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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2
votes
2answers
142 views

What is the exact problem if a website has an SHA-1 certificate?

There was a recent question about trusting (or not) a website showing an SHA-1 certificate. I would like to know whether I understand the actual issue correctly. The dangers are (a) that someone ...
1
vote
2answers
51 views

Strange CA certificate prompt

My network went down for a minute today, then this window popped up: Can someone here clarify this for me? I was using firefox. I had google, youtube and outlook open. My name isn't even close to ...
4
votes
1answer
55 views

TLS/SSL Certificate - Key usage and encryption

So I'm looking at google.com's SSL certificate and do not understand a few things: I totally get that it ensures the identity of Google's webserver, but don't understand how it proves anything ...
28
votes
4answers
4k views

Should I trust a website which uses a HTTPS certificate using SHA-1

I am on a website where I need to pay for something. This website has the following warning in the top left: This site uses a weak security configuration (SHA-1 signatures) so your connection ...
0
votes
1answer
20 views

Use externally generated CA cert to sign CSR's in OpenSSL

I wondering if it is at all possible to use an externally generated root CA ( and by external I mean an internal root CA that was created using another tool) and use it with OpenSSL to sign a CSR? ...
-3
votes
0answers
44 views

How do I find out what CA credentials certificates are OK to disable? [on hold]

I need help with figuring what is OK to disable on my certificate's and what does Hong Kong really need to be there for?
1
vote
1answer
34 views

Password manager login with compromised certificates

This morning I booted my work laptop as usual and logged in to Windows, then my password manager (Dashlane, if it makes a difference) as usual. Opening up Chrome and browsing to a site with HTTPS ...
2
votes
1answer
52 views

Can a DNS “route” change cause an SSL certificate error?

What I mean by "route change": As a working example, mysite.example.net is set up as: mysite.example.net. 3600 IN CNAME some-other-site.elsewhere.com. ...
0
votes
0answers
18 views

Certificate not showing up for signing in Outlook

I have a new ECA certificate installed on my Windows 7 machine, but when I use Outlook it is not letting me change the signing certificate to the new certificate, but it does let me change the ...
2
votes
2answers
39 views

How do I handle HTTPS certificates for a device with dynamic IP?

I'm fairly new to HTTPS and therefore risk this being a dumb question. I have a server hosted on my Raspberry Pi that allows me to configure it remotely, over a network and I'd like to convert to ...
0
votes
0answers
17 views

How can I use unique PKI from host to client [on hold]

I have hundreds of machines i would like to have unique credentials/certs on. I also have a even more cell phones i need to run diagnostics on the machines. Is there a way i can do this? I will also ...
0
votes
2answers
39 views

What is the purpose/role of the “alias” attribute in Java keystore files?

I've heard conflicting information about the purpose of the alias attribute in Java keystore files. Can someone please clarify on what exactly this attribute is, and what it should be set to when ...
0
votes
0answers
27 views

Validate Code Signing Root Certificate Offline

I am developing a library distributed as a Windows DLL to be called by 3rd party executables. I expect the calling EXE to be digitally signed and need to verify that. I have no control over the ...
0
votes
0answers
28 views

Web service authorization to specific applications: certificates, embedded secret or both?

My needs are somehow similar to this answer, but I would to be more specific. I have a set of web applications (A and B) that access to a REST service (R). A, B and R could be on the same server or ...
2
votes
1answer
31 views

Can the server detect when a client has disabled certificate pinning?

