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 ...

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21 views

Creating self-signed certificate for localhost and trusting fully

As an accompanyment to a web application we plan to have a node application running as a windows service running on the client computer. This will run a small web server which will listen on port XXXX ...
4
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2answers
51 views

Trusting the “subject” of an x509 certificate

A bit of background. Our organization is working on a document format that will be ingested by our software. We're using the CMS format to verify the integrity (by validating the signature). The CMS ...
1
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1answer
50 views

Letsencrypt not valid in Firefox or PHP, but valid in Chromium

I just moved one of my websites to https, using Letsencrypt. I am using Linux, and my Chromium correctly verifies website certificate, but Firefox shows it as invalid. I also have an API on the ...
28
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4answers
40k views

Expired SSL Certificate Implications

What are the security implications of an expired SSL certificate? For example if an SSL certificate from a trusted CA has expired will the communication channel continue to remain secure?
7
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4answers
5k views

Clarifying self-signed certificates vs root certificate authority

I hope someone can help me understand some fundamentals on SSL certificates that I've had trouble picking up from docs, Wikipedia, and just about everywhere else on the internet. I'm working on an ...
5
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1answer
64 views

Why are short-lived certificates so rare?

Let's encrypt recently left beta and limits the maximal life-time of certificates to 90 days and recommends 60 days. Now whenever I start talking about the issues of certificate revocation (e.g. OCSP ...
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3answers
200 views

what do you do when an ssl certificate expires and your app uses ssl pinning?

I originally posted this question on StackOverflow, but reposted here due to lack of responses. I am trying to decide if it's a good idea to do ssl pinning in my iOS game that uses a server to ...
3
votes
0answers
72 views

SSL certificate and price difference [closed]

After reading this discussion, Why are there very expensive and cheap SSL same type certificates? I surfed over the internet “Symantec Secure Site Pro with EV SSL Certificates”. I found something ...
15
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5answers
2k views

What is the difference between http and https with a self-signed SSL certificate?

A colleague of mine has told me he doesn't see why there is a warning when visiting a HTTPS website with a self-signed certificate saying that the security may be compromised, but there is no warning ...
4
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2answers
4k views

Windows Firewall Connection Security with Certificate

I've been fiddling with the Windows firewall configuration of some computers within a VMWare based LAN (no domain). To aid in my testing and debugging, I created a small, self-hosted console ...
1
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1answer
25 views

How is PKCS#10 and x509 related?

I'm unable to make sense of them using the RFCs. Can anyone help? When I use this function, http://www.pyopenssl.org/en/stable/api/crypto.html#x509req-objects , am I creating a PKCS#10 format CSR?
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1answer
44 views

How to determine effective trust chain for cert on MacOS X?

I'm seeing some curious issues with cert verification for an Issuer: Entrust - L1K cert that was issued and is in use (per inspection of the cert in Chrome and Firefox) for an internal site here. I ...
1
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0answers
27 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 ...
3
votes
1answer
22 views

SHA 1 no impact to root certificate

I ran a scan on a server and the results of the authentication for digital certificate was as follows : Certificate 1 (root) signature algorithm: Sha256withRSA Certificate 2 (chain of trust) ...
70
votes
4answers
27k views

Are all SSL Certificates equal?

After running a few tests from Qualsys' SSL Labs tool, I saw that there were quite significant rating differences between a GoDaddy and VeriSign certificate that I have tested against. Are all SSL ...
4
votes
2answers
34 views

What is the difference between Digital certification revocation and retiring?

Certificate management tools use options called revocation and retiring digital certificates.Can someone explain what is the difference between both?
1
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1answer
30 views

which the field represents digital signature value of CA in a certificate?

Normally CA signs the certificate with its private key and produces digital signature of it.The digital signature value will be displayed in certificate. My question is what is the field name that ...
0
votes
1answer
169 views

How does a Certificate Private Key get transferred on import / export?

