlgorithm field in the x509 certificate

From the RFC - https://www.ietf.org/rfc/rfc3447.txt A.2.4 RSASSA-PKCS1-v1_5 For each OID, the parameters field associated with this OID in a value of type AlgorithmIdentifier shall have a value ...
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75 views

Windows certificate verification with timestamping

I have been trying to replicate the behaviour of the Digital Signatures tab on windows file properties. I'm using WinVerifyTrust api and X509Certificates namespace to achieve my goal. I've managed to ...
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46 views

Windows IIS Event/Security Log ID of Private Key deletion of corresponding TLS certificate?

I'm in the middle of writing an MS Active Directory Certificate Services Key Management Lifecycle document for my organization. The primary purpose certificates will serve for this organization is to ...
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70 views

What are the formal methods to analyze Authentication Protocol

I designed an authentication protocol for consumer-producer applications, which barrows features from Kerberos and Tesla. To check the strength of protocol I considered different well known attacks ...
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70 views

Security implications of CA signed SSL cert for local development

Curious to know the security implications and potential risks involved with getting a CA signed cert for localdev.mydomain.com, and issuing it to all the developers who might need to spin up a local ...
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95 views

OAuth2 Authorization and Resource server certificates

I'm implementing a custom IAuthorizationServerHost using DotNetOpenAuth library. Example implementation uses two certificates for CreateAccessToken (see Listing 6): public AccessTokenResult ...
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892 views

Safe communication via rest api between two known servers

I'm using Kinvey as backend but because it doesn't provide the ability to run custom code I have set up another server. So basically when x happens on Kinvey server, I send a call to my rest api on ...
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29 views

OCSP recording with JMeter

How can I record an application which is using OCSP security with the help of JMeter? I am not able to record the application i.e. a native app with the help of JMeter as it is using OCSP protocol ...
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28 views

How to provide our customers ability to self service client certificate creation?

We have an API for B2B customers to access our platform. We require each B2B customer to have a client certificate. This is not the URL SSL certificate (https). The CN of each customer's client ...
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31 views

What comes into calculation of certificate signature?

I have written my own code with openssl in order to create certificates. In order to verify this code, I tried to reconstruct an openssl commandline generated self-signed certificate ... openssl req ...
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57 views

What Key Usage values are required to support Code Signing?

I have a .pfx that I want to use to sign a Clickonce app. However, on trying to do so, Visual Studio gives me "The selected certificate is not valid for code signing." When I go to certmgr.msc and ...
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36 views

How Do I Create a Production Client Authentication Certificate for Azure Key Vault?

I am learning about Azure Key Vault, and one of the scenarios it supports is certificate authentication, which you can read about here. The samples do a great job of explaining how to make a ...
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45 views

Why does SubjectAltName not turn up in my CSR?

Does the CSR generated contains the SubjectAltName I have configured the openssl.cnf file to support extensions and when i dump the CSR i can see subject is available not the SubjectAltName This is ...
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27 views

Problem using custom CryptoNG KSP on IE 11

We are currently developing a custom KSP (Key Storage Provider) for a Key Storage System. We successfully developed a CSP (CryptoAPI) and a KSP (CryptoNG) provider, and both work really fine for ...
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53 views

Theory behind certificate for job account

I made it work a job account protected by a certificate in a java spring application but is not that clear to me the minimal steps.(Could you believe that :) I need some theory. Here my steps: ...
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263 views

Certificate Transparency, TLS Extension method of serving SCT's

I was curious about how to supply certificate transparency from my web server. There are 3 ways certificate transparency information can be delivered to the client's browser (Source: ...
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130 views

How to generate “CRL numbers” for X.509 CRL

(Context: I'm working a process to publish a CRL periodically -- eg once every day.) With standard X.509 certificates, "serial numbers" are required to be positive integers, but they do not need to ...
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149 views

Making the Firefox key and CSR creation process transparent

Background I was a bit surprised that several CAs do not allow anymore to send a plain old CSR in text form to them which was created in the classic fashion with OpenSSL or similar. But this would ...
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89 views

Does Activesync certificate authentication replace a password, or act as 2 factor?

I am looking at Activesync authentication and want to know if Certificate Authentication ignores a client username and password or Certificate Authentication requires a username and password ...
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38 views

What are some scenarios I would use MSFT Certificate Enrollment Web Services?

The Certificate Enrollment Policy Web Service and the Certificate Enrollment Web Service are made for non domain connected machines to retrieve certificates of various kinds. When setting this up, I ...
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65 views

Certificate advice for deploying code-signed software as a 3rd party vendor

I am in the process of developing an application for an organization, and am looking for a sanity check on my strategy, especially given the the nature of the SuperFish nonsense that was exposed. The ...
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97 views

Can't get my SSL CA to work with Apache

So I have an SSL enabled website running on Apache2. https://eamorr.com (I get a warning in my browser, as expected) I have a config file for this website at: ...
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70 views

Setup local Certificate Authority & integrate with SCEP

I want setup local Certificate Authority and issue X.509 certificates under my CA. In order to achieve this I am exploring following options such as: OpenSSL/OpenCA BouncyCastle Cryptographic APIs ...
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266 views

Connecting to postgres with SSL

I need help understanding some basics about the postgres database server and SSL. I am developing a Windows desktop application that will connect to a postgres database, in single user mode, with both ...
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149 views

Is a android app signing certificate unique?

