Certificate authorities verify the owner information of certificates by signing them.

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31 views

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 ...
2
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3answers
69 views

“Web of trust” for self-signed SSL certificates?

SSL certificates, generally speaking, use a "chain of trust" model - a trusted certificate authority (CA) gets proof that a company such as Amazon owns amazon.com and issues an SSL certificate. ...
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1answer
218 views

unexpected thumbprint when connecting via remote desktop - what now?

I have an Amazon EC2 instance in a VPC. I have not logged into it for some time, so I used the Amazon EC2 CLI with ec2-get-console-output to check what the thumbprint should be when I connect. To my ...
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1answer
53 views

Is there any mechanism to audit which signed certificates are unrevoked?

We are currently using EasyRSA and OpenSSL to manage our user VPN certificates for OpenVPN. The process we have in place currently is: User generates a CSR on their laptop and sends it to us to sign ...
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12answers
4k views

How feasible is it for a CA to be hacked? Which default trusted root certificates should I remove?

This question has been revised & clarified significantly since the original version. If we look at each trusted certificate in my Trusted Root store, how much should I trust them? What factors ...
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2answers
52 views

What's the mitigation strategy for when a CA's private key is stolen?

I'm new to SSL/TSL and was wondering if you could walk me through the following scenario. Scenario Let's say I am one of a thousand websites that has a certificate signed by some certificate ...
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2answers
5k views

Internal SSL Certificates?

As a developer I really like the idea of using OpenSSL to get perfectly good, free, SSL certs. Unfortunately, from all the research/analysis I've done so far, it doesn't look like there is any way to ...
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1answer
119 views

automatic connection from LSASS to different IPs. Is this the usual behavior?

I'm using windows 7. firefox 22. connecting through a regular residential wifi router. In the last month I've noticed that when I connect to the internet and once in a while my firewall indicates me ...
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3answers
3k views

How is an X509 certificate signer verified?

Lets say I create a self-signed certificate A and use it to issue certificate B. I put certificate A in my trusted root authorities so that all certificates signed by it are accepted. My question is, ...
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2answers
30 views

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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1answer
49 views

What crypto prevents & detects “invisible” CAs? (e.g. in X509v4)

For this question, I'm calling an "invisible CA" one that Is signed by a root ca and exists as a 2nd or 3rd tier Is valid, not expired or revoked Has a different Public key than one that is ...
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3answers
138 views

From a trust perspective, is renewing a CA certificate the same as trusting a sub-CA?

I'm trying to understand the validation logic that would occur in the following hypothetical scenario An unpatched XP user who trusts a list of root CAs. Those CAs in particular have been renewed ...
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1answer
37 views

Are “Certificate Templates” used only as a “Template” or do they validate a certificate request?

I'm trying to learn how Microsoft Certificate Templates interact with a certificate request, and can only guess that they take on one of the two/three forms: They simply help the client create a ...
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4answers
2k views

What web browsers support OCSP stapling? Are the privacy and performance features the same?

OCSP stapling decreases the load on a PKI infrastructure's OCSP server by attaching a signed OCSP response to the target in a TLS connection. In addition it creates a more secure/private session ...
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0answers
35 views

Generate a public key certificate signed by CA with OpenSSL [migrated]

I am working on a webservice that requires a signature in the sent and received messages. After sending a certificate request to the entity that will consume the webservice, they sent me (in addition ...
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2answers
83 views

Isn't this the same as using a certification authority?

Taken from Wikipedia, here is the pretext to my question: A certificate authority (CA) is an organization that stores public keys and their owners and every party in a communication trusts this ...
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1answer
26 views

Temporarily suspending a Certificate Authority's Certiticate

The PKI RFC talks about revoking or suspending certificates. It also talks about revoking CA certs. However, I could not find anything about whether a CA or a Sub CA's certificates can be revoked or ...
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1answer
78 views

How do I get a third-party-signed ssl client certificate?

I've been given a requirement of providing a client certificate to authenticate between two application's web services. The other application (that I don't host) is requiring an SSL client certificate ...
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5answers
2k views

Are self-signed certificates actually more secure than CA signed certificates now?

Are self-signed certificates actually more secure than CA signed certificates now? I ask this because recent leaks about the NSA spy programs and the secret FISA courts mean that the US government ...
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4answers
256 views

Why self-signed https is less trustworthy than unencrypted http?

It wouldn't be far-fetched to guesstimate that at least 50% of the web traffic can be intercepted in 2014. However, a guesstimate of active interception attacks is likely an order of magnitude ...
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1answer
33 views

How to Delete duplicates in CA Bundle Certificate File

I do have a big CA bundle certificate file and each time if i get request to add new certificate to the existing bundle i need to make sure it is not present already. How i can validate the ...
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1answer
45 views

Can two parties sign each other's certificate and exchange without CA?

Is possible (and practical) for two users to create their own self-signed SSL certificates, exchange these certificates (perhaps in a face-to-face meeting), and then communicate with each other ...
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1answer
568 views

Android Kitkat reports: “Network May Be Monitored by an Unknown Third Party” when using non-default root CA

My company uses a private PKI to handle such scenarios such as Mutual auth (TLS) to a website using client certificates SSL web server certificates on an Intranet (once a VPN session is ...
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1answer
51 views

what harm can a malicious ca do?