I am fairly new to certificates in general and have setup my own standalone CA for testing purposes. I have noticed some interesting behavior of private keys which I'm trying to find some ...
0
votes
1answer
231 views

Creating root CA to issue certificates programatically

I have to generate a self signed root CA and use it to issue to certificates programatically. I am new to security and certificates and I think I am missing some pieces required to make the whole ...
1
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0answers
59 views

HTTPS: Same certificate, different public key

I have a web server, Debian, and the site uses a HTTPS cert from Thawte. The root certificate meant to be on top of my verification chain is also on the server, in /etc/ssl/certs, because the APT ...
3
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0answers
51 views

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 ...
14
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4answers
7k views

SSL root certificate optional?

I may have been under the wrong impression on how servers should be setup and what certificates actually get sent over during the server hello certificate message. I came across this today from ...
4
votes
2answers
83 views

Certificate Chain - intermediate and root certificate - installed required?

Recently I bought a SSL cert from comodo for my domain - orakoha.com After submitting the CSR etc, domain control verification etc, I am issued with a zip file containing 4 document which I believe ...
0
votes
0answers
13 views

Symantec/Verisign CA problem to install the intermediate certificate [migrated]

In order to sign/encrypt Email I have installed Verisign S-Mime Certificate from Verisign and exported it from IE as a .pfx (PKCS #12). My problem is when I tried to import it in Security > My ...
4
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2answers
71 views

Does client send request to CA when SSL handshaking?

In other words, if Certificate Authority goes down, does this mean that all HTTPS sites that purchased SSL certs from this CA will also become unavailable?
7
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1answer
13k views

SSL certificate chain verification

After reading many articles and watching many tutorials I decided to be specific because there are some things about SSL certificate chain verification and SSL cetificate verification in general that ...
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2answers
54 views

understanding client certificate - pfx on the general

Today I am given a pfx and told to access a website. I have absolutely no idea what was given to me initially, so please kindly confirm my understanding on a general level 1) the pfx is a container ...
1
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2answers
41 views

Subdomains on a multidomain EV SSL [closed]

I have a domain https://joshmurray.eu/ which has a Standard SSL certificate. I also have two subdomains: http://one.joshmurray.eu/ and http://two.joshmurray.eu/. I wish to upgrade my SSL certificate ...
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2answers
39 views

Files related/required to a digital certificate

I am new to digital certification and I am trying to understand it as well as get my domain certified. I know this question may be broad, but can someone give me a general idea of the usage of the ...
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vote
2answers
58 views

What are the steps to take after adding an invalid certificat authority?

in order to pay my bills online internet , I have to go through the website for my internet provider , type the login and password then I redirect to a page your connection is not private i proceed to ...
1
vote
0answers
25 views

After upgrading to Mac OS X 10.11.4, I start seeing reports that certificates are invalid [migrated]

I upgraded from Mac OS X 10.11.3 to 10.11.4 this week. After that, I found that, if I open some software e.g. Xcode simulator download page, or HMA client (a VPN Client), it reports some info: invalid ...
11
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3answers
31k views
1
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0answers
29 views

Approved Certificate Authorities for certification/compliance with HIPAA, PCI etc

Are there any requirements in PCI or HIPAA, or other security standards that may impact general government, payment processing, healthcare, that would disqualify any CA vendors that are trusted by the ...
3
votes
1answer
79 views

Is a CA obligated to issue a certificate for a proven legitimate request?

As hinted at in Does any technology prevent a CA unilaterally revoking a certificate?, I'm a little uncomfortable with the possibility that CAs effectively licensing a website to operate (given the de ...
0
votes
2answers
42 views

Local certification authority and certificate chain

I know that I can set up a local certification authority for a local network. I can issue certificates for all the devices in my network, and as long as they trust me, they can use such certificates ...
11
votes
2answers
767 views

Is using HTTP for OCSP a potential vulnerability? [duplicate]

While inspecting my CA-approved cert, I noticed the following oddities: Extensions/CRL Distribution Points: Not Critical URI: http://crl2.alphassl.com/gs/gsalphasha2g2.crl Extensions/Authority ...
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vote
2answers
117 views

What is the purpose of SSL Certificate Authority (CA)?

