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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14
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4answers
1k views

Cloudflare's free SSL options require trusting them, what could they do to change that?

So Cloudflare offers 3 free SSL options: Flexible SSL, Full SSL, and Full Strict SSL. This article explores the shortcomings of the Flexible and Full (non-strict) SSL options: ...
1
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1answer
48 views

Is algorithm used to sign defined by certificate?

Using pfx certificate to sign or cypher, the algorithm used (rsa-1_5, rsa-oaep-mgf1p, etc) is defined inside pfx certificate? Certificate has information about algorithms used? Or it's totally ...
0
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1answer
30 views

Getting a certificate warning for one email but not another

When I log into outlook.com using Chrome browser, I get a certificate warning for one account but not another. One says my connection is private, the other says it "may not be private". Here are the ...
1
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0answers
29 views

Managing/Deploying a code signature certificate - Java Applet

I wonder how to manage/deploy a code signature certificate used by the JVM in a corporate context. Suppose you signed a Java applet (executed in browser by corporate users), how to deal with the ...
2
votes
1answer
51 views

Why not use same certificate for webserver TLS and Signing in SAML?

I have read a bit about configuring shibboleth, and recommendations for SAML at internet2 I get the point that a certificate does not have to be signed when used for SAML, because actually only the ...
-1
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0answers
19 views

Extract iOS application's embedded certificates on Linux [closed]

I am working on iOS applications and want to extract the embedded signing certificate chain from an application. I am aware of tool codesign available on OS X. By running codesign ...
1
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1answer
62 views

Certificate expiry validation - in what stage?

I'm implementing certificate expiry validation for a client. I'm not sure about the following. Is there a standard/popular implementation regarding the order of validation- Check if the ...
1
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3answers
122 views

SHA-1 deprecation and self-signed certificates

I am confusing regarding SHA-1 deprecation. We use self-signed certificates signed with SHA1 and the expiration is after 1 January 2017. According to this blog: ...
1
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0answers
27 views

Certificate Transparency, TLS Extension method of serving SCT's

I was curious about how to supply certificate transparency from my web server. There are 3 ways certificate transparency information can be delivered to the client's browser (Source: ...
-1
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3answers
60 views

Can a website that uses https be absolutely reliable? [duplicate]

Https websites cover some security requirements and certify the author, but how can we be sure that an author of such an https website is not malicious?
2
votes
1answer
104 views

Server sends RST after receiving Client Hello when binding certain certificate

The server environment: Windows Server 2012 R2 + IIS8.5. We are testing three self-signed certificates created by: C#(System.Security.Cryptography.X509Certificates), makecert+pvk2pfx and openssl ...
-3
votes
0answers
21 views

How to disable some ciphers in nsSSL3ciphers command? [migrated]

Referring to Sun Directory Server Man Page Reference, can anybody tell whether - or + is really needed for scenario? I need to: enable only TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, and disable ...
5
votes
1answer
502 views

Point several HTTPS domains to the same web server

We are currently running a SaaS over HTTPS(abc.net) and one of our clients(xyz.com) wants to do some custom branding. The client xyz.com will have their own subdomain xyz.abc.net which looks like its ...
0
votes
1answer
47 views

Relationship between SSL cert database and that at the CA site

Say I am using a trusted third party CA site to manage my cert. I created a new cert called CertA at the CA web interface, downloaded the signed cert and use it on my web server. Some time later I ...
0
votes
1answer
111 views

What to do in case of a weak certificate on my bank's website?

My bank's website, while always having had a 'green lock' in the address bar doesn't have this anymore. I then called the bank with a phone number I found on the same website, and asked that the ...
0
votes
2answers
147 views

How is this SSL spoofing possible?

Here is a description of a seemingly successful SSL certificate spoof: https://cryptostorm.org/viewtopic.php?f=67&t=8713 The session is initiated by pointing a newly-opened icedove window ...
1
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0answers
21 views

Relationship between the validity of license of an accredited CA (certificate authority and the validity of it's certificate? [duplicate]

To more clear, let's see my example: As I know, in Korea, the validity of a CA's license is only 2 years, but the validity of this CA's certificate is 10 years. Why is the valid time of the license ...
4
votes
2answers
337 views

Can an eavesdropper detect the use of a TLS client-side certificate?

