A piece of data used in public key cryptography 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.

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3
votes
2answers
144 views

Is cacert.org more harmful than self-signing?

I don't understand the https security model attempted upon me by The OpenBSD Journal (undeadly.org). Instead of using self-signed certificates for https like they did in the past, they for a while ...
2
votes
0answers
21 views

How to find more details on Invalid Certificates [migrated]

Setup I am following this blog post to set up ASP.net MVC5 on Linux. When I get to the part that adds the Microsoft certificates, I am warned that they are invalid. For example, this command: ...
0
votes
0answers
9 views

What are alternate options for PBEWithMD5AndTripleDES with SecretKeyFactory.getInstance( ) for encrypting Image files? [on hold]

Are there any alternate options other than PBEWithMD5AndTripleDES. As we are aware MD5 is not considered secure enough a hashing method. My requirement is to implement Password Based Encryption (PBE) ...
4
votes
1answer
179 views

Did Google relax their SHA1 deprecation schedule?

In the original post on the subject they said that in Chrome 41: Sites with end-entity certificates that expire on or after 1 January 2017, and which include a SHA-1-based signature as part of the ...
8
votes
3answers
1k views

Why is my Positive SSL certificate deemed insecure by Google Chrome? [duplicate]

We run a website over HTTPS with a wildcard certificate from Positive SSL. Today, when I opened Google Chrome (v. 42.0.2311.90 m) and navigated to the site, I noticed a red cross through the https ...
1
vote
2answers
45 views

Website Certificate with different public key

I've installed a ssl certificate from https://www.startssl.com/ in a server running with plesk. The website is the following: https://refood.sal-pimenta.pt/ As you can see the certificate is fine but ...
3
votes
1answer
700 views

Is Google Chrome Extension access to SSL certificate validation output possible?

I want to develop an extension which will stop an user from proceeding to any banking site (configurable by user) if a proxy like paros is seating in between sending fake certificate to user. My ...
2
votes
1answer
92 views

Security Structure of an API

I've been developing a web application and APIs for 8 months. I implemented OAuth 2.0 client credentials for authentication. And now I have to implement TLS to my APIs. I've been dealing with SSL/TLS ...
-1
votes
0answers
34 views

Your connection is not private - delete certificate/security exception? [on hold]

I am trying to browse to a certain url and it gives me this error: "Your connection is not private" I understand I need an SSL certificate for that site. Well I got one for the site, but now I need ...
4
votes
1answer
54 views

Security risk: Digitally sign communications for SMB

I have a computer (Windows) on a network where an industrial process is controlled. There is an option in Local Security Policy >> Local Policies >> Security Options >> "Microsoft network client: ...
23
votes
6answers
3k views

Possibility to sniff HTTPS traffic on devices without installing a certificate

My goal is to sniff the HTTPS traffic of some digital devices (AppleTV, game consoles, etc.), and decrypt the HTTPS packets in my local network. I cannot figure out a way by using some HTTPS ...
0
votes
2answers
58 views

Is the lack of an IP address in the AN field of an SSL certificate a vulnerability?

When accessing a HTTPS site by IP address, if the IP address is not in the alternate names field, the browser will throw an error about the certificate not matching. Would this be considered a low ...
-2
votes
1answer
66 views

Fiddler Can decrypt https traffic

So apparently, a software called fiddler is able to very easily decrypt secure https traffic with a click of a few buttons: http://docs.telerik.com/fiddler/Configure-Fiddler/Tasks/DecryptHTTPS I ...
0
votes
1answer
75 views

How does driver install with an expired cert?

I'm working on making a silent installer of WinpkFilter driver. In my silent installation, I'm always getting a (not so silent) prompt that says "Windows can't verify the publisher of this driver ...
1
vote
1answer
101 views

Generating x509 PEM files for testing PEM parser

I need to test a parser of PEM formatted certificates. Thus, I need to generate many variations including variations that are invalid for various reasons. Obviously I can use openssl or a library like ...
1
vote
1answer
35 views

What bits of data is revoked in a CRL? Is it the hash(CSR) or hash(CSR + PKI signature)

My understanding is that a CSR contains the public key from the client, and the response is a signed version of that CSR, with certain attributes (EKU, expiration) and other attributes the CA decides ...
3
votes
1answer
129 views

A certificate site name mismatch when using preinstalled Toshiba software? (Superfish?)

