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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Security of SSL certificates bought via resellers

There are many SSL certificate resellers - some are well known enterprises with good reputation (e.g. domain name registrars) while others are small and unknown companies. It is clear that resellers ...
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40 views

Connecting to postgres with SSL

I need help understanding some basics about the postgres database server and SSL. I am developing a Windows desktop application that will connect to a postgres database, in single user mode, with both ...
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1answer
181 views

Multi Domain SSL for different ip? [closed]

i have 5 domains(example.com,example2.net...) hosted on separate servers. is possible to use one Multi domain SSL certificate for these domain ?
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1answer
3k views

Why does Windows Ship with Expired SSL Certificates?

I am cleaning up the certificate stores on my Windows machines, and considering which certificates I should keep, and which ones I should delete. Why does a fresh install of Windows Server 2012 R2 ...
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1answer
148 views

Is TLS in Tor useless?

I am trying to optimize the Orchid Tor client library for my needs and noticed that every connection with every node uses TLS with turned off certificate verification. Actually there are no TLS ...
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2answers
138 views

Using my own encryption instead of https in app

I am writing a program that uses a webserver as a backend for communication between different users. Is it okay to use my own encryption (such as ...
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1answer
50 views

Should a private key be protected by a password even if the software using it needs to know that password?

We have an embedded device running a web server. That web server uses HTTPS and so has a private certificate which is embedded on the device. Right now we are unsure if this private key should be ...
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1answer
58 views

Is digital certificate with 'issued to' field as *.example.com valid?

Came across a Digital Certificate which has issued to field *.example.com Is this a valid certificate?
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7 views

How do I keep our website certificate confidential? [migrated]

I want to keep our SSL key for our website confidential where it's stored on 2 USB sticks, one in a safe deposit box and one I keep secure. And then I'm the only one who applies it to the web server ...
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1answer
52 views

Is my sha1 SSL cert safe if they expire before 2016?

According to the Google [1], if my SSL cert expire after 2016 and at some points they will show a warning. But, if all my cert expired before 2016, so I assume no action need to be taken to prevent ...
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1answer
39 views

generate certificate at runtime and validate

I have a project that require client application to register and then use the services. I would like to do the following: A client app sends a request with IP, domain name, etc. to my REST service ...
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1answer
63 views

certificate authentication between apps

I have a .NET MVC Application which is hosted in IIS. Users of the Application will be company only and it will be access so it will be on the intranet - app wont be exposed via internet. Within IIS I ...
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1answer
40 views

Should the thumbprint be SHA2 in addition to the Signature Hash Algorithm?

I'm looking at a Windows PKI and see that the Thumbprint is SHA1, while the Signature is SHA2 (SHA256). Is this an acceptable configuration? Should I recommend that the client update to SHA2 for a ...
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2answers
68 views

What kind of SSL certificate do I need? [duplicate]

I am making a web site which can be considered similar to Reddit in some ways. I need to implement a sign up form so I will store informations about the users. My idea is to store the username, ...
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2answers
48 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 ...
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1answer
89 views

MITM faking certificates

I am looking at the theory behind MITM attacks in order to see some unencrypted packets from the 3DS. From research here is what I understand so far: 3DS > Proxy > Nintendo server I am going to try ...
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2answers
63 views

Corporate PKI - SHA1 deprecation

Here is the context. Suppose you have a corporate PKI with : AC_Root (offline in safe store - SHA1 signature) SubRootA and SubrootB (offline in safe store - SHA1 signature) SubSubRootC, SubSubRootD, ...
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46 views

Certificate Errors with bad Date Time settings [migrated]

I have recently solved an issue with IE 11 where I was getting certificate errors to google.com bing.com was fine no problems I tried a number of different things till seeing a post referring to ...
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1answer
49 views

Can javascript code served by a server under HTTPS talk to another server under a subdomain with a different certificate?

Lets assume we have two servers : (1) https://adomain.com (2) https://abc.x.adomain.com The each have different certificates, (2) has a wildcard and (1) does not. If we remove https from the ...
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3answers
137 views

Steps to find out whether a SSL certificate is trustworthy

For doing business with a company I have to browse to https://www.prioenergie.de/nc/mein-prioenergie.html (German website). Firefox says the certificate is invalid, because it is not signed by a ...
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2answers
124 views

Why Google Chrome complains about mozilla.org identity?

On a "brand new" (but fully updated) Windows XP installation (an Asus EeePC that I restored to factory setting and than updated with all Microsoft's upgrades) I installed a few days ago Google Chrome. ...
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0answers
33 views

How to add basicConstraints extention to a self signed certificate

Using openssl to create a self signed certificate. The certificate needs to have the Basic Constraints value defined and showing in the cert but I can't seem to be finding the right location to modify ...
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0answers
54 views

Why is the public key extracted from the CSR different than the one extracted from the associated certificate?

I am playing around with pyopenssl. I am trying to extract the public key from a CSR and to check if it is the same than the one I find in the associated certificate. There is a small difference ...
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1answer
99 views

How will SHA1 deprecation affect SHA1 roots in OS/Browser trust stores.

I understand the SHA1 deprecation policy applies to CA's issuing SHA2 end-entity certs and intermediates starting Jan 2017 but how will this policy affect the actual root certificates in OS/Browser ...
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1answer
1k views

Why is 'avast! Web/Mail Shield Root' listed as CA for google.com?

I just noticed something weird in my browser: the certificate for www.google.com has been issued by avast! Web/Mail Shield Root. Should I be worried? I am using avast! Antivirus so it's probably a ...
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5answers
186 views

Can we have https without certificates?