What is the purpose of an SSL Certificate Authority? How would a CA prevent dishonestcompany.com from doing something dishonest? What does the CA signing of the SSL/TLS cert for ...
0
votes
2answers
131 views

is Digital Signature vulnerable on the Internet?

We all know about how Digital Signing works. I just have some questions about vulnerability risk. At first, As I know, the Signature and the Data are separated and we can split the document into two ...
15
votes
6answers
2k views

What's the point of the CA?

So a Certificate Authority certifies that a website corresponds to a given organization. Why is this necessary? When I interact with a business or organization, I do it one of a couple ways: I ...
0
votes
1answer
73 views

Are Free SSL/TLS Certificates Trustworthy ? Can Cert Providers Snoop On Traffic? [duplicate]

I know nothing about encryption, SSL, TLS, certificates and have come across several companies offering free SSL/TLS certificates. How trustworthy are these offers? Why would I want to adopt this ...
3
votes
1answer
43 views

SSL negotiating too low a protocol?

I'm trying to diagnose a potential SSL/TLS problem between a Mac client and a Windows server. I have generated my own root cert and signed a cert for the server, and installed the root cert on the ...
14
votes
1answer
361 views

Yubikey / GPG with OpenSSH signed key

I am currently looking into the possibility of using Yubikey (NEO)'s to store the private SSH keys of my users. By searching the internet I've found several places that explain how you can generate a ...
4
votes
2answers
86 views

Good way to obtain an EV SSL certificate for personal use? [closed]

I would like to obtain some sort of digital certificate for personal use. I would like to use this for encrypting and signing e-mails, digitally signing contracts, and for providing authentication of ...
11
votes
2answers
815 views

How long can X.509 certificate chains be?

Usually, I only see certificate chains with a root CA, an intermediate one, and a third one for the particular SSL/TLS website; but can X.509 certificate chains be deeper than 3 levels? Is there a ...
3
votes
2answers
117 views

Can a CN-only certificate bypass a name constraint if the CA goes rogue?

I am trying to cross-certify an internal issuer certificate, adding a name constraint for our domain. However, it seems that an attacker could bypass this protection by putting the desired host name ...
3
votes
1answer
163 views

Is it possible to trick a CA into signing a certificate by intercepting on SSL domain validation email?

From my understanding domain validation certificate are verified by receiving an email on some special email addresses on the domain (e.g. postmaster@example.com, admin@example.com) or by sending on ...
1
vote
0answers
88 views

MQTT (Mosquitto) certificate SSL23_GET_CLIENT_HELLO:unknown protocol [closed]

I'm been desperately trying to get my MQTT clients to connect to my MQTT broker which is set up with a certificate from a CA. To be able to get the CA certificate, I've used the letsencrypt python ...
4
votes
1answer
898 views

OCSP: What is “hackedirl.files.wordpress.com”?

After I ticked that my browser (Firefox) must require OCSP: I got a window pop up (several times! And it still pops up.. ~randomly ~about a few 10 minutes): http://i.stack.imgur.com/NYdoe.png I ...
0
votes
0answers
70 views

When connection is slow, all sites provide certificate for same domain name

My home connection is sometimes very slow - or non-existent at all. I have not found the cause of the problem yet. Generally, rebooting the router works. Sometimes, when the connection becomes slow, ...
0
votes
2answers
85 views

How In-House Certificate Authority works (e.g. EJBCA)

I have a simple (dumb?) question with respect to EJBCA. I have been exploring how In-house CAs work and issue certificates. However, I am not able to understand who will be trusted on the top level in ...