Basically what the above says, assuming the eavesdropper must be completely passive, and cannot connect to the server to check if the server requires a client certificate.
4
votes
2answers
253 views

Is it OK to create a new SSL certificate before the old one expires?

Over the past year I have created multiple SSL certificates that are all valid for a year. In a week or so, the first will expire. I thought it would be practical if all my certificates would have the ...
0
votes
0answers
8 views

How to get CSR Value from KeyChain Access [migrated]

So...probably a dumb question but I followed the instructions here And I'm trying to upload my CSR to digicert where the format is suppose to look like this -----BEGIN CERTIFICATE REQUEST----- ...
0
votes
0answers
3 views

How to submit IIS created CSR to StartSSL certificate provider? [migrated]

I'm in process of setting IIS server up with free SSL certitificate from StartSSL. I'm new in this domain. StartSSL seems to be legit to me. My question is regarding point 7 on there website The ...
5
votes
4answers
2k views

Self-signed certificates not working over Internet?

My self-signed certificates are not working over Internet. What can be the problems? Here are the setup details: I have a Windows Virtual Machine in Azure with IIS, and a self-signed certificate ...
4
votes
2answers
46 views

Are X.509 nameConstraints on certificates supported on OS X?

I have the following "chain" of certificates on a test machine right now: A self-signed CA cert, in my Keychain and trusted & trusted by Firefox. A CA cert with with the following, X509v3 Name ...
1
vote
0answers
39 views

Security implications of CA signed SSL cert for local development

Curious to know the security implications and potential risks involved with getting a CA signed cert for localdev.mydomain.com, and issuing it to all the developers who might need to spin up a local ...
0
votes
0answers
545 views

Does Microsoft Edge (Spartan) share Cookies, Cache, Passwords, or TLS Certificates with Internet Explorer?

Windows 10 was released with a new browser called Microsoft Edge. Interestingly, Internet Explorer is also installed on the same default install. Given that Chrome and Firefox tend to separate their ...
2
votes
1answer
30 views

Setting up a wildcard certificate, question about generating CSR?

I have registered a new domain for a project. The hosting is actually done by a vendor. I have set the nameservers according to the vendors specs. Now they are requiring the cert in PFX format. ...
41
votes
3answers
8k views

My friend revealed both private and public keys for his server. How serious is this?

A friend of mine managed to expose both id_rsa and id_rsa.pub file from his server via apache. I mentioned to him that this is serious security issue but he brushed this off like it was no big deal. ...
0
votes
3answers
116 views

Conflict between cipher-suite and certificate

When capturing my SSL session (using Chrome) I have noticed that the server chose TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 (0xc02b) as the cipher-suite and the certificate signedcertificate signature ...
2
votes
0answers
25 views

Creating SSL certificate signed by a self-signed CA certificate in Jetty [migrated]

I'm trying to configure a jetty-distribution-9.3.1.v20150714 backend running on Java 1.8.0_45-b14 with a certificate signed by a self-signed CA certificate, for SSL pinning. Following Apple's guide, ...
0
votes
0answers
9 views

How to verify Signature Value using cert file in C#? [migrated]

I am noob in security sorry for that. I have an xml file which include, <?xml version="1.0" encoding="UTF-8" standalone="no"?> <ID_VG_Response> <Result> ...
3
votes
1answer
70 views

Browsers root CA accepted, countries and checking fingerprints

This is a question derived from several others, and I can not comment on those, so it is not duplicated, please read: In some related questions some users comment that: "They wouldn't ...
1
vote
2answers
49 views

What exactly is IE / Chrome checking when I view the “certification path” tab on cert connection details?

When I bring up certificate details for a web page in IE or Chrome, I have the option to view the certificate hierarchy (under a tab called "Certification Path"). Here's an example for ...
24
votes
5answers
2k views

What prevents a man in the middle from requesting a certificate for your server?

Let's say you have a server at shop.example.com and you are requesting a certificate from some trusted CA like Comodo (they say they'll issue it within few minutes online). First of all, how can ...
1
vote
1answer
39 views

Is there an official standard and/or name for PEM certificate bundles?

