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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5answers
112 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 ...
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1answer
49 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
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0answers
18 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 ...
5
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1answer
1k 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 wonder.....
5
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1answer
87 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
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1answer
153 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
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3answers
141 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
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0answers
86 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
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2answers
76 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 ...
1
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2answers
26 views

Mandadory checks a client should make to verify a ssl/tls certificate [duplicate]

Let's say I have a client, not a browser, that wants to connect with https to a server. It could be a python program, an android app or a library etc. Suppose the client has a list of trusted CAs and ...
3
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1answer
49 views

What security impact is caused by a TLS server continuing the handshake when presented with an invalid SNI?

RFC 6066 defines Server Name Indication as an extension, whereby virtualised web servers may be given an SNI extension in order to know which certificate should be presented. It has the following to ...
31
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2answers
2k views

Can a SSL certificate have longer validity period than its parent in X.509 chain?

When a X.509 certificate chain is composed of X1, X2 ... Xn and Xn is root CA, Can a certificate in lower level have longer validity period than its parents? I think that lower level should be proper ...
1
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0answers
46 views

OCSP recording with JMeter

How can I record an application which is using OCSP security with the help of JMeter? I am not able to record the application i.e. a native app with the help of JMeter as it is using OCSP protocol ...
1
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1answer
79 views

How to determine effective trust chain for cert on MacOS X?

I'm seeing some curious issues with cert verification for an Issuer: Entrust - L1K cert that was issued and is in use (per inspection of the cert in Chrome and Firefox) for an internal site here. I ...
1
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0answers
35 views

How to provide our customers ability to self service client certificate creation?

We have an API for B2B customers to access our platform. We require each B2B customer to have a client certificate. This is not the URL SSL certificate (https). The CN of each customer's client ...
1
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0answers
41 views

What comes into calculation of certificate signature?

I have written my own code with openssl in order to create certificates. In order to verify this code, I tried to reconstruct an openssl commandline generated self-signed certificate ... openssl req -...
2
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0answers
34 views

Disadvantages of self signed and cross signed certificates? [closed]

Can anyone explain what are the disadvantages or loopholes in self signed and cross signed certificates?
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2answers
117 views

Can I move my private-key to a better token?

I recently purchased a personal signing certificate from GlobalSign - it wasn't cheap either. It arrived yesterday. GlobalSign gave me a "blank" USB security token device - a SafeNet eToken 5100. ...
1
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1answer
44 views

which the field represents digital signature value of CA in a certificate?

Normally CA signs the certificate with its private key and produces digital signature of it.The digital signature value will be displayed in certificate. My question is what is the field name that ...
4
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2answers
50 views

What is the difference between Digital certification revocation and retiring?

Certificate management tools use options called revocation and retiring digital certificates.Can someone explain what is the difference between both?
2
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1answer
69 views

Can I revoke a client certificate using only it's serial number (not it's crt/pem)?

I've signed and issued some client certificates with my CA. I can now revoke them like so: openssl ca -name ${CA_NAME} -revoke ${USERS_DIR}/${USERNAME}.crt -keyfile $SSL_PRIVATE_DIR/ca.key -cert $...
0
votes
1answer
114 views

Java / Android Client-Server application. Digital certificates and CAs

I'm currently developing an application for Android that will allow users to back up their data on a server, which I am also developing in Java. I've pretty much completed the development of the ...
7
votes
4answers
256 views

Bank website forwards to false site - formatted hard drive - still forwards

Summary: When I visit my bank's website, I get forwarded to a phishing mirror site. This has persisted through a re-format of my MacBook. Even on different browsers! Other computers on the same ...
3
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0answers
129 views

Modify Certificate Subject using OpenSSL x509 Command

I'm building a CA based on the OpenSSL command line tools. I don't want to use the openssl ca tool and its file based database though, instead I create certificates using the openssl x509 tool ...
4
votes
2answers
253 views

Certificate Chain - intermediate and root certificate - installed required?

Recently I bought a SSL cert from comodo for my domain - orakoha.com After submitting the CSR etc, domain control verification etc, I am issued with a zip file containing 4 document which I believe ...
10
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2answers
213 views

Prevent and/or detect installation of root certificates on Windows?

I noticed that some applications installed root certificates on my computer. Is it possible to prevent this? Or is there a firewall or such that notifies me?
0
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1answer
54 views

Can MITM redirect my HttpsURLConnection?

