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Questions tagged [certificates]

A piece of data used in public key cryptography (specifically public key infrastructures) 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. For questions specifically about [x509], [certificate-authority], or [public-key-infrastructure], please use those tags.

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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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1k views

iOS & Android Certificate Pinning with Lets Encrypt

We use cert pinning when developing for iOS and Android. We use regular 12 month certs that are paid for. We recently switched to Lets Encrypt (LE) for our general website certificates and would like ...
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125 views

.net website using certificate with .com

I found a website where all browsers navigate to just fine and do not complain about the certificates. When i inspect the certificate i noticed something i hadn't thought i would see. the website foo....
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1k 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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368 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 securely ...
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127 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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1k 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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65 views

What is the maximum amount of certificates that can be pinned with HPKP?

We are currently looking into enabling HTTP Public Key Pinning on our website. The problem we are currently facing is that our certificates last only 90 days, but we have devised the following steps ...
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181 views

Why does the TLS Client have to send the digital signature over all previous handshake messages in CertificateVerify?

TLS (non-anonymous) Handshake requires the Server to sign the ServerKeyExchange message so that the Client can authenticate the Server using the public key present in the Server Certificate. However, ...
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367 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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21 views

RFC 5280 compliant certificate with x509 extensions

First time posting here, be gentle. Situation: I have a requirement, to link our printer/scanner to our Azure AD (so that it can lookup users etc.). I have enabled Azure AD Domain Services with LDAP ...
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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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Delegating SSL certificate requests to a third party

I'm wondering what best practices are regarding delegating the authority to approve SSL certificate issuance. One of our vendors (www.vendordomain.com) will soon host a Web application for us (www....
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281 views

Why is hotmail mail server providing an invalid certificate?

It seems that hotmail.com mail server sitting at hotmail-com.olc.protection.outlook.com is using a TLS certificate issued to mail.protection.outlook.com. Both the mail server hostname and TLS ...
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339 views

Storing Wireless auth certs in a TPM

Within my organisation we're being asked to provide a secure but seamless wireless experience e.g. user logs on to Windows device and are connected automatically to corporate network via wireless. ...
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82 views

Custom keystore/certificate to hold asymmetric (RSA) keys

My app will require maintaining an RSA keypair locally on the user's machine. I was a bit disappointed to discover that PKCS#12 and JKS don't offer higher than 3DES (correct me if I have this wrong). ...
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How can I create a verifiable signature for a digital transaction?

I am currently working on creating a digital signature pad that customers can sign instead of a traditional paper receipt for credit card transactions. Currently I have the ability for them to sign a ...
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112 views

Resolving dupe CA certs in keystore

Consider a keystore in which are loaded two duplicate CA Root certificates. They have the same Issuer/Subject DN and the same key. The major difference is that one expires in 2019 and one expires ...
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114 views

Does any SSL certificate vendor allow custom expiration date while creating the SSL Certificate?

The public SSL certificate vendors (Comodo, Thawte, etc.) allow you to create certs that expire after a certain fixed period (1 yr, 2yr, 3yr, etc.) from the date of creation. However, I would like ...
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Windows NPS: Policy should check Issuing CA

I have some trouble in configuring a Windows NPS, maybe anybody of you have an idea. Is it possible for NPS to check whether a client certificate was signed by a specific issuing CA? I have two ...
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166 views

Security Concerns of importing SharePoint Root Authority to Trusted Root Certification Authorities store

We are experiencing slowness because of SharePoint's STS certificate CRL checking. This is a known issue and there is a Microsoft Workaround for it: https://support.microsoft.com/en-us/kb/2625048 The ...
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765 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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94 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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135 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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76 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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131 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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336 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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607 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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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: 0_.].[0Y0W0U..image/gif0!0.0...+......
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Extracting .p12 cert and key without OpenSSL

I've asked a question on SO, but was directed here since it might align better with this SE. The problem I have is that I need to extract the certificate and key in unencrypted PEM format for use in ...
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88 views

Why is certificate rejected in firefox, but not IE and Chrome

Question: Is a certificate issued to a subdomain valid for a CNAME in the parent domain assuming a common root CA cert and SAN listing both? (I think the answer is no but I'm uncertain). Is there a ...
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58 views

Is Mobile ID secure? Certificates on SIM card (Mobile identity management)

In Switzerland Mobile ID is popular. It looks like it's international known as Mobile identity management. Mobile identity is a development of online authentication and digital signatures, where ...
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Why is digital signature enforcement on webservers not common practice?

