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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35 views

For X.509 Certificates where is the actual digital signature?

When you open up the certificate information from your browser and go to the details tab there is a bunch of information for various certificate fields. I am wondering which field contains the actual ...
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2answers
79 views

wordpress server certificate does not match url

When visiting a WordPress blog using HTTPS Chrome gives me a warning that the domain on the certificate (*.wordpress.com) does not match the URL (someguysblog.com). This seems to be a known issue. So ...
6
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1answer
73 views

Is there any benefit in having CNNIC certificates installed, if you're not in China?

All modern browsers/OS come with root certificates from the China Internet Network Information Center. AFAIK these certificates are required for computers sitting behind the Great Firewall to function ...
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1answer
92 views

How to determine which Browser Certs to reenable on a per-case basis?

Considering that there is no way to actually see which certs that I use in my regularly-visited websites, I've decided to disable all certs and re-enable them on a case by case basis. This is for the ...
0
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1answer
63 views

What is the purpose of a man in the middle certificate?

So I'm at work today and I'm having all kinds of issues getting into secure sites that I need to do my job. So I go to portal.azure.com and I find out that the certificate for the site isn't issued by ...
3
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2answers
57 views

Rerouting domains and the need for multiple SSL certificates

If a domain URL is registered with a .com (www.example.com) and we would like to re-route to this domain from a second domain name with a .com.tr (www.example.com.tr), is this possible? The .com ...
3
votes
2answers
144 views

What's the difference between Comodo Premium and Positive SSL certificates [duplicate]

I'm just about to buy a SSL certificate from Comodo, I've doing a research in many CAs, many of them have this kinda premium certificate, and another like positiveSSL, rapidSSL, and instantSSL. The ...
42
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7answers
5k views

Is there any legitimate reason to install yourself as a root CA?

Follow up from comments on another question. Is there any reason as to why you might install yourself as a root CA on your own network? The only reason I can think of is forcing computers in the ...
30
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4answers
5k views

Corporate computers have own corporation's cert as trusted CA; should I consider all traffic compromised?

By my admittedly limited understanding of how HTTPS/TLS works, the end user (me) initiates a connection with a remote server which signs every one of its messages with a public key. This public key ...
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0answers
48 views

deceptive digital signature?

I am new to cyphering and I try to understand this case : my government sends me so-called "digitally signed" PDFs, as you can see below (text only, after "Thanks"). Although there is a certificate ...
1
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1answer
51 views

SSL/TLS certificates that only certain users can use to talk to my server

are there something like SSL/TLS certificates or other equivalents which could allow only certain trusted users (from the internet) who have my server credentials in their browser to access my web ...
2
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1answer
106 views

Should we trust online banks with our credit card information?

I'm thinking of buying a product for someone using the steam platform. Being in Germany, the best (least expensive) option would be to use a local bank. Logging in, choosing a product and checking out ...
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2answers
157 views

Generate CSR and private key with password with OpenSSL

I am using the following command in order to generate a CSR together with a private key by using OpenSSL: openssl req -new -subj "/CN=sample.myhost.com" -out newcsr.csr -nodes -sha512 -newkey ...
2
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0answers
47 views

Windows IIS Event/Security Log ID of Private Key deletion of corresponding TLS certificate?

I'm in the middle of writing an MS Active Directory Certificate Services Key Management Lifecycle document for my organization. The primary purpose certificates will serve for this organization is to ...
2
votes
3answers
136 views

Why include a private key in a root certificate?

In the recent Dell root certificate issue (see https://threatpost.com/dell-computers-ship-with-root-cert-private-key/115455/), the private key was included with the certificate. This is baffling to ...
2
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1answer
769 views

OpenSSL check if a SSL certificate is SHA-1 or SHA256 signed

How do I check if an OpenSSL certificate issued to a site is SHA-1 or SHA-256? I have a quite a lot of intranet sites using OpenSSL certificates and I am a bit confused as when I check the certificate ...
3
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1answer
241 views

Check root certificates and certificate authorities on new PC

First Lenovo was caught shipping Superfish with new PCs, which included a universal self-signed certificate authority, and now Dell has been caught shipping PCs with a similar root certificate. What ...
8
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1answer
133 views

How can I protect myself against software installing insecure root certificates?