On my Toshiba laptop there are a variety of different Toshiba programs that came pre-installed. Many of them are some sort of utility, optimizer, checkup, and update kind of programs that I guess are ...
1
vote
0answers
14 views

OpenSSL 0.9.8zc -> 0.9.8zd “broke” my certificates. [migrated]

I have a self-signed certificate (and CA) created on a Mac using OpenSSL 0.9.8zc. I use the certificate to secure connection to my svn server. With the latest OS X update, OpenSSL was updated to ...
-1
votes
1answer
24 views

Fido U2F Public keys in registration response

What is the deference between the two public keys: user public key (2nd element in Token response) user public key inside signature in U2F Token response for registration ?
2
votes
1answer
924 views

ADFS: Verify requests from relying party

In ADFS, serveral certificates are used. This is explained (very clearly) on this page: ...
6
votes
3answers
5k views

How is an X509 certificate signer verified?

Lets say I create a self-signed X509 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 ...
0
votes
0answers
22 views

SSL Handshakes and authentication? [duplicate]

I was just wondering if someone could explain the complete process of SSL handshake with certificates, public - private keys and MAC exchange. And in which cases does the Certificate warnings arise ...
1
vote
0answers
20 views

Outlook not updating certificate [migrated]

Outlook is refusing to send an encrypted email to a recipient whose certificate recently expired. The recipient sent a signed email and I exported the certificate to a ".cer" file then updated their ...
0
votes
0answers
7 views

openssl error: Error Loading extension section server [migrated]

The system is fc21. The objective is to run the examples: http://linuxconfig.org/apache-web-server-ssl-authentication The openssl.cnf file has been created and the following command run: openssl ...
0
votes
1answer
43 views

Can I use a CA certificate for two ways (mutual) authentication

I cannot get an answer from a CA company for this question. I have to implement two ways SSL authentication between my server and my users computers. Users should access to my several API securly. I ...
0
votes
2answers
1k views

How to test for OCSP?

I have to test OCSP feature on a SSL server. Since it is a pretty standard feature now, I was looking around for tips on test plans/setting up OCSP responder etc?
0
votes
0answers
45 views

Identify the attestation certificate (X.509) in Fido U2F registration response

I'm trying to identify the attestation certificate (X.509) in Fido U2F registration response as described in fido-u2f-raw-message-formats-v1.0-rd-20141008.pdf document: An attestation certificate ...
2
votes
1answer
103 views

HTTPS client certificates for server-to-server

Say you have two servers with certificates proving their domains (e.g. for use with HTTPS). Can one of these servers use their certificate as a client certificate when talking to the other, so that ...
1
vote
1answer
423 views

Forcing eap-TLS 1.2 authentication with FreeRadius and OpenSSL

Been working with TLS DHECE Certificate Based Handshake with a FreeRADIUS Server and wpa_supplicant- both running OpenSSL 1.0.1j FIPS. Afer watching the Wireshark traffic, I notice that the client ...
1
vote
0answers
21 views

TLS connection to untrusted server - client reaction for dropping connection standardized?

I played around with a man-in-the-middle proxy tool and connected different smart phones to it. As the proxy uses a self signed certificate the tested smartphone apps did not accept the presented ...
0
votes
1answer
51 views

How do I convert a GPG certificate to a CRT certificate that can be imported into Windows Certificate Manager?

I have a GPG certificate from someone used for email -----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG/MacGPG2 v2.0.14 (Darwin) I would like to import that into Windows Certificate Manager So ...
2
votes
1answer
2k views

What is the difference between a “Thumbprint Algorithm” “Signature Algorithm” and “Signature Hash Algorithm” for a certificates?