Why is it that server admins do not code sign the contents of their webservers (all php, css, js, etc.) and have Apache / NGINX / whatever server software refuse to execute or serve any code / ...
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142 views

Digital Signature is not valid

I recently received a digital signed email from a friend and the certificate is issued by COMODO RSA Client Authentication and Secure Email. My problem is the thunderbird detect it as a "Not Valid ...
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114 views

Replying to a digitally signed email using thunderbird

So Basically I sent a digitally signed email using a certificate issued by Sectigo RSA Client Authentication and Secure Email CA. Now the recipient of the email replied to me with a certificate ...
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491 views

Use self-signed certificate inside of Docker Container for localhost

I've created a self-signed certificate for localhost to use https. I'm running an Apache Docker container which uses the self-signed certificate and the private key. I then installed the certificate ...
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Is distributing software with KeyStores as resource secure?

I'm working on a client / server application. I want to encrypt the communication between the two. This GitHub project served as a starting point for me. It uses SSLEngine to establish a secure ...
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Using build time generated, self-signed certs for inter application authentication

I need to be able to authenticate requests between different applications I am responsible for. My company does have CA signed certs, but there are two problem with using it for this purpose. ...
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Origin VS Authority and Domain certificates and Unique IPs

Disclaimer, I am new to InformationSecurity, so sorry if I not following rules as good as expected. I asked this post on stackOverflow, and I was suggested to transfer it here So far I get: Origin = ...
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58 views

Non-TLS-authoritative ZSKs?

Under DANE, the digital chain of trust goes (roughly): [Public visibility of the ceremony for the generation of the] ICANN Root Zone Key, which something something involving the TLD authorities and ...
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159 views

Lets Encrypt + Cert Bot: Setting up known Certificate Authority

I have a setup in docker where I have LetsEncrypt ACME Boulder + CertBot + DNSMASQ as a DNS Server. Additionally I have a client and a service where the service is served over https only. I had ...
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Product & Feature Comparison of EJBCA, Active Directory Certificate Services, or Entrust Authority Security Manager?

I'm currently beginning analysis in this field and stumbled across the thread titled: "Comparison and difference between CAs" The question seems largely unresolved. Does there exist any product or ...
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Best way to back up locally stored Certificates

What is the best way to back-up all the locally stored certificates on Windows 7? An adware Trojan has installed fraudulent certificates as part of its payload. Before I alter anything, I want to ...
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93 views

How do I examine a fresh Windows 10 installation

I suspect an unauthorized modification has been applied to a fresh new installation of Win 10 x64 and/or a PC running it by a person who knows me personally with the purpose of tracking my activity ...
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107 views

Client authentication using certificates in M2M communication

We're planning to implement following scenario for a secure machine-to-machine (M2M) communication network. We have some gateways and a lot of secure sensors which should only be able to "speak" to ...
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76 views

Signing with multiple end entity certificates

Let's assume we are having a structure with a root certificate with lots of "child" certificates. A message is transmitted which is signed by any of the child certificates. The receiver has stored ...
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258 views

How to make CNG certificates available for mutual authentication in browser?

I have implemented a CNG key storage provider and propagate my certificate according to the answer to this question to the MY store. I can see my certificate there using the MMC console. However, when ...
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Does using the same curve certificate on both ends cause security issues?

I have the following scenario: an application that establishes a full mesh connection with itself on a remote server. We use 0MQ and curve certificates for security and authentication, but at the same ...
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649 views

Check the signature algorithm of RDP certificate

I received a Nessus warning of RDP as following, The following certificates were part of the certificate chain sent by the remote host, but contain hashes that are considered to be weak. |-Subject ...
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161 views

Invalid certificate error appears on my web server for 10 minutes and then disappears

I have a raspberry pi that hosts a web server and has a DDNS registered through no-ip. I just had an issue connecting to my webserver because a certificate appeared to be installed on this server that ...