This is a question that's not really about security proper. It's about security/crypto nomenclature. It's been bugging me a bit, so here goes: I know two approaches for bundling related ...
0
votes
2answers
62 views

How to identify which root CA does the client certificate use?

How can we identify which root CA client used when there are multiple root CAs on the server? We can compare the public keys of the client certificate and the root certificate but if we have many ...
3
votes
2answers
89 views

Internet Explorer - Advanced Properties for Trusted Root Certificates

If you go to IE -> Internet Options -> Content -> Certificates -> Trusted Root Certification Authorities. Now Click on some CA certificates and click on Advanced You can add properties to the ...
2
votes
2answers
173 views

Should I update my SHA-1 certificates? If so, how?

Q: Should I update my SHA-1 certificates? If so, how? Recently I noticed the "https:" has a red strike-through and warning in Chrome, but only on certain websites. Apparently this has been ...
3
votes
1answer
85 views

How should certificates be shared between a proxy and a frontend?

At work, I've been asked to look into creating a reference topology for a WebSocket chat application, which includes a proxy between the web-facing frontend server and the backend. At the moment, I am ...
4
votes
1answer
271 views

Why does COMODO have 5 root certificates on a new Apple laptop?

Why does Apple include 5 COMODO root certs in OS X? There's "AddTrust {Class 1, External, Public, Qualified} CA Root" and also "COMODO Root Certificate". Why isn't one enough, if it's owned by a ...
-3
votes
1answer
39 views

A collection of tests and demos for security headers and TLS configurations [closed]

There are (or have been) various websites designed to educate and provide examples on good / bad configurations of security headers and TLS configurations (e.g. https://badssl.com/) I want to build a ...
0
votes
2answers
76 views

Unable to “trust” self-signed certificate

I am currently running a setup that interfaces with many appliances running HTTP servers (running on Windows Embedded). The connections I use are HTTPS connections. My problem is, every time I open ...
8
votes
4answers
540 views

What Country, State and City should I choose when requesting an SSL certificate?

I am really confused about the country, state and city I should select when submitting an SSL certificate. Should I provide the location of my servers or my current home address?I can always reissue a ...
8
votes
1answer
62 views

“Manually” verify a certificate

I want to 'manually' verify a certificate and the first step in doing so, I accessed paypal.com and obtained the following RSA modulus and signature value. modulus = ...
1
vote
1answer
100 views

What are these two certificates I need to install - external CA root certificate

I have to install 2 certificates on a computer and I am a little puzzled by the certificates. The first certificate has these details: Issuer: CN = AddTrust External CA Root OU = AddTrust External ...
2
votes
0answers
33 views

OAuth2 Authorization and Resource server certificates

I'm implementing a custom IAuthorizationServerHost using DotNetOpenAuth library. Example implementation uses two certificates for CreateAccessToken (see Listing 6): public AccessTokenResult ...
3
votes
2answers
57 views

Using Different Algorithms in Single PKI

Assume the following Public Key Infrastructure: |Root CA (RSA) |-Sub CA (RSA) |-Sub CA (ECC) Is there any rational that explains why this would not be an acceptable implementation? Is the ...
1
vote
2answers
136 views

What if the Local Windows Cert Store is Compromised?

The diagram below illustrates chaining digital certificates up to a publicly trusted Root Certificate: I have been researching how trusted root authorities (such as GlobalSign or Verisign) are used ...
27
votes
2answers
3k views

Is it safe to send SSL certificates via email?

I just ordered a cheap Comodo PositiveSSL Certificate via a UK reseller, and I was rather surprised to find that the following files were emailed to me automatically, in a zip file: Root CA ...
2
votes
2answers
85 views

OpenSSL x509: Is there an order in subjectName fields?

Is there an order to respect in subjectName field when creating a x509 certificate with OpenSSL command? In other words, what are all possibilities of displaying subjectName of x509 certificate in ...
9
votes
2answers
186 views

What real life scenarios require separate end user certificates for Signing and Identity?

Based on this question, I'm interested in any rational argument that would support the idea of maintaining separate signing and authentication certificates. Conventional logic & wisdom says there ...