The Certificates that are used to sign Android applications are generated by the user and not checked or signed by any authority. They are RSA or DSA Certificates and as i read on ...
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207 views

1.3.6.1.5.5.7.1.12 Logotype extension - how can it be generated from openssl command line

If you look at this subCA Certificate from Verisign http://www.tbs-certificats.com/FAQ/en/495.html?p=en/495.html It has the following field 1.3.6.1.5.5.7.1.12: ...
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44 views

Is SCEP safe if I use a different long and complex password per enrollment, and validate it against expected parameters?

I'm considering using SCEP to enroll iPads and other devices in my network. The iOS configuration profile allows me to configure a different password for each device. Is it valid, and safe for me to ...
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258 views

Does Mac OS X 10.8+ support self-signed Package Installer

I'm not sure whether self-signed Package Installer are supported by Mac OS X 10.8+ Using informations in How to create an Apple Installer Package Signing Certificate I could create a Package ...
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40 views

Question about the Perspectives add-on, is this dangerous?

When I visited Google and Facebook, and then clicked on the Perspectives add-on button to check the certificate information, I saw this:     What does this mean? Shouldn't it have ...
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164 views

Deploying software that requires X.509 certificates

I have a self-hosted WCF application, with a server application running on the server (obviously) and a client application that will be installed on the users PC. Up until this point I have been ...
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56 views

Does Active Directory Certificate Services support Card Verifiable Certificates?

Does Active Directory Certificate Services support accepting requests for, and generation of, Card Verifiable Certificates (TR-03110)? If so, in which version of Windows Server was the functionality ...
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239 views

“Keyset does not exist” when using SignData function with RSA

"Keyset does not exist". I know that there are tons of question about this error, but mine is totally different. I'm not gona use the key from windows certificate store, but load the public key & ...
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128 views

What are some good design practices for cross-platform certificate storage?

Question from the Bouncy Castle development list: At present we use the Windows certificate store as: var store = new X509Store(StoreName.My, StoreLocation.LocalMachine); ...
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38 views

Cannot be verified error when installing LetsEncrypt SSL certificate on Tomcat

We have a Debian 7 X64 server running Apache Tomcat on which I am trying to install a certificate from LetsEncrypt. I am partially successful as I am getting an error where certificate verification is ...
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18 views

Securing several Servers (Certificates)

I got a Question regarding Certificates. We got a situation, where only "Server 4" and its clients are given in the picture above. That Server4 (SLES11) and its Clients are using a self signed ...
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16 views

Does the AppId matter when self signing a cert?

We are going to start using self-signed certificates on our dev server. I went through some step-by-step instructions on how to generate the cert and set up ssl with my service. To add the cert, I ran ...
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31 views

How do the eduroam WPA-Enterprise 802.1X certificates look like?

As outlined in another answer, the official eduroam WiFi profiles available from https://cat.eduroam.org/ (verified for uWaterloo and uOttawa), as well as sample official instructions of the ...
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27 views

SpriteKit Level Data Security Handling

I have been reading many different posts, threads, etc. regarding the best practices to store level data to be used throughout a game application (level boundary data, images, characters, time, etc.). ...
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48 views

Validation client certificate for site in iis

Input: I send client certificate to client. He uses it to work with my web application which works in IIS. I installed CA certificate (which was used to create client certificate) on web server. AFAIK ...
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38 views

Applocker rules Publisher vs hash

I'm interested in deploying application white-listing for a large scale environment by using the Windows Server built-in AppLocker mechanism. There is no Internet connection to the environment. My ...
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25 views

Is there any extra validation that Firefox perform to certificates serial number

I open a secured site in my computer. for my reasons, I created new certificate every 15 minutes. I noticed that, sometimes, Firefox "doesn't like" my certificate. after little investigation, I ...
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48 views

deceptive digital signature?

I am new to cyphering and I try to understand this case : my government sends me so-called "digitally signed" PDFs, as you can see below (text only, after "Thanks"). Although there is a certificate ...
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23 views

Different KeySizes from Different Stores same pfx

Sorry, i'm new to all of this. I have a question as to why the KeySize of a RSACryptoServiceProvider will differ between Store Locations? I've imported the same pfx in the LocalMachine store, as ...
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219 views

Cannot connect to SSL site in Safari only on Windows and Mac

I am having an issue with users connecting to my site via SSL on Safari - this is both on Windows and Mac so it doesn't appear to be OS specific. When they try to connect they get an error: Safari ...
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71 views

Certificate policies extension in Root CA and Issuing CA

I am building new CA chain and PKI and I actually don't fully understand how I should include certificate policies (CP) and certificate practice statements (CPS) as extensions and how to work with it ...