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.

learn more… | top users | synonyms

1
vote
1answer
120 views

Is a self-signed SHA-1 certificate sufficient security for a company transmitting sensitive data?

We recently decided to pay an ISP (a substantial sum, mind) for a managed internet service up to and including the router in our head office. Part of the initial discussions made it clear that ...
4
votes
1answer
264 views

Did Google relax their SHA1 deprecation schedule?

In the original post on the subject they said that in Chrome 41: Sites with end-entity certificates that expire on or after 1 January 2017, and which include a SHA-1-based signature as part of the ...
5
votes
1answer
60 views

Do CA Public Audit Records increase the visibility, and risk of attack?

Does the CA feature of Public Audit Records increase the visibility of my hosts, and therefore the risk of host-specific attacks? Would the only mitigation be to only enable this for wildcard ...
1
vote
1answer
43 views

What bits of data is revoked in a CRL? Is it the hash(CSR) or hash(CSR + PKI signature)

My understanding is that a CSR contains the public key from the client, and the response is a signed version of that CSR, with certain attributes (EKU, expiration) and other attributes the CA decides ...
1
vote
1answer
43 views

Possible to change the CA that a keypair is using?

Pretend I take the same CSR and send it to two different CAs as described in the following scenario: I create a CSR on Windows I submit the CSR and edit my SAN names. Request is pending at the CA ...
0
votes
1answer
50 views

CSR signing follow up question

This is a follow up question , after getting a signed certificate from one CA. researched a lot , but no luck. After getting the CA reply, While downloading the certificate, it popped up saying ...
3
votes
3answers
172 views

SSL Cert for sub.domain.com and www.sub.domain.com

I have a wildcard cert issued by godaddy for *.domain.com. currently, https://sub.domain.com works just fine. however, https://www.sub.domain.com does not work. Do I need a separate cert for ...
0
votes
0answers
40 views

Certificate verification

I work on a desktop application which generates Security certificates. The Business use of these certificates is - they will be used as an authentication and authorization mechanism to enable users to ...
3
votes
2answers
84 views

CSR Signing simulation

Tried a lot get my test csr signed from root CA(trial versions option), somehow i am not getting it dues to some of their internal check. Few questions that cropped up Can i somehow signed that ...
23
votes
6answers
3k views

Possibility to sniff HTTPS traffic on devices without installing a certificate

My goal is to sniff the HTTPS traffic of some digital devices (AppleTV, game consoles, etc.), and decrypt the HTTPS packets in my local network. I cannot figure out a way by using some HTTPS ...
1
vote
1answer
93 views

Why deploy a .p12 client certificate bundled with a root CA?

I have been asked to connect to a government agency secure site that uses client certificates to authenticate its clients. I received by email an encrypted client certificate as a PKCS#12 file and by ...
0
votes
1answer
113 views

How does driver install with an expired cert?

I'm working on making a silent installer of WinpkFilter driver. In my silent installation, I'm always getting a (not so silent) prompt that says "Windows can't verify the publisher of this driver ...
1
vote
1answer
674 views

Untrusted connection visiting https://www.opensource.apple.com/

Somebody on Stackoverflow posted some code from https://www.opensource.apple.com/ When I click this link in Firefox (36.0) it says "This Connection is Untrusted". But other people on that thread on ...
2
votes
3answers
321 views

Clarifying self-signed certificates vs root certificate authority

I hope someone can help me understand some fundamentals on SSL certificates that I've had trouble picking up from docs, Wikipedia, and just about everywhere else on the internet. I'm working on an ...
3
votes
1answer
82 views

Does a browser have to make multiple requests to verify an SSL certificate chain?

I've learned that SSL certificates can be chained, and the browser will use the issuer's public key to verify the issuer's signature. I have read this article, which has a very helpful diagram, but it ...
0
votes
3answers
113 views

Do all non-CA certs have to be End Entity certs?