Scenario: Let's say a MITM was able to plant a faked, self-signed certificate on my client (Android app), instead of the self-signed certificate of my server. When now my app tries to connect to the ...
3
votes
1answer
198 views

How to simply check if a certificate has the OCSP must-staple attribute?

http://tools.ietf.org/html/rfc7633 https://blog.mozilla.org/security/2015/11/23/improving-revocation-ocsp-must-staple-and-short-lived-certificates/ How can I simple check if a certificate of a ...
1
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1answer
37 views

SSL certificates for a mixture of subdomains and top level domains [closed]

In order to provide https-enabled access to several (e.g. around 5) subdomains and several top level domains on different IPs. Which of the following approaches is technically feasible? a one-use ...
1
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2answers
84 views

understanding client certificate - pfx on the general

Today I am given a pfx and told to access a website. I have absolutely no idea what was given to me initially, so please kindly confirm my understanding on a general level 1) the pfx is a container ...
1
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2answers
66 views

Subdomains on a multidomain EV SSL [closed]

I have a domain https://joshmurray.eu/ which has a Standard SSL certificate. I also have two subdomains: http://one.joshmurray.eu/ and http://two.joshmurray.eu/. I wish to upgrade my SSL certificate ...
0
votes
2answers
41 views

Files related/required to a digital certificate

I am new to digital certification and I am trying to understand it as well as get my domain certified. I know this question may be broad, but can someone give me a general idea of the usage of the ...
1
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1answer
64 views

Subject Alt Name certs

Is it ok to specify subdomains in certificates that support SAN. For example base domain is example.com and I want a.example.com, b.example.com, and c.example.com to be included? What is the primary ...
5
votes
1answer
167 views

How To Bypass SSL pinning In SPDY protocol?

I have been trying for almost a month to intercept the traffic of an android app the uses SSL pinning. I used Android-SSL-TrustKiller and SSLUnpinning but it did not work.I also decompiled the app and ...
15
votes
5answers
3k views

How can trusting ONE certificate jeopardize everything I do online?

I am not sure I understand how TLS works correctly. To my understanding trusting a certain website's certificate is all about trusting that website or not, but the questions below suggest that ...
1
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2answers
63 views

What are the steps to take after adding an invalid certificat authority?

in order to pay my bills online internet , I have to go through the website for my internet provider , type the login and password then I redirect to a page your connection is not private i proceed to ...
1
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2answers
102 views

Certificate handling on a small network VPN

Background - I need to set up secure remote access for a small home office. I'm a bit of a noob and haven't needed to handle certificates before. I understand most of the setup but I want to ...
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0answers
29 views

Certificate transparency monitoring [closed]

Does exists monitoring for certificate transparency logs ? For example, a web service how send you an email each time a new certificate for a specific domain is seen in a CT log ?
0
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2answers
46 views

Local certification authority and certificate chain

I know that I can set up a local certification authority for a local network. I can issue certificates for all the devices in my network, and as long as they trust me, they can use such certificates ...
6
votes
2answers
799 views

Can I use my old SSL certificate with websites in subfolders?

We have a single domain SSL for a website that looks like this: www.website.company.com We are going to expand and do following: www.website.company.com www.website.company.com/dk www.website....
3
votes
2answers
271 views

Use openssl to individually verify components of a certificate chain

This is related to another question, How to verify a signature of one entity by another using OpenSSL CLI? I used openssl s_client -showcerts -connect www.google.com:443 to collect three certificates ...
3
votes
2answers
212 views

How to check if I have a rogue SSL/TLS certificate?

It's known, that if someone manages to install their certificate as a trusted certificate on your Windows computer, they can read all you SSl/TLS traffic with man-in-the-middle attack and you won't ...
1
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1answer
18 views

Conditions for reusing client certs in TLSv1

In my setup I am using client certs, and the client devices are iPhones running iOS 9.0. In comparing some network traces I noticed that in some cases, the server asks for the client certificate for ...
2
votes
1answer
57 views

Will browsers trust an expired self sign certificate in the Trusted Root store

I recently discovered that if Windows AD LDS services are bound to a self signed certificate, that processes will continue to trust the cert even if it's expired. My guess is this is because the cert ...
0
votes
1answer
99 views

Are Free SSL/TLS Certificates Trustworthy ? Can Cert Providers Snoop On Traffic? [duplicate]

I know nothing about encryption, SSL, TLS, certificates and have come across several companies offering free SSL/TLS certificates. How trustworthy are these offers? Why would I want to adopt this ...
-2
votes
1answer
166 views

Are VPNs for iPhones vulnerable to hacking?

I use VPNs all the time on my iPhone to get around websites being blocked and sometimes just for privacy, but are they secure? In this video the guy installed a certificate on the lady's phone that ...
3
votes
1answer
71 views

SSL negotiating too low a protocol?

I'm trying to diagnose a potential SSL/TLS problem between a Mac client and a Windows server. I have generated my own root cert and signed a cert for the server, and installed the root cert on the ...
2
votes
3answers
261 views

Why doesn't openssl s_client correctly validate google.com:443?

I try $ openssl s_client -connect www.google.com:443 but it openssl complains that the cert chain is invalid: $ openssl s_client -connect www.google.com:443 CONNECTED(00000003) depth=2 C = US, O = ...
28
votes
3answers
2k views

Does any technology prevent a CA unilaterally revoking a certificate?

As far as I can tell, a CA is in a position to unilaterally revoke a certificate via the standard mechanisms (CRL, OCSP). In an increasingly TLS world, what current technology stops a CA shutting ...
3
votes
1answer
94 views

How to verify a signature of one entity by another using OpenSSL CLI?

I'm teaching a class about certificate chains, so I download the chain from www.google.com which has 4 certs. I want to demonstrate how the dependencies work from issuer to subject by showing that ...