I'm a bit confused on the differences between Signature Algorithm, Signature Hash Algorithm, and Thumbprint Algorithm that are present in SSL/TLS certificates. Can someone please elaborate?
2
votes
1answer
42 views

Authenticity of PDF document printed from Word

My MS Word Add-In generates PDF preview of DOCX file on client PC and uploads both files to server. I cannot generate PDF on server. Is there any way to make sure that the PDF is the printed version ...
2
votes
2answers
226 views

haproxy with client certificate authentication signed by 'common' CA

Excuse me if I posted this here wrongly, I know the question is partly about haproxy itself. I am setting up haproxy as an SSL terminator/load balancer in front of an API that we need to expose over ...
0
votes
1answer
33 views

What exactly is meant by serverAuth and clientAuth

I'm building a network that will allow employees and customers to access the company systems. To that end I'm using a Linux 7 server as a firewall/authentication server. Initially for test purposes ...
0
votes
1answer
57 views

Storage on Root CA and intermediate CA certificate on Embedded device

Regarding the storing of Root CA certificates on an Embedded device Setup Explaination: 1. An embedded device which is a CLIENT on the network 2. There is a SERVER which connects to the CLIENT on ...
0
votes
2answers
85 views

What is the real use of certificates on the web?

When you get a certificate from a website you visit, signed by a trusted CA, is it trust-worthy because the CA authority did a background check on them? But how does this help with spoof websites? ...
455
votes
3answers
217k views

How does SSL/TLS work?

How does SSL work? I just realised we don't actually have a definitive answer here, and it's something worth covering. I'd like to see details in terms of: A high level description of the ...
1
vote
1answer
60 views

How to generate self-signed EV SSL Certificate?

I configured XAMPP / Windows on my laptop so that this URL: https://www.supersite.com/ points to XAMPP / localhost rather look elsewhere. I basically generated a self-signing certificate, imported ...
1
vote
0answers
18 views

Can I use a self-signed certificate in Tomcat for private APIs and a commercial certificate for public pages? [migrated]

I distribute a Java desktop application that needs to communicate with some RESTful APIs served by embedded Tomcat within a Spring Boot webapp. I was planning on using a self-signed certificate for ...
11
votes
2answers
650 views

Why does rfc6797 say “An HSTS Host MUST NOT include the STS header field in HTTP responses over non-secure transport.”

Why does the RFC prohibit the server from sending HSTS to the client over HTTP? I can see that if a HTTP client responds to that unsecure HTTP response it might cause that site to be inaccessible ...
1
vote
0answers
29 views

Does Activesync certificate authentication replace a password, or act as 2 factor?

I am looking at Activesync authentication and want to know if Certificate Authentication ignores a client username and password or Certificate Authentication requires a username and password ...
0
votes
0answers
19 views

Do I need my certificate server? [migrated]

Good afternoon. I'm getting ready to replace one of my DC's and noticed it is using the Certification Services role on it. I looked and we have about 8 outstanding certificates that have yet to ...
8
votes
6answers
592 views

Easy explanation of SSL client certificates for a developer

I've been thinking about using client certificates for my web apps, desperately hoping for security-conscious users to put their private key on HSMs so they don't get stolen even if the machine is ...
2
votes
3answers
773 views

Provide subjectAltName to openssl directly on command line

Is it possible to provide a subjectAltName-Extension to the openssl req module directly on the command line? I know it's possible via a openssl.cnf file but that's not really elegant for ...
79
votes
5answers
53k views

What is certificate pinning?

I'm superficially familiar with SSL and what certs do. Recently I saw some discussion on cert pinning but there wasn't a definition. A DDG search didn't turn up anything useful. What is certificate ...
8
votes
6answers
1k views

I see two different sets of certificates for Google websites when I am at work and when I am at home

I see two different sets of certificates for Google websites when I am at work and when I am at home. I mean if I save the certificates (in firefox, click on the "Google.com" block on the left of ...
5
votes
1answer
53 views

Do CA Public Audit Records increase the visibility, and risk of attack?

Does the CA feature of Public Audit Records increase the visibility of my hosts, and therefore the risk of host-specific attacks? Would the only mitigation be to only enable this for wildcard ...
1
vote
2answers
111 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
vote
1answer
38 views

Use appstore using trusted certificate [closed]

I connected my iPad to my laptop's localproxy. I also installed a trusted digital certificate in my iPad. I am now able to use all HTTPS networks through my iPad except appstore. If I disable proxy, I ...