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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What is the state of the Windows Update certificate after Flame?

May 28, The Flame malware is discovered in Iran and by Kaspersky Labs. June 5, Dan Goodin (Ars Technica) points out that Flame had hijacked WindowsUpdate, spreading signed malware through that ...
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924 views

Is it okay to just secure (using SSL) the login page, but not the rest of the site? [duplicate]

Possible Duplicate: What are the pros and cons of site wide SSL (https)? I'm creating a custom PHP/MySQL CMS for a client (because Wordpress is overkill for this client's particular needs). ...
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3answers
580 views

How are possible uses for X.509 (SSL) certificates denoted?

X.509 certificates can be used for servers, clients, email, code signing and more applications. http://twitpic.com/6gdxaq indicates that a certificate can have different of these 'capabilities' on it ...
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164 views

From a trust perspective, is renewing a CA certificate the same as trusting a sub-CA?

I'm trying to understand the validation logic that would occur in the following hypothetical scenario An unpatched XP user who trusts a list of root CAs. Those CAs in particular have been renewed ...
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196 views

How would you know a certificate/private key if you extracted it from RAM? Or would you?

Related to, of course, the heartbleed vulnerability, I've been reading the news about the worst case scenario for this attack being the extraction of the SSL private key, because, of course, this ...
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616 views

How practical is a certificate's “basic constraint” property in protecting my HTTPS / SSL session?

Suppose a leaf node creates a certificate for a different domain, acting as a CA. Do most popular frameworks, or SSL chain validation tools verify the constraints? Are there any I should be ...
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257 views

Protecting the Java keystore with a weak password, what's the risk?

From my understanding, the Java keystore contains certificate information, but this information is public (i.e. other machine certificates which you want the local machine to trust). Is there ...
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217 views

Certificate Revocation List

There are many fields on a certificate revocation list (CRL) like Algorithm, Parameters, Issuer Name, This update date, Next update date, user certificate serial #, etc. While I understand the purpose ...
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1k views

What is a Certification Path in SSL certificate?

I've been trying to learn more about Digital certificates for the past few days and I'm struggling in order to understand how actually this concept is applied in the real world. Anyways, as I visited ...
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1answer
548 views

Use Client Certificate using Self Signed CA while using Web Certificate of a publicly trusted CA

I would like to ask if it is possible to use different CA for the client certificate and the web certificate? For example, I would use Verisign to sign my web certificate while I use my Self Sign ...
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1answer
134 views

How to secure a certificate internally

Say I have a certificate which I use to sign the software I ship. This happens in the (daily or more) build on the buildserver (Windows machine). Easiest solution would be to put the certificate file ...
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800 views

What did the certificate authority do with my CSR?

I needed to reach a web service which is not mine. The IT department of that web service has asked me to send them a CSR (certificate signing request). Then, he will send me back a signed certificate ...
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567 views

What are the real-time applications of long term digital signature with timestamp

I want to know the real time applications that uses digital signatures with timestamps. Specially I am interested to know the applications where we can trust an old signed document which is now ...
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809 views

How long shall a certificate be valid?

See title. Are there any sources where there are recommended validity times of certificates (based on length, algo, etc)? I'm particularly interested in validity of RSA certificates...
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2k views

SSL encryption and SSL certificates

I know for a fact that it's possible for for an SSL\TLS session to go on without an SSL certificate, meaning you pass encrypted data, but you don't have a solid foundation of who you are really ...
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625 views

Web Certificate invalidation - You might be connecting to a website that is pretending to be [Site name]

Recently while trying to log-in to Facebook this notification starts to appear: At first I ignored it (by pressing Continue), but it started to popup every time I navigate through the website! I ...
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1answer
1k views

Android Kitkat reports: “Network May Be Monitored by an Unknown Third Party” when using non-default root CA

My company uses a private PKI to handle such scenarios such as Mutual auth (TLS) to a website using client certificates SSL web server certificates on an Intranet (once a VPN session is ...
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1answer
193 views

How is an Authenticode timestamp verified?

For an Authenticode signed file to be verifiable by Windows after the original signing certificate has expired (typically 1-3 years after issue), the file also needs to have a cryptographically signed ...
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589 views

Single domain SSL certificates, actually support 2 subdomains?

While browsing for SSL certificates, specifically domain validation type (the cheapest), I noticed that they advertise as valid for a single domain/subdomain, but then I noticed that they are valid ...
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3answers
547 views

Why are SSL certificates valid only from a certain date?

Each SSL certificate is valid starting from a specific date and up to the expiration date. What's the point in that "valid from" date? Why do we want a certificate to only be valid after a specific ...
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2k views

Is an AIA or CRL useful / required at the Root CA if that Root is used to cross certify another PKI?

Suppose I have several independent PKIs that are used Two internal PKIs: One with SHA1 support the other with Suite B algorithms. A partner who I trust and have a policy map with. Since both my ...
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3answers
395 views

Does the following data stream look secure to you?

I understand the basic concept of SSL but maybe I am missing the point. Please could someone take a look at the following part of a test log to a server and tell me if it looks secure. My concerns are ...
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207 views

TLS server key: possible to sign another TLS server key?

If I have a valid (verifiable) certificate C_K_s that links the server key K_s to "www.example.com", is it possible to : use K_s to sign K_d, and let S_K_d be this signature use K_d as the TLS ...
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1k views

Can a certificate have multiple chains and multiple self-signed roots?

The following MSFT document has this paragraph: All possible certificate chains are built using locally cached certificates. If none of the certificate chains ends in a self-signed ...
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1answer
852 views

How secure is TOTP key on phones?

