Questions tagged [x.509]

X.509 is a standard for a public key infrastructure used for authentication and access control. X.509 specifies standard formats for certificates, revocation lists, attribute certificates, and path validation.

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How are “Certificate Signing” key usage certificates restricted to what domains they can sign?

Many big websites use their own intermediate signing certificates to generate SSL certificates for their domains. The intermediate certificates are issued by the usual root CAs but have a "Certificate ...
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Can I sign a new certificate with a previously paid for certificate [duplicate]

For the last few months, I have been using self signed certificates to provide ssl for a system that I have been building. We are now getting ready to start getting external users on the system, but ...
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Recommended key usage for a client certificate

My program has the following flow: a client sends a CSR to server, the server sends back a client certificate and after that the client communicates with the server to a path that requires a ...
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The reason to insert Subject Alternative Names into CA certificate

I am trying to understand meaning of the Subject Alternative Name extension. The reason of usage it in SSL X.509 certificates or other end-entities certificates is mostly clear for me. However, I ...
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Can Subject Alternative Name(SAN) Certificate install on different Web Server or OS?

Let say: application.house.com apache tomcat : physical server email.house.com apache tomcat : virtual finance.house.com Oracle Wallet Manager : physical server ...
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Are certificate authorities required to obey to the signature algorithm (hashing) specified in the CSR?

I was playing a little bit with signature algorithms, trying to determine which CAs among the ones I use are currently issuing SHA2 certificates. I generated a CSR specifying the SHA256 hash (either ...
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Must the distinguished subject name of an issued SSL Certificate match that of the generated Certificate Signing Request?

For example: from Issued SSL Certificate: CN = abc.com.my, OU = Room, O = House, C = MY from generated CSR: CN = abc.com.my, OU = Room , O = House, L = KL, ST = KL , C = MY Is it legal for a ...
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This certificate has an invalid digital signature

I am trying to learn securing wcf service using ssl. I found this website and I am following the steps. http://robbincremers.me/2011/12/27/wcf-transport-security-and-client-certificate-authentication-...
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Self-signing client certificates and distributing them, is the following a sound procedure?

I have a case at hand as follows: There is a number of clients in Internet (i.e. untrusted channel), initially in hundreds but growing in numbers. There is a server doing processing related to these ...
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How to safely renew user and CA certificates in a PKI

I am currently developing my own PKI where x.509-client-certificates are issued by a public server. At the moment, the CA-public key is distributed with the binary and there are no routines for ...
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What is the difference between openssl and mkcert and IIS self signed certificate

What is the difference between openssl and mkcert. Which one should I prefer. I want to create an IIS hosted WCF service. Which one should I use to create an SSL certificate. Also, there is another ...
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determine X.509 certificate class

I am very familiar with OpenPGP but don't even use X.509 / S/MIME. I know that there are several classes for certificates (from email check to personal ID check). I would like to know how you ...
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Do SSL / X.509 certs cover all ports for a host?

Or are certs both host- and port-specific (excepting wildcard certs)? I would assume they aren't, because they're supposed to verify a domain, but at the same time I've never seen anyone run HTTPS on ...
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How to encode a username in PKIX certificate?

I was reading through RFC 5280, PKIX Certificate and CRL Profile, Section 4.2.1.6, Subject Alternative Name: The subject alternative name extension allows identities to be bound to the subject ...
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x509 serial number - hex or decimal

When I run the openssl command openssl x509 -noout -text -in certname on different certs, on some I get a serial number which looks like this. Serial Number: 256 (0x100) On others, I get one ...
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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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How to get “Policy: X509v3 Any Policy” in a certificate generated with OpenSSL?

I am trying to generate a certificate through OpenSSL which has the following line X509v3 Certificate Policies: Policy: X509v3 Any Policy But I end up getting X509v3 Certificate Policies: ...
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Generating deterministic X.509 certificates?

Is there a way to deterministically create an RSA private-key for an X.509 certificate, ideally through a library which has been vetted already? i.e. user enters some phrase like "this is my private ...
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CSR's with null bytes in them

According to wikipedia.org's article on X.509 certificates, "There are implementation errors with X.509 that allow e.g. falsified subject names using null-terminated strings Marlinspike Blackhat 2009 ...
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Creating an X.509 certificate with an invalid signature

Creating an X.509 certificate with a valid signature with OpenSSL is pretty well documented all over the Internet. There are instructions on creating certificates that are signed by themselves and ...
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Certificate authority structure - best practices

I'm working for a company that sells software products to customers some of which do not have the resources and/or know-how to build and maintain their own CA (used for the SSL communication of our ...
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Security weaknesses in using RSA encrypted MD5 hash of certificate content

Suppose you have an Internet banking site based on a secure web server running the HTTPS protocol via port 443. The server authenticates itself to clients through an X.509 certificate signed by a CA....
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Can a certification authority sign another CA's certs?

Disclaimer: I have low knowledge of X.509 and PKI, so I would appreciate an answer that is not entirely technical, i.e. by using real-life example scenarios.) I was searching for information about ...
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Certificate request - why does the requester have to create a private key?

If remember right, then before I send a CSR (Certificate signing request) to the CA, I have to create private and public keys. Then I use the public key to encrypt my personal details before I send ...
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Determine if private key belongs to certificate?

