A Certificate Authority is the collection of hardware, software, and people responsible for issuing certificates in a hierarchical PKI. CAs may be public, as in SSL / TLS and government IDs, or private, as in corporate infrastructures. The primary responsibility of a public CA is to verify the ...

learn more… | top users | synonyms (1)

0
votes
1answer
254 views

SSL Auth to proxy using Certificate on Client-side

The question may need to be reworded. The server-side is set up with Squid3 acting as an Authenticating proxy by way of LDAP. I did this for testing purposes to make sure everything was working. I ...
4
votes
1answer
104 views

What is the meaning of http://uri.etsi.org/TrstSvc/eSigDir-1999-93-EC-TrustedList/SvcInfoExt/RootCA-QC from ETSI TS 102 231 V3.1.2

From Technical Spec http://uri.etsi.org/TrstSvc/eSigDir-1999-93-EC-TrustedList/SvcInfoExt/RootCA-QC a Root Certification Authority from which a certification path can be established down to ...
1
vote
2answers
173 views

SSL-certificates for overlapping domain regions?

Suppose, a server hosts https://www.master.com/ and thus is equipped with a (single domain) SSL certificate. Furthermore, suppose there are some web apps below master.com: ...
34
votes
4answers
5k views

What alternatives are there to the existing Certificate Authority system for SSL?

Whilst the current CA system works very well for a lot of people, it does put a lot of power into individual CAs' hands, and makes a CA hack potentially devastating for customers and business. What ...
6
votes
4answers
3k views

Can an intermediate CA be trusted like a self-signed root CA?

Is it possible within the limits of the X.509 specification to mark an intermediate CA as trusted for a specific purpose, e.g. to verify a VPN, HTTPS etc. server key, just like it would work with a ...
3
votes
2answers
6k views

Public Key → Certificate?

Is it possible to convert a public key to a certificate using the public key only? I've seen the following, which takes a private key to form a cert request, which can then be self-signed: openssl ...
3
votes
3answers
840 views

Where to get/buy a CSR generated S/MIME certificate

I'm not sure if the question is eligable for this board as I ask for concrete service providers which can be kind of advertisement, but there is also technical issue involved, so I give it a try. My ...
4
votes
1answer
246 views

Remove CA from trusted CAs list while trusting it older certifications

Lets say that some certificate authority changed her security policy and we don't trust her new certifications. Is there any convenient way for an organization to remove this certificate authority ...
3
votes
2answers
687 views

Inspecting a TLS Certificate to determine RSA Key Usage restrictions

With regard to this answer, I have a question about Key Usage in an SSL certificate. Most SSL server certificates have a RSA key which is not restricted through a Key Usage extension, so you can ...
14
votes
3answers
3k views

Can a wildcard SSL certificate be issued for a second level domain?

Something like *.com or *.net? How about *.edu.au? The RFC 2818 does not say anything about this topic.
0
votes
1answer
3k views

Why IE/Windows forces you to install self-signed certificates as root CA to make them work?

In old versions of IE/Windows you could install a self-signed certificate for a web site and it just worked: the warnings disappeared. In more recent versions (and with Chrome) this just didn't work. ...
8
votes
2answers
2k views

Obtaining an S/MIME certificate without disclosing my private key to the TTP

I would like to obtain a trusted S/MIME certificate, but all the certificate authorities I have asked so far generate the keypair on their server, sign the certificate and send me both the private key ...
4
votes
1answer
115 views

Are there any public examples of an encrypted attribute in a Verisign-issued certificate?

This Credentica- UProve paper describes how Verisign issues (or did issue in the past) certs with encrypted attributes: "VeriSign issues certificates that contain encrypted attributes that can be ...
6
votes
2answers
978 views

Root SSL certificates and browser support

I have given three certs to be install on nginx AddTrustExternalCARoot.crt PositiveSSLCA2.crt www_example_com.crt So I concat them into a chained cert cat www_example_com.crt PositiveSSLCA2.crt ...
1
vote
1answer
578 views

Generate CSR with 2 OU Names

I have to create an application which generates a CSR. While generating a CSR we are required to fill in several details like CN, OU, etc. The problem is that the Certifying Authority to which I have ...
1
vote
1answer
2k views

Windows' default certificate store for intermediate vs trusted root certificates - my self signed root CA cert goes to 'intermediate' by default?