If ca's act in the interests of an eavesdropper, what is the worst they cold do? I guess they can decrypt traffic not using perfect forward secrecy and impersonate the server. Is this the case?
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2answers
60 views

Public e-mail Encryption Certificate

I'm quite new to this, so don't be too hard on me. I'm currently using the CipherMail MTA to generate e-mail encryption certificates. I created an own CA and public and private keys for our contact ...
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9answers
10k views

Is there any technical security reason not to buy the cheapest SSL certificate you can find?

While shopping for a basic SSL cert for my blog, I found that many of the more well known Certificat Authorities have an entry-level certificate (with less stringent validation of the purchaser's ...
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0answers
15 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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3answers
8k views

Checklist on building an Offline Root & Intermediate Certificate Authority (CA)

Microsoft allows a CA to use Cryptography Next Generation (CNG) and advises of incompatibility issues for clients that do not support this suite. Here is an image of the default cryptography settings ...
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3answers
55 views

Are Extended Validation certificates any more secure than regular ones?

Or are they just an attempt to get you to pay more money to a CA because it tells your browser to show the address bar in green with your organization's name? Also, what are the technical details ...
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2answers
30 views

Is there a website or other resource that lists operating systems/platforms and the included root certificates?

I need to choose a certification authority (CA), to get a certificate, but I noticed that there are several of these only present in some operating systems/platforms like windows. I need to choose one ...
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1answer
32 views

Is it possible to create a SMIME only PKI that *can't* be used for SSL?

Assume I have a Root CA that I want to share with hostile untrusted 3rd parties. Then constrain this root using specific EKUs at the root. OID=1.3.6.1.5.5.7.3.4 ; Secure Email Next, ...
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2answers
59 views

Authentication through digital certificates plus signature

While studying X.509 certificates, I've found that authentication is safer if I associate/combine one or more certificates with each signed message (certificate + signed message). The receiver of ...
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3answers
77 views

How are public key certificates updated securely?

Let's say I get a new computer that's never been connected to the internet before. The first time I connect it to the internet, is it susceptible to a mitm attack while downloading its public key ...
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2answers
11k views

Error code: sec_error_untrusted_issuer

I need help with a security issue concerning this code that has just been popping up recently as I visit my favorite websites. Based on some past history I KNOW something is not right, and I am not ...
2
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1answer
173 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 ...
2
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2answers
81 views

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 ...
2
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1answer
96 views

Why does facebook php sdk (and multiple others clients) include CA bundle with a lot of CAs?

This is what facebook ships with their API php client: https://github.com/facebook/facebook-php-sdk-v4/blob/master/src/Facebook/fb_ca_chain_bundle.crt It contains dozens (hundreds?) Root CAs. But ...
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7answers
966 views

Which forensic techniques should I use to identify intrusion or monitoring of my computer or cellphone

If I suspect my computer or cellphone is being monitored by an unknown attacker, what tools or techniques could I use to detect or identify such monitoring?
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3answers
306 views

How can I get my SSL certificate signed by an CA for web application that runs on localhost

I have a web application that runs on localhost. I have a self-signed certificate for tomcat configured but when loading the website on firefox, I get a security exception. Can I get a CA to sign my ...
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1answer
62 views

Are there other ways for a CA to have their certificates included in a browser?

From what I understand, the certificate authorities (CAs) have to get their root certificate included in the browser. What if the root certificate of a particular CA is not included in the web ...
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3answers
215 views

Limiting the root certificate chain

I'm playing around with the idea of running a mini-CA with my (hobby) website, likely only used internally with a few select developers for internal emails, client authentication, staging/development ...
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7answers
3k views

Does it matter which Certificate Authority I source my SSL Certificate from?

To secure my web site with HTTPS, does it matter which company I source my SSL certificate from, or just that the browser recognizes it? From the Area51 proposal.
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0answers
33 views

How to gather/verify certificate data with limited information (Issuer, Serial, CN)

I asked this question in the "programming" section, Here. However it may be a simple answer for someone familiar with the security of certificates. The basic premise is I have a large table with ...
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1answer
119 views

What is the advantage of buying an SSL certificate from the CA rather than a reseller?

I am trying to do some research on SSL certificates, and I've come across a number of reseller sites such as GoGetSSL, which offer certificates at much lower prices than what you would pay if you ...
0
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4answers
104 views

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 ...
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0answers
35 views

MS Certificate Services, SCEP and Domain Credentials

I'm reading about Simple Certificate Enrollment Protocol (SCEP)2 vulnerabilities from CSS's The Use of the Simple Certificate Enrollment Protocol (SCEP) and Untrusted Devices. The paper discusses a ...
3
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1answer
41 views

Windows - service account default certificate store

I am writing a web app that connects to external web services. The external web services serve an intermediate certificate signed by Thawte SGC CA - G2. When I setup IIS to run the web app using ...
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0answers
31 views

Changing the string format of Burp generated certificates

The certificate verification in a piece of software I'm poking uses UTF-8 encoded strings to verify the certificate's host name. Certificates generated by Burp suite, however, use the custom type ...
3
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1answer
391 views

How to go about an ssl certificate renewal

I've got an ssl certificate from godaddy, and it's time to renew. I ended up with a single "keystore" file, which I give to my webserver (jetty). This is the process I went through to generate the ...
0
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1answer
162 views

How to become an internationally recognized certificate authority (CA)?

What's the procedure a certificate authority (CA) must follow to get internationally recognized, like Verisign or GlobalSign?