Many mobile applications enforce certificate pinning in order to make a man-in-the-middle attack difficult to accomplish. However, with a jailbroken/rooted device, it's possible to disable the ...
1
vote
1answer
82 views

Standard for securing web server to client connections via HTTPS on the local area network

I am trying to set up some kind of secure client to web server connection that takes place entirely on local area networks, but I'm having trouble understanding what the recommended best practice is. ...
0
votes
0answers
4 views

How to enable IE 10 to accept sha-1 ssl certificate? [migrated]

I have a server certificate issued by a CA that uses sha-1. Chrome (latest) allowed me to access a server that imports the server cert but IE 10 didn't. Is there way that I could configure IE 10 to ...
-1
votes
1answer
24 views

SIM card used with smart card user certificate

Is it possible to put a smart card user certificate (Windows) on a SIM card? (SIM card already has telecom info on it). I'm using Win 2012 and have tried, but I am getting this error "smart card ...
1
vote
1answer
32 views

Multi-User-Server Public-Key-Based Authentication

So, lets say we have Alice, John, Peter and Bob. Alice, John and Bob all know Peter's public key and trust Peter. Alice wants to connect to Bob's server, so she presents her public key, which was ...
4
votes
1answer
54 views

Why is the SHA-1 hash of certificate sent in TLS “Client Certificate URL” extension?

According to RFC6066, constrained clients can send certificate URLs instead of full certificates for TLS client authentication: After negotiation of the use of client certificate URLs has been ...
0
votes
2answers
42 views

What if internal certificate details like CN, Serial Number, validity, CA etc. are shared to external parties from my intranet site?

If by mistake I have shared the details like Common Name, Serial number, etc.. of the certificate of my intranet site/server that is not exposed to the internet will it help attackers exploit the ...
6
votes
2answers
168 views

Why are certificate chains different in Firefox and Chrome?

I have a server with HTTPS, and I noticed a very strange behavior which I cannot understand. When I checked the chain in Firefox, there is this: But in Chrome I see this: So it's clear, that ...
1
vote
1answer
51 views

LetsEncrypt / Exim4 / GnuTLS / cert chaining: “The provided X.509 certificate list is not sorted” error

From what I can determine, you generate a LetsEncrypt certificate that includes the full cert chain thus: # run lets-enc the usual way # then ..: wget -O intermediate.pem ...
0
votes
0answers
5 views

Invalid certificate problem with Outlook meeting [migrated]

I have a legacy meeting in Outlook, and every week when it occurs I get this popup: I have tried to "change the security settings" and it has no effect. How can I fix this?
1
vote
1answer
43 views

How can I list all self-signed certificates in my stores on a Windows client?

I'm on a mission to list the self-signed certificates ('issued by' and 'issued to' match) on my machine via an automated method. PowerShell is available for use. Preferably the results would be ...
1
vote
1answer
82 views

Is or was it possible to register a wildcard certificate to third level subdomain?

The use of a null byte in a certificate cn is very well known… and I saw this code in a popular smtp server (who obviously thought it didn’t worth to use the gnutls or openssl for doing that kind of ...
5
votes
2answers
93 views

How could mobile developers prevent bypassing certificate pinning with tools such as SSL Kill Switch?

I used SSL Kill Switch on some iOS mobile applications to try to bypass certificate pinning and I was successful. I understand that SSL Kill Switch "kills" the certificate validation process on the ...
1
vote
1answer
124 views

Is using “SHA-256 with RSA-2048 Encryption” a secure certificate hashing algorithm?

Is using "SHA-256 with RSA-2048 Encryption" a secure certificate hashing algorithm? I don't think it is. Two examples: nsa.gov [careers site] give.wfp.org
2
votes
0answers
44 views

Why more Android applications (compared to iOS) use certificate pinning? [closed]

I used mitmproxy to test the same 50 apps on iOS and Android and noticed that more than 50% of the Android applications compared to 23% of iOS, used certificate pinning. Is there any explanation as ...
0
votes
0answers
24 views

Securing several Servers (Certificates)

I got a Question regarding Certificates. We got a situation, where only "Server 4" and its clients are given in the picture above. That Server4 (SLES11) and its Clients are using a self signed ...
0
votes
1answer
85 views

How to verify the signature value in a SSL certificate?

According to RFC 3280 a certificate's basic syntax is Sequence := { tbsCertificate signatureAlgorithm signatureValue } In tbsCertificate, SubjectPublicKey is the public key of the ...
0
votes
1answer
46 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 ...
2
votes
0answers
38 views

How to enable self signed certificates in Windows 10?