Still learning the differences between certs. Can someone explain? The internet has so far been surprising not lucid in describing certificates. *EDIT to clarify EE
1
vote
1answer
43 views

Protecting the root ca bundle

Applications (e.g. Firefox) often include a root ca bundle file containing trusted certificates. How can I protect those files from malicious agents trying to modify them? I think signing is not an ...
0
votes
1answer
66 views

How do SSL certificates become compromised after expiring [duplicate]

I'm reading into security issues surrounding SSL, and one of that has come up is certificate expiration. The general idea is that once a certificate expires, the site is insecure. What is the ...
1
vote
2answers
88 views

Can revoked certificates be “lost” if the base CRL is updated before expiration?

Assumption Suppose I have a CA that issues a base and a Freshest CRL. I also understand the Freshest CRL to be a Delta of revoked certs in the base. I also understand that clients should pull the ...
0
votes
0answers
41 views

What is the minimum acceptable time for “Freshest CRL” to be updated?

I'm working with MSFT CA, and not sure if this behavior is the same across all CAs, but when I run certutil -CRL, the base revocation cert is updated weekly, and the Freshest CRL (the differential) ...
22
votes
3answers
2k views

Superfish vs. Corporate MITM

I work for a consulting company, and I have been implementing a tool from a security vendor, which is a cloud proxy for all user traffic. It will perform malware scanning and filtering of all web ...
1
vote
0answers
52 views

Making the Firefox key and CSR creation process transparent

Background I was a bit surprised that several CAs do not allow anymore to send a plain old CSR in text form to them which was created in the classic fashion with OpenSSL or similar. But this would ...
1
vote
0answers
51 views

Does Activesync certificate authentication replace a password, or act as 2 factor?

I am looking at Activesync authentication and want to know if Certificate Authentication ignores a client username and password or Certificate Authentication requires a username and password ...
1
vote
0answers
26 views

What are some scenarios I would use MSFT Certificate Enrollment Web Services?

The Certificate Enrollment Policy Web Service and the Certificate Enrollment Web Service are made for non domain connected machines to retrieve certificates of various kinds. When setting this up, I ...
1
vote
1answer
100 views

Best practice for https Private Key Generation

I am working with a security person that baffles me a bit with the practices he performs. Besides the issue of this person insisting on bypassing every security measure in place we have got into it ...
2
votes
1answer
468 views

SSL communication between a C# Server and an Android Client App

I'm using a C# server and a C# tcp client example I extracted from the MSDN and I have created a self signed certificate using makecert.exe. I have got this to communicate with one another and it ...
3
votes
1answer
101 views

Clarification needed on CSR signing process

There doesn't seem to be a lot of in-depth information on the certificate signing process other than: Key Management Interoperability Protocol Usage Guide Version 1.2 (PDF) RFC 2986 - PKCS #10: ...
0
votes
0answers
110 views

Getting Certificate KeyContainerName to initialize CspParameters

How can I get the name of a Key Container that's in a smart card required for initialization of CspParameters? CspParameters^ cspa = gcnew CspParameters(ProviderType, ProviderName, keyContainerName, ...
2
votes
1answer
80 views

How do Client-specific keys and Certificates work?

I have clients that communicates with my server. Clients sends it unique id (guid) to server with its request over a secure https channel. Also to increase security I use my own private-public key ...
10
votes
1answer
438 views

Kaspersky Antivirus “secure connection scan” as broken as Superfish?

I've read a lot about Superfish (and similar ad-ware) lately and I basically understand the vulnerability to MITM attacks. But I'm actually wondering if the "secure connection scan" by Kaspersky ...
2
votes
0answers
48 views

How can I restore my Windows certificate cache so I only have those from trusted CAs? [duplicate]

All this talk about Superfish and other adware crap has made me healthily paranoid that a wrong certificate can enter my certificate cache at any time. I have no reason to assume that there is a ...
0
votes
1answer
115 views

Create certificate without private key with OpenSSL

I know that OpenSSL requires the CSR to be signed for a reason: to assure CSR validity, the fact that it was requested by the actual private key owner of the attached public key. It is absolutely ...
1
vote
2answers
156 views

How to be sure laptop's trusted certificates are safe

I have a Windows 8.1 Lenovo laptop. The evil Superfish app and certificate have been removed. My laptop has 36 certificates in certmgr.msc current user\third-party root certification ...
0
votes
0answers
82 views

How to associate an oAuth token with a particular user. Is this possible?