I apologize in advance if I am fundamentally misunderstanding something, but is it possible to have encrypted communication protocols (https, I suppose) without resorting to a certificate system? ...
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2answers
106 views

Will CA's still validate internal IP's in SSL certs?

Just wondering what Certificate Authority (CA) policy is nowadays on validating someone's internal IP address in a certificate? I have heard that some CA's used to do this but won't anymore.
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43 views

Why does IP address need to be listed as a DNS name in SAN/UCC certs?

I have heard that when creating a CSR that if you want to validate an IP address that you should list the IP as a "DNS" name and not "IP Address". I have actually had to re-create CSR's like this to ...
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2answers
256 views

What's the difference between X.509 and PKCS#7 Certificate?

Am I correct calling file with .p7b file extension saved as 'Cryptographic Message Syntax Standard - PKCS#7 Certificates (.P7B)' in Windows - a 'PKCS#7 certificate'? Or is it better called 'X.509 ...
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1answer
80 views

How does a browser choose which certificate to use if my web server has multiple certificates?

I'm using Apache 2.4, with two certificates, one RSA signed by CACert, and one ECC self-signed. Neither of these certificates provide a path to a broswer-trusted root certificate. My question is ...
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39 views

Question regarding SSL / TLS / Certificates in general [duplicate]

for the last two days I played around a bit with nginx's SSL configuration. A question came up: I created asymmetric key using $ openssl req -x509 -sha256 -nodes -days 365 -newkey rsa:4096 -keyout ...
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3answers
447 views

TLS library problem when connecting to Dovecot

I have a Comodo PositiveSSL certificate issued for mail.btcontract.com and I've set up Postfix and Dovecot to work with it in the following way: Postfix main.cf: smtpd_tls_cert_file = ...
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1answer
42 views

How to change the expiration time for the pkcs certificate?

I have an application (which I'm testing), in which I create some services. These services are accessible via libraries i.e java and python apis. In order to authenticate the api calls, the ...
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1answer
137 views

Can Fiddler decrypt HTTPS traffic when using elliptic curves + client cert authetication?

Case 1 involves TLS + client certificate authentication with both client and server using secp384 based EC certificates. In this case, when monitoring traffic via fiddler, the tunneling/handshaking as ...
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4answers
1k views

How to prove Bob has received Alice message

I have read up on Digital signature and it is stated that it provides non-repudation. Assuming Alice signs the message using her private key and sends it to Bob, Bob can use Alice's public key to ...
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2answers
107 views

To trust, or not to trust? Adding exceptions to the Trusted Certificates List in (firefox) Light

I recently installed the Light (a more compact forking of Firefox). I started getting the "This Connection is Untrusted" error, which got me wondering: when should I add an exception to the list of ...
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0answers
27 views

Why do some unrelated websites (appear to) share certificates? [duplicate]

If you browse to https://blog.stackoverflow.com/ you see a certificate error. In Chrome: This server could not prove that it is blog.stackoverflow.com; its security certificate is from ...
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2answers
135 views

How to be sure that downloaded file is correct? [duplicate]

Last week I read a lot about security. I have a basic understanding how public keys or private keys works. But I still have a lot of questions I can't find an answer. Right now I'm interested in ...
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1answer
54 views

Machine Certificate Key File Artifacts

When a new machine certificate is imported with a private key a MachineKey file is generated in "%ProgramData%\Microsoft\Crypto\RSA\MachineKeys". When using the certificate mmc snapin or removing a ...
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1answer
375 views

SSL interception with Burp Suite using Firefox - Strange behavior when intercepting twitter

I am learning Burp Suite(Free Edition v1.6). I have set it up with the default settings. The proxy listener is listening to 127.0.0.1 on port 8080 and Certificate option is set to 'Generate CA-signed ...
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2answers
248 views

Intercepting SSL traffic on Android app

I am trying to intercept SSL traffic from my Android app to test the security. I am using certificate pinning in the hopes I can prevent people from snooping. I have tested by configuring ProxyDroid ...
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1answer
139 views

Mac OS X : Certificates signed by company trusted CA cannot be verified

I'm trying to setup a keychain on Apache Tomcat that contains a server certificate that was signed by a custom root ca certificate. (not sure if custom is the right word here, but it's a root ...
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2answers
190 views

Validating an SSL certificate chain according to RFC 5280: Am I understanding this correctly?

we're in the process of replacing certificates with SHA1 hash due to Google's move to let them appear less secure in Chrome. The replacement certificates use a different intermediate CA than the ones ...
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1answer
160 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 ...
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1answer
60 views

How to make a decent Certificate Signing Request (CSR)?

I'd like to know how to make a decent Certificate Signing Request (CSR) to secure my website and e-mail with a wildcard SSL certificate. With recent exploits as POODLE on SSLv3 and such, I'd like to ...
3
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1answer
44 views

Clarification on the -h Flag for Makecert.exe

When using Microsoft's Makecert.exe to generate a certificate (and key), there is the option to allegedly "specify the maximum height of the tree below that certificate", using the -h flag (see MSDN). ...
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1answer
177 views

Isn't this a broken certificate chain?

My certificate provider responded to my CSR with four certificates, the first being "ours", and the remaining three presumably to build a chain of trust. I've never had to investigate (and prove to ...
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4answers
852 views

How bad it is to install another company's root certificate to your server?

Our company uses a web server with a couple of web sites on it (private and public, over HTTP and HTTPS, some low risk and some high risk including online payments or other sensitive data for ...
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1answer
36 views

Can an end-entity certificate with SHA-1 be issued by an intermediate CA that has SHA-256?

Just curious - if I'm using an end-entity (leaf) certificate that has a SHA-1 signature, does that mean that ALL certificates in the chain also must use SHA-1?
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53 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 ...