Our company is considering several options in moving to MFA with software OATH TOTP or yubikey OATH OTP. In regards to where the secret is stored, I'm aware that a yubikey or similar hardware device ...
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684 views

Is there any research on which SSL certificate authority has the best browser compatibility

We're about to release a service that requires website owners to embed our javascript code on their site which will then serve the script from our server similar to Google Analytics. (yes I'm aware of ...
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1answer
595 views

What is the impact of certificate validation level (or class) on deployed web applications?

Certificates can have a class level (or validation level). What is the impact of these levels on deployed web applications? More specifically: Is the certificate level included in the certificate ...
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275 views

Cellphones IMEI public exposed?

Currently I'm in the middle of a developement process, and I have some security questions for you. I have a webservice, asp.net which is configured to run over https. The first authentication step for ...
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1answer
2k views

Which extensions to use for a S/MIME certificate?

Analogously to the SSL server certificate question, which extensions should I use for S/MIME, and should the CA be restricted somehow as well? (I'm using openssl, which at the moment creates CA and ...
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3k views

Extensions for SSL server certificate

I have some question about the X.509 v3 extensions. What extensions should appear in a proper certificate for a SSL server ?
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74 views

Standards for CA cert revocation and time-constrained cryptographic algorithm parameters

I'm working on software that will be in use for foreseeable future (15 years+) that will need to validate XAdES-A signatures (long term archival, similar to PAdES-A, but for XML). That means, it will ...
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2answers
678 views

Is it possible to modify a CA without having to reissue all of the derived certificates?

Background: I have my own authoritative certificate that I generated myself for signing certificates for services my friends and I use, including web server, ircd, etc. It's convenient because I ...
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4answers
728 views

Clients trust my custom CA

I'm sorry if this is a dumb question. I'm new to all this. I have a large number of users. I need to be able to generate SSL certs for various internal domain names. All of these certs need to be ...
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873 views

Is DIGEST-MD5 secure if done over HTTPS?

If the DIGEST-MD5 negotiation is done over an HTTPS connection instead of HTTP, does that prevent this list of disadvantages from Wikipedia?: Digest access authentication is intended as a security ...
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802 views

X.509 algorithm identifier parameters vs. extension values

From the X.509 specs: AlgorithmIdentifier ::= SEQUENCE { algorithm OBJECT IDENTIFIER, parameters ANY DEFINED BY algorithm OPTIONAL } ...
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273 views

How secure is a https website? [duplicate]

Possible Duplicate: Does an established ssl connection mean a line is really secure When I visit a website -- say, https://ebanking.pick-your-bank.com -- my browser (fully patched version ...
4
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1answer
106 views

Are there any public examples of an encrypted attribute in a Verisign-issued certificate?

This Credentica- UProve paper describes how Verisign issues (or did issue in the past) certs with encrypted attributes: "VeriSign issues certificates that contain encrypted attributes that can be ...
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Using SSL Certification in Multiple Locations

I have some issues with respect to using SSL Certificates. I have a website hosted in UK and I also have an organisation in South Africa hosting my company application online for web access. The ...
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1answer
780 views

Would introducing client certificates for a mobile app improve security?

I have developed a REST API which has been configured to only operate over HTTPS. The sole purpose of this API (at least for the moment) is to operate as the backend entry point for a mobile ...
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1answer
2k views

AIA/CRL locations for Offline Root

I've read the answer to the following "Checklist on building an Offline Root & Intermediate Certificate Authority (CA)" and I have one questions based on the system I am trying building It's an ...
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908 views

How to create an Apple Installer Package Signing Certificate

How can we create a certificate with the following Extended Key Usage extension using OpenSSL? Extended Key Usage extension, critical, with a purpose containing Developer ID Installer Package Code ...
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86 views

Does SSH authorized_keys violate the principle of “re-authenticate before password change”?

It is generally accepted that password change mechanisms should ask the user for their old password (e.g. OWASP) The reason being that an attacker who has temporary access to a user's session (be it ...
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how to import a private key in windows

Say I have an X.509 cert and a private key that corresponds to it. I can import X.509 certs easily enough into Windows but what about private keys? Is the only way I can do that by converting both ...
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1answer
170 views

How does my antivirus determine which CTL is used?

I have imported a trusted root certificate into the Windows local machine list. This works fine with my signed certificates, unless my AV (Bitdefender Antivirus Plus 2012) is set to "scan SSL", in ...
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82 views

What is the meaning of http://uri.etsi.org/TrstSvc/eSigDir-1999-93-EC-TrustedList/SvcInfoExt/RootCA-QC from ETSI TS 102 231 V3.1.2

From Technical Spec http://uri.etsi.org/TrstSvc/eSigDir-1999-93-EC-TrustedList/SvcInfoExt/RootCA-QC a Root Certification Authority from which a certification path can be established down to ...
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4answers
2k views

I had SSL certificate on my site but still it has been hacked…how to prevent this from happening?

I used SSL certificate on my site but still it has been hacked. How do I prevent this from happening? Do SSL certificate come with a waranty which would compensate me because my site was hacked?
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766 views

Self signed certificates for https

Where I work, currently for internal sites, self signed certificates are being used. In Firefox, the info regarding the certificate are displayed: site domain: example.com Owner: Site doesn't supply ...
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Two-factor authentication w/certificate and username & password?

Example scenario: ActiveSync Authentication method: certificate-based authentication AND Active Directory domain username-password Encrypted on device: public & private key AD username ...
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150 views

How does iOS prevent unauthorised code from running?

I'm just wondering. How does iOS prevent someone from executing code on their device that isn't from Apple or downloaded from the App Store? Also what exactly, does a Jailbreak do to allow ...
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2answers
507 views

What is the difference between EV-SSL certificates and Normal SSL certificates? [duplicate]

Recently while looking at several banking URLs I can see the domain name with security certificate at address bar and normal locker security certificate at address bar. Have a look at the screenshots: ...