I want to use a Yubikey 4 with Windows 10 Pro for Bitlocker and login with my TPM. Unfortunately, I found out I need to enable self signed certificates and all the guides on the Internet I found were ...
1
vote
0answers
15 views

How did I get a signed cert back with a wildcard common name when I submitted a csr with a specific common name? [duplicate]

Apologies if this is obvious but I'm hoping for some clarification here. I generated a CSR on an appliance of mine. This CSR had a specific common name (let's call it foo.domain.com). I then sent ...
-1
votes
1answer
46 views

Same certificate but different private keys on different servers. Does this work?

We have a SAN cert that is used on multiple servers. Is it possible to have the cert re-keyed and only use the new private key on a particular server while keeping all of our other servers using the ...
4
votes
2answers
65 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 ...
3
votes
2answers
81 views

Best practices to implement HTTPS in embedded devices

Embedded devices, such as routers, IP cameras, generally provide HTTPS access to the admin interface. These HTTPS implementations generally have a lot of problems (non-unique certificates, self-signed ...
0
votes
3answers
58 views

Same wildcard cert from two different 3rd party CA's

We have a wildcard cert that's due to expire in three months. The CA won't let us renew it until one month prior to its expiration. We're thinking about using a different CA since we've since ...
5
votes
3answers
138 views

X509 CRL suspended certificates and openssl ca comand

In CRL X509 format we have "Hold Instruction code" for a list of suspended certificates. I know that "its use is strongly deprecated for the Internet PKI", but in my own private CA, I want to use it. ...
0
votes
1answer
31 views

How secure is it to bundle unencrypted private key and a CSR into PKCS12 certificate?

I want to create a self-signed certificate to digitally sign my documents. I want to do so using my existing key pair, but to accomplish this I'd have to export my private key unencrypted into a file, ...
0
votes
1answer
68 views

Securing Internal Mobile REST API

I am planning to create an internal API for mobile devices for a company. They are planning to use this internal mobile app to get data from custom ERP, uploading contract, etc. Thus, it will be ...
1
vote
5answers
92 views

Best Option for SSL Certificate for 2 Domains + All Subdomains

I am hosting multiple websites on my Mac Mini server (latest version). For some reason OS X server does not support multiple SSL certificates well for websites, and after hours on the phone with ...
1
vote
1answer
44 views

Securely opening an insecure webserver to a single phone

I have a webserver running inside my private network and not exposed to the internet. I'd like to securely talk to this webserver from my mobile phone over the internet. However, this webserver has ...
0
votes
0answers
17 views

Does the AppId matter when self signing a cert?

We are going to start using self-signed certificates on our dev server. I went through some step-by-step instructions on how to generate the cert and set up ssl with my service. To add the cert, I ran ...
3
votes
1answer
179 views

Benefits of a wildcard vs per-subdomain certificates

As you might know, Let's Encrypt doesn't offer wildcard certificates and it won't in a short-term because you can just order as many certificates as you want for the sub-domains. This make me ...
5
votes
1answer
77 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 ...
1
vote
1answer
101 views

Digitally signing a document with your public/private keypair without certificates?

I have generated a private/public key pair using gpg. Can I use this key pair to digitally sign a PDF without a digital certificate, but to still have the signature integrated into the PDF, instead ...
1
vote
3answers
134 views

What SSL certificate do I need?

I have 2 domains, one where the website is hosted (lets call it www.a.com), and another (lets call it www.b.com) which has a CNAME record pointing to the first one (www.a.com). Which one should have a ...
3
votes
0answers
79 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 ...
2
votes
2answers
68 views

What advantage would someone gain by installing my root certificate?

The answer to this is probably simple, but it eludes me. Here's the scenario: At the moment, I have a server with a certificate issued to it using HTTPS that a customer POSTs responses to after ...