With the recent news that Dell installed a root certificate with a publicly accessible private key on their notebooks, I'm wondering how I can protect myself against this kind of incompetence. Of ...
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2answers
624 views

Alternatives to HTML's deprecated <keygen> for client certs?

The keygen tag is used to make browsers generate private keys and POST the resulting CSR to the server, which can then issue a certificate. It's now been deprecated, for rather stupid reasons but ...
16
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4answers
2k views

Broken SSL on every website [duplicate]

One of my friends called me saying every website anyone in her family goes to has untrusted SSL certificates. From any computer in her house, HTTPS is broken and Firefox or Chrome asks to add an ...
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1answer
72 views

Is it safe to publish my development private key?

For my development environment, the following three SSL files allow me to access my application from https://localhost on my local machine. Private key: server.key Certificate signing request: ...
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2answers
73 views

Generating a Certificate Signing Request for an Apache webserver on a sub domain?

I'm reading the instructions for generating a CSR, and it reads that: "Replace yourdomain with the domain name you're securing. For example, if your domain name is coolexample.com, you would ...
13
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2answers
2k views

Are SHA-2 certificates considered obsolete, or current?

A guide on this site on how to make a decent Certificate Signing Request (CSR) says that I should be using SHA-2 certificates to secure a HTTPS webserver. Are SHA-2 certificates considered obsolete, ...
0
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3answers
87 views

Hostname validation for server-side certificate

I have a reverse proxy which connects to an application which presents a certificate used for PKI based validation. I was wondering if I should enforce the condition that the common name (or ...
0
votes
2answers
90 views

How to know when to install a certificate?

How do you actually know when a certificate is issued that your system doesn't recognize, whether to trust it or not? When I was setting up Outlook for Gmail I got prompted to install the following ...
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1answer
44 views

Find the Encryption Key (used for network encryption) assuming a Trust Chain is being used on Windows?

If I double click on a .crt file, in Windows, I'm presented with three tabs General, Details, and Certification Path. I'm aware that the Certification Path tells you the details of which root and ...
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1answer
37 views

Signed E-Mail certificate invalid [closed]

I sent a valid signed e mail a few weeks ago. Now I reinstalled everything on my computer (including the OS). Is the certificate now invalid?
2
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2answers
416 views

OpenSSL - Generate self signed certificates with different cipher suites

I want to generate a root certificate and SSL certificate (self-signed) for communication between an embedded device and our backend servers (IIS 8.0). I used OpenSSL to generate a certificate with ...
1
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1answer
100 views

What Are Good Code Signing Environment Guidelines? [closed]

Take this scenario as an example: An organization has a few build servers that periodically check out source from a repository and builds everything. When a build finishes the binaries are code signed ...
0
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2answers
71 views

Does X.509 standard claim to check client certificate's expiration date on server side?

Does the X.509 standard claim to check client certificate's expiration date on server side? Consider an expired client certificate in the trust store of web server. If some client tries to ...
8
votes
2answers
617 views

Did scammers take control of a subdomain to host phishing site?

This morning I received a text message (ostensibly) from my bank: We need to contact you. Please visit https://paymentassistance.nationwide.co.uk for more information My spidey sense immediately ...
1
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1answer
64 views

Self created CA root for client certificates [duplicate]

My company wants to use client certificates for clients on production. We have a HTTPS certificate. As I understand we need a CA root certificate to create client certificates. Question: is it OK if I ...
6
votes
1answer
213 views

How do Lync and SSL inspection play together?