Is it possible to create self-signed root CA certificate that Windows will import to Trusted Root by default instead of Intemediate certificate store ? Obviously, it won't do it without the big giant ...
8
votes
1answer
753 views

Force a subordinate CA cert to be signed to include a the CRL distribution point extension?

How can I attach a crlDistributionPoints parameter when signing a CSR I've generated as follows: openssl req -new -key /root/ca/private/private.key -out /root/public.csr I usually sign with: ...
3
votes
2answers
672 views

Should I customize my Root CA's thumbprint/fingerprint? (SHA1 or MD5)

My goal is to make a certificate's thumbprint "easier" to verify, and not reduce security in doing so. Given that the RSA-based Bitcoin technology has a concept called a "Vanity address" where the ...
9
votes
4answers
564 views

How to stop/detect someone else registering a certificate for my domain

With the proliferation of low-cost automated CAs what can be done to mitigate the attack of someone doing a spear phishing attack to get a login to our webmail system, then using an automated service ...
6
votes
3answers
3k views

Why are Certificate Revocation List periodically renewed?

While studying a security course I have been asked this very question: Why are CRL periodically renewed, even if there are no new revoked certificates to add to the list? Honestly I can't find the ...
5
votes
3answers
1k views

Why do we allow SSL certificates to be replaced before their expiry date, without revokation of others?

Imagine a situation where a rogue CA creates a certificate for your site. Since the user's browser trusts the CA, it will accept the certificate without any fuss. However, the site's real certificate ...
13
votes
1answer
2k views

Renewing Microsoft Certificate Services Root Certificate

We currently have Microsoft Enterprise Certificate Server installed on a domain member machine which issues 1 year certificates to users for authenticating to VPN. We'd like to start issuing web ...
8
votes
1answer
1k views

Moving from a one tier to a two tier Microsoft Certificate Authority hierachy

Right now we have a single Microsoft Enterprise Root CA which issues certificates to our VPN users for two factor authentication. We're planning to extend use of the CA to issue certificates for RDP ...
6
votes
2answers
5k views
5
votes
1answer
4k views

AIA/CRL locations for Offline Root

I've read the answer to the following "Checklist on building an Offline Root & Intermediate Certificate Authority (CA)" and I have one questions based on the system I am trying building It's an ...
165
votes
7answers
18k views

How do certification authorities store their private root keys?

Knowledge of a CA private key would allow MitM attackers to transparently supplant any certificates signed by that private key. It would also allow cyber criminals to start forging their own trusted ...
3
votes
1answer
514 views

Internal CA for Digital Signature Solution - PKI Based

I'm trying to set up a digital signature solution which would work with a internal PKI. We have considered Microsoft Certificate Services, but we don't want to rule out any other option to set up a ...
2
votes
3answers
1k views

Public key Infrastructure

Here the MD5 hash is being encrypted with the private key of the sender. But I read in a paper that private key is only used for signing and not encrypting. Is the image wrong or can private key ...
1
vote
1answer
639 views

are organizations that receive certificates considered “end entities” in a PKI?

I am trying to understand the term end-entity. Does this term just mean anybody that plays a role in a PKI system that is not a CA? So if I request a certificate from A who is a CRL issuer for ...
3
votes
3answers
617 views

Why a self-signed digital certificate (X.509) cannot be altered?

I'm not experienced in code signing but I was thinking about this: as you know, there are various tools for self-signing digital certificate generation (as makecert from Windows or OpenSSL). Now, It ...
4
votes
2answers
1k views

What to do with expired certificates as a CA?

This and this answer says that "once a certificate has expired, the CA ceases to keep track of its revocation status". I'm trying to learn how OpenSSL works as a CA. If I have a revoked expired ...
17
votes
3answers
877 views

Can a nation-state adversary perform a MITM attack by compelling a CA to issue them with fake certs?