We have HTTP Rest services and SignalR (aka Web sockets, server send events, etc) for cases in which we need to push data from the server to the Web UI . We are currently using the built in tools that ...
1
vote
1answer
108 views

how to extract a valid digital certificate and put it on other program

I am working on this matter as a graduate, but I need some help. how can extract a valid digital certificate to put it on other program? can I put a digital certificate on other executables and be ...
54
votes
4answers
7k views

Why was the private key of the Superfish certificate so easily extractable?

Robert Graham detailed on the Errata Security blog how he was able to get the private key of the Superfish certificate. I understand that attackers can now use this key to generate certificates of ...
0
votes
0answers
40 views

Additional security for services hosted on a 2FA or Multi-Factor Authenticated Network

I am aiming to lock down a web service that accesses other services and has a publicly facing UI. I have a hosted service on a network that requires 2-factor authentication to access. This service's ...
1
vote
0answers
36 views

Certificate advice for deploying code-signed software as a 3rd party vendor

I am in the process of developing an application for an organization, and am looking for a sanity check on my strategy, especially given the the nature of the SuperFish nonsense that was exposed. The ...
1
vote
0answers
27 views

How can i know my security level as “ SSL 256 bit encryption” [duplicate]

I am using openssl tool to create certificate self-signed certificate I have known that [2048 bit SSL] it is the length of the public key then what about [256 bit encryption] how can i know type of ...
3
votes
1answer
67 views

Is it possible to restrict a client-side certificate (for web auth) valid only for a given site name?

If I have 2 websites, a.example.com and b.example.com. Those sites use TLS and SNI, and require client authentication with certificates created with my own CA. The use case is that some clients have ...
1
vote
0answers
50 views

Proxpy- certificate issue

I am using proxpy, a proxy server written in Python. It comes with its certificates and after installing one of the certificates in Firefox, I got 'Connection is untrusted'. Any help in this regard ...
4
votes
3answers
362 views

What part of TLS specifies how to verify a certificate chain

I have sometimes run into a situation where I see a root CA certificate which is set to expire sooner than the intermediate CA certificate. My question is - if you were interested in keeping your ...
4
votes
2answers
103 views

How should I document my Public Key Infrastructure?

I'm preparing to document a 3 tier PKI (with multiple second level policy CAs) and want to create a document that is useful, technical, and not too overwhelming to the non-PKI expert. I suppose the ...
0
votes
1answer
89 views

What is the purpose of the CA-BUNDLE on a webserver?

So I purchase a certificate from DigiCert. The process goes like this: Generate private key and CSR on web server. Submit CSR to DigiCert. Get a signed certificate back as well as their root ...
2
votes
1answer
553 views

Intercepting HTTPS Android app traffic

I'm trying to intercept Android application traffic from my Android phone....Basically what worked before was that i had simply installed fiddler proxy on my PC, exported the root certificate (and ...
3
votes
1answer
94 views

Why do Certificate Authorites cross-sign each other?

A Certificate Authority (CA) issues digital certificates to certify the ownership of a public key by the named subject of the certificate. What is the rationale for CAs cross-signing each other (i.e. ...
3
votes
4answers
266 views

How can I set my server to only accept requests from my own client app? (similar to SSL Client Certificates)

I'd like to have my server APIs only accept requests from my own app, to prevent other "rogue" clients of my service. As i understand it, the way to do this would be with a "client certificate" that ...
-2
votes
2answers
164 views

How do certificates stop this man in the middle attack?

Alice and Bob are trying to set up a secure conversation, but unknown to them in the middle is Eve, who can intercept and modify all packets sent between them. The communication goes as follows: ...
8
votes
6answers
697 views

Easy explanation of SSL client certificates for a developer

I've been thinking about using client certificates for my web apps, desperately hoping for security-conscious users to put their private key on HSMs so they don't get stolen even if the machine is ...
2
votes
2answers
217 views

If your company/university requires you to install root certificates what protects you from man in the middle attacks?

Let's say that I'm on a university (or company) network that requires you to install a root certificate to connect to their website. Now let's say that you trust these people but not anybody else. Is ...