Whitelisting all Lync hostnames is cumbersome. Globally deactivating SSL inspection is undesirable. At a place I work for, they have SSL-inspection enabled on their proxy. All traffic to the Internet ...
6
votes
2answers
552 views

Could a stolen certificate show as trusted?

I have recently started learning about PKI and have the following question/s. As far as I know a signed certificate contains the domain name of the server that the certificate will be placed upon. ...
3
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1answer
49 views

Connection not secure when using a proxy

I connect to the Internet using a proxy at my university residence and I noticed at some sites (like my bank and PayPal), the browser reports that: it's unable to check if the website certificate ...
1
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1answer
249 views

Client authentication successful when using a pfx with Java, fails using OpenSSL. Why?

I've been trying to troubleshoot issues with client authentication and am seeing different behaviour when connecting from a Java application vs OpenSSL. A third party has provided me with a pfx, I've ...
6
votes
2answers
148 views

How can I verify that a root certificate is authentic?

I have found that my home PC (Windows 10) currently has 39 root certificates installed. While scrolling though the list I have noticed: Names that look familiar (e.g. Thawte / VeriSign) Names ...
9
votes
3answers
846 views

Do client certificates need to be trusted by the client?

I'm looking for some clarification around the trust requirements (if any) of client certificates. I'm working with a third party to access their services via Mutual TLS. I generate a CSR, send it ...
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1answer
54 views

Do certificates need to be protected at rest? [closed]

I have downloaded numerous certificates to my device. How do I ensure the confidentiality and integrity of the data at rest?
3
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1answer
119 views

Are the elliptical curves in ECDHE and ECDSA the same?

ECDHE is quite widely used and recommend. And it works with elliptical keys and provides forward secrecy. It's used for the key exchange. ECDSA is not widely used though, but it does also use ...
1
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1answer
71 views

Using Keytool to export and change password of certificate in a KeyStore

I'd like to use Keytool to export a certificate from my KeyStore. I'd also like to change the certificate password, is it possible? What I thought should be done is one of the following: 1. Changing ...
1
vote
3answers
48 views

Automatically ensure that a site's certificate (authority) has not changed

My Situation : I've setup my own certificate authority, and generated a certificate for a server used primarily internally. As I understand it, I can configure my browsers/computers to trust the ...
4
votes
2answers
169 views

Risk of self signed certificates with Android

In the OWASP top ten list for mobile, it is mentioned that self-signed certificates should never be allowed. I want to check with others why is this so ? If I have a server back end for my mobile ...
6
votes
1answer
112 views

S/MIME certificates and “information leakage”

I'm considering getting an S/MIME certificate that verifies my name and email address. I've been trying to ascertain what information "leaks" if I do. The Wikipedia page on S/MIME says: Depending ...
1
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1answer
122 views

Safe to store encrypted data with (password protected) pfx file

I have created a self signed certificate using Powershell's New-SelfSignedCertificate, with the intention of encrypting and storing a username / password in public. Specifically using - ...
0
votes
1answer
253 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 ...
4
votes
2answers
76 views

What threats can come from an outdated Certificate in a private LAN

In our company, we use a LAN "about 1,000 users", served with internal servers including email, DNS, and many web servers. Whenever I access any of the network sites, I receive a message about an ...
6
votes
2answers
274 views

What is the best strategy to store and share pem files between team?

Our company's small tech team works with several different servers, to which we connect with pem files. What is a good way of storing the pem files so that it can be accessed by other team members if ...
6
votes
5answers
355 views

Should I accept a self-signed certificate from my university?

My university set up a new domain we (student) can access to do some things. Chrome blocks the loading of the page in question saying that the certificate is invalid: Your connection is not ...
5
votes
3answers
212 views

How to check if your Android app was updated by MitM?

As I was browsing on my phone yesterday, a gray popup appeared on my screen just as I was swiping up, and I accidentally hit the accept button. In the fraction of a second it was on I was able to read ...