Given a certificate¹ and a private key file², how can I determine if the public key on the certificate matches the private key? My initial thought was to simply encrypt some text with the public key ...
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Load balancer and two machines - how many SSL certificates do I need?

We have a load balancer facing the Internet. It's balancing load towards two systems behind it in the back-end running apache. How many SSL certificates do I need to buy? - One for the load-balancer ...
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X509Certificate - How to set validation Policies?

I have an X509Certificate (say Certificate-A) for signing purpose. While validating this certificate, I have to check its path with Intermediate & Root certificate which I have implemented fully. ...
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Kohnfelder Certificate [closed]

The Kohnfelder certificate standard is very similar to that of X.509 certificate standard. Comparing the two standards, does one have an advantage edge over the other? or what are the pros and cons of ...
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can a x.509 certificate alone be used for user authentication?

we have a scenario for implementing SSO using x.509 certificates. A secure client will download a x.509 certificate (only certificate...no private key is available) upon user logs into the windows ...
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Certificate verified using two different paths

StartSSL has an intermediate certificate that they use to sign their EV certificates: sub.class4.server.ca.pem. This certificate's issuer is shown by openssl x509 to be /C=IL/O=StartCom Ltd./OU=...
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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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Why do public key certificate “Trust anchor”? Does this introduce a single point of failure?

When you look at currently used concept of Root CA (primarily in SSL/TLS context), you can see a single-point-of-failure vulnerability, which means, if your private key is disclosed, you automatically ...
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OID for creation date/time (X509 certificate field)

X509 certificates used in PKI{X} have notBefore and notAfter dates. I'd like to stamp a certificate with a creation stamp, and the stamp is distinct from notBefore and notAfter. Is there an OID for a ...
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google certificates correct CA [closed]

I view certificates of https://www.google.com.ua/ So I thought, when requesting via cURL, if I point by CURLOPT_CAINFO to those certificates (GeoTrust Global CA and Google Internet Authority G2 in ...
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Can anyone explain how to use an X509 client certificate to securely authenticate a user?

Bit of background. Web Application that can generate Pub/Priv Keys and X.509 certificates. How would I make use of the certificate in a web application, username and password login form to provide ...
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Specify port for cRLDistributionPoint?

cRLDistributionPoints is OID 2.5.29.31. Here's what one looks like under Gutmann's dumpasn1: SEQUENCE { OBJECT IDENTIFIER cRLDistributionPoints (2 5 29 31) OCTET STRING, encapsulates { ...
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Specify multiple ips in a certificate

I created an x509 certificate using gnu certtool, in the certificate template i specified cn=myip Problem is that each time I change my network I need to remake the certificate because my ip changes......
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Why does the RFC 5280 dictate the CAs not to issue certificates with negative serial numbers?

I have tried to issue a certificate beginning with 8 to F but I have found it is impossible, mostly due to the RFC: The serial number MUST be a positive integer assigned by the CA to each ...
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Best way to set up SSL certificates for consuming web service from Azure

I need to purchase and install the correct Verisgin SSL certificate(s) (X.509) on Azure. I have never done this before and would really appreciate some advice on how to go about it and what is ...
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Private Key and Public Key Serial Number and Thumbprints

Are the private key Serial numbers and thumbprints the same as the corresponding public key Serial numbers and thumbprints for certificates (X509Certificates, Base64-encoded X.509), and are these good ...
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inquiry about SHA1 with RSA for certificate signature

As you all know, plenty of X.509 Certificates use (PKCS#1 SHA1 with RSA encryption) as the Certificate Signature Algorithm for generating the signature of 2048 Bits long. We know that SHA1 hash ...
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Root certificate key usage (non-self-signed end entity)

This discussion does not include self-signed end entity certificates for hosts like web servers and mail servers. OpenSSL's default configuration for a CA certificate has the following keyUsage: ...
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How to validate a client certificate

My understanding is that when using a client certificate for security one issues a private and public key cert (for example X509) of some sort and sends that of to the consumer of the service that one ...
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1answer
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What do people mean by “top-down manner” in X.509 certificates?

What do people mean by saying that X.509 certificates work in "top-down manner"? Do they say that because CAs can do cross certifications?
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Trust a non-root CA in OpenSSL

Is it possible to have OpenSSL trust a non-root CA such that a certificate signed by that non-root CA can be properly verified? I've noticed that the default behavior for OpenSSL is to only verify ...
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Is it typical to create both x509 and OpenPGP key pairs?

I'm looking into increasing my use of signed and encrypted "things" - LibreOffice Documents, Off-the-record chat, PDFs, emails, etc. I'm finding that some things only support x509 format-certificates, ...
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How is an Authenticode timestamp verified?

For an Authenticode signed file to be verifiable by Windows after the original signing certificate has expired (typically 1-3 years after issue), the file also needs to have a cryptographically signed ...
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Choosing the right X.509 certificate infrastructure for securing LAN communications between a PC and a device

Edit: seems like I was quite hasty when typing in my question at first, so here is an updated version of it. I am developing an application that runs on PCs which are on the same LAN as other devices....
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user identity certificate

I want to create a new scheme for user identification, like X.509 certificates, but not X.509. Is it possible to use this new certificate over the existing Internet? and if yes, what are basic ...
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Two way delegation?

I am looking into using the X.509 for mutual delegation where mutual delegation is bi-directional where an entity can only delegate a task or a set of permissions to another entity if the latter is ...

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