As I understand it, with any encryption system based on a trust chain / CAs (eg SSL, TLS, S/MIME), it would be possible for a nation-state adversary (such as the NSA) to compel the CA to issue them ...
-1
votes
1answer
161 views

Who can view my https browsing habbits? [closed]

I was wondering about HTTPS security and how easily is compromised. I have already read the similar threads in here, but I have some more questions: Let's say I am searching something at Google. ...
4
votes
2answers
134 views

Using SSL Certification in Multiple Locations

I have some issues with respect to using SSL Certificates. I have a website hosted in UK and I also have an organisation in South Africa hosting my company application online for web access. The ...
11
votes
1answer
156 views

How CA ensures that a certificate request is coming from me?

To establish trusted SSL connection I need to create a certificate request. For example, if I use openSSL I can do it by the following command: openssl req -new -key privkey.pem -out cert.csr ...
5
votes
1answer
202 views

Design of system based on HTTPS, Client Certificates and custom CA

I have the following system: 2 application servers. At the beginning is installed the first server and later is installed the second one. A client access from a browser to both servers Application ...
1
vote
2answers
627 views

Create a SSL certificate and sign it with a personal certificate which in turn is signed by a certificate authority [duplicate]

I have a personal certificate which is signed by a certificate authority. This certificate is unrestricted with respect to its allowed purposes. Is it possible to create a SSL server certificate on my ...
16
votes
3answers
3k views

What happens when an Intermediate CA is revoked?

Currently I'm working on a certificate manager that allows our product to securely connect to remote webservices (over TLS/SSL). For security, we use Certificate Revocation List checking (or ...
5
votes
1answer
417 views

'Trusted CA Certificates' and 'Trusted remote Certificates'

What is the difference between Trusted CA Certificates and Trusted remote Certificates?
5
votes
1answer
1k views

Use Client Certificate using Self Signed CA while using Web Certificate of a publicly trusted CA

I would like to ask if it is possible to use different CA for the client certificate and the web certificate? For example, I would use Verisign to sign my web certificate while I use my Self Sign ...
7
votes
1answer
219 views

Does dnssec protect against malicious registrars?

With the recent conspiracy theories around the registrar MarkMonitor Inc., the question arises, if DNSSEC protects against a registrar going malicious (or being attacked). This is especially ...
10
votes
1answer
486 views

Why can the validity of an SSL certificate exceed the registration period of a domain?

I can understand why one might desire to purchase a certificate for multiple years but I am left wondering why it appears to be possible to obtain a valid certificate for a domain that may have come ...
14
votes
3answers
256 views

Domain name expiration and TLS

If I purchase a domain name that has expired, do I have any assurance that the previous owner does not have a valid HTTPS certificate for the site? In other words, do CAs check domain name expiration ...
10
votes
5answers
6k views

A standard way to manually add a digital signature to a pdf file?

I've created a few certificates to use myself, but I find myself stumped when it comes to creating a certificate which contains a digital signature. First, how would I go about creating a standard ...
2
votes
1answer
2k views

How does an offline CA revoke certificates?

If an RSA private key of a root CA is stored offline, how does it revoke certificates it signs? From looking at OpenSSL config the default_crl_days option seems to indicate that a CRL must be ...
17
votes
1answer
18k views

Configure SSL Mutual (Two-way) Authentication

A lot of tutorials, a lot of pages, a lot of question and they differ in implementation of this issue "Configure SSL Mutual (Two-way) Authentication". I have to do it with Linux, and I don't know from ...
2
votes
1answer
283 views

Sending Digital Certificates

I used the makecert tool in order to create: a self-signed certificate a server certificate using the self-signed certificate a client certificate using the self-signed certificate I then ...
2
votes
1answer
414 views

Security Certificates - Tools to Generate Security Certificates

I want to create a self-signed certificate that will be installed as a trusted certificate authority. I then want to create another two certificates which are signed using the private key of the ...
1
vote
1answer
6k views

The request was aborted: Could not create SSL/TLS secure channel Exception

Let me explain my situation. I created a self-signed certificate and installed it in the Trusted Root Certification Authorities section in MMC. I then created two certificates using the self-signed ...
3
votes
1answer
2k views

Creation and deployment of self-signed certificates for a two-machine scenario

Let us assume that I have two computers: client server Now, in the server computer, I set up a legacy ASMX web service which will going to be used by the client. Before the client can connect to ...