Certificate Revocation is a process through which we make sure that those certificates that are not considered valid are not used by relying parties.

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How can I use unique PKI from host to client

I have hundreds of machines i would like to have unique credentials/certs on. I also have a even more cell phones i need to run diagnostics on the machines. Is there a way i can do this? I will also ...
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2k views

When does iOS check validity of enterprise certificates?

Here is an article that should give a little more context (and see my comment on it, same username, for additional info). iOS developers are able to distribute apps outside of the App Store using an ...
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22 views

Create revocation certificate for all user IDs

My OpenPGP key consists of three identities and two subkeys. I now would like to create a revocation certificate for the master key. pub 4096R/2J9F2349 2016-05-10 [expires: 2016-11-06] uid ...
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1answer
73 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 ...
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1answer
16 views

Does it matter what version of GnuPG I use to create revocation certificates?

Today I am about to create a bunch of revocation certificates for all of my emails. Why? Because it already happened to me in the past, that I lost my private key, or my computer was compromised. It ...
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1answer
48 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 ...
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2answers
36 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?
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1answer
36 views

Revoking signing keys: do they still work afterwards?

Scenario: I have multiple signing subkeys, each for every portable device (i.e laptop). None of them have private master key (it is deleted following the tips in Alex Cabal's post. One of the devices ...
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1answer
127 views

Understanding how does certificate validation work

I'm using Wireshark for better understanding how is a SSL connection established. I captured the traffic of visiting three pages: reddit, facebook and this one. All HTTPS of course. Reddit: after the ...
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3answers
816 views

Certificate Transparency

From what I read here, if the intermediate CA has been compromised, a fake cert can be issued and the privacy of the end-users could be compromised as well. In order to remediate this situation, ...
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2answers
85 views

What does “revoking” a key actually do?

I am currently encrypting some personal information using gpg (gpgdir actually). I have a copy of my private key printed onto a sheet of paper in the form of a data matrix lest I lose the digital copy ...
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1answer
2k views

Has the leaked D-Link windows signing key been revoked?

Recently news broke as to D-Link mistakenly publishing a private code-signing key as part of an open source framework. The D-Link key was leaked in late February, and expired on September 3, it ...
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1answer
50 views

How is validating an SSL certificate against a CRL not inefficient?

My understanding is that CRL is a list from a CA that says what certificates not to trust. Browsers will regularly download these lists from their trusted CAs and check the certificate of requested ...
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1answer
19 views

Do I need separate revocation certificates for each email address associated with a key?

I just created my first OpenPGP key with GnuPG + Thunderbird + Enigmail. The key is used for two email addresses. Now I created a revocation certificate. There is only on of the email addresses ...
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2answers
127 views

Why do so many browsers show sites with revoked certificates?

Everyone seems to agree that it is REALLY important to protect private keys so the encrypted Internet can remain just that (see for example at How do certification authorities store their private root ...
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2answers
160 views

Is there any mechanism to audit which signed certificates are unrevoked?

We are currently using EasyRSA and OpenSSL to manage our user VPN certificates for OpenVPN. The process we have in place currently is: User generates a CSR on their laptop and sends it to us to sign ...
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1answer
130 views

How to revoke certificates, or generate CRL files with Keytool

I didn't find how to use java keytool to revoke certificates or generate CRL files. Is it possible to do that with keytool? If no, how to do it with openssl ?
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2answers
378 views

S/MIME certificate expired and renewed, do my correspondents have to do anything?

My PKI certificate (Digital ID for email from Symantec, issuer is "VeriSign Client External Certification Authority - G3") expired after 1 year and so I have renewed it. Do the people I correspond ...
3
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2answers
93 views

Cetificate Pinning. How do we handle the situation where a website is visited for the first time?

What I essentially mean to ask is, how is the scenario where a user who visits a website for the first time (the certificate for the website is not pinned in the browser) handled ? Additionally how is ...
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2answers
245 views

SSL certificate renewal and downtime due to revocation

We are in the process of renewing an SSL certificate, mainly for the forced use of SHA256. It is my understanding that a new Certificate Signing Request (CSR) has to be issued for the same host name, ...
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3answers
5k views

Why are Certificate Revocation List periodically renewed?

While studying a security course I have been asked this very question: Why are CRL periodically renewed, even if there are no new revoked certificates to add to the list? Honestly I can't find the ...
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1answer
225 views

Did D-Link's certificate revocation really only invalidate 1 day (of a six months long exposure)?

I'm trying to wrap my head around the OCSP revocationTime for D-Link's certificate. I recently answered another question and ended up drafting a timeline. That timeline is basically this: Jul 5 ...
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1answer
101 views

How to check which certificate is being checked for revocation?

I have a .net desktop application without a certificate on a network not connected to the Internet When I start it, there is a call to crl.microsoft.com that times out and slows down the application. ...
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29 views

How to test rootCA for issue subCA certificate

Can I check rootCA for issue subCA test certificate before issue real subCA cert? If rootCA issue test certificate and revoke immediately, then all operation log is recorded. Do this compliance with ...
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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 ...
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133 views

How to generate “CRL numbers” for X.509 CRL

(Context: I'm working a process to publish a CRL periodically -- eg once every day.) With standard X.509 certificates, "serial numbers" are required to be positive integers, but they do not need to ...
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3answers
99 views

Compromised Issuing CA

I'm configuring a PKI infrastructure with an offline root CA and several issuing CAs. Among other topics, I'm struggling to decide how the revokation of an Issuing CA certificate works. My Root CA ...
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1answer
737 views

Why isn't there a certificate revocation request standard?

Say I am building a Certificate Authority software and I want to automate certificate revocation as much as possible. I know it will not be possible in some cases, like if the building where the ...
3
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1answer
187 views

How to trust a CA to sign a CRL but not a cert?

In my application, there are many parties that are trusted to revoke a cert (ie by signing a CRL), but are not trusted to sign (new) certs. How do I mark a CA to be trusted only for CRLs, and not for ...
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2answers
807 views

ISO 27001 failure to comply

Say a small company just earned an ISO 27001 accreditation. What happens if during one of the audits it is found that the company didn't follow the ISMS? Is there a certain warning process that ...
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2answers
205 views

Check signature when next CRL will be published after end of validity of certificate

My situation looks like this: I have to verify signature on document. For this I will wait when next CRL will be published to check that involved certificate was not revoked. But what if certificate ...
10
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1answer
850 views

Should I use a Certificate Revocation List?

I've been trying to provide security to my API. I will issue certificates to my clients to access my API through a TLS channel. So it'll be a SSL-Client Authentication. I'm wondering, should I use ...
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2k views

Is there any malicious reason to block CRLs?

I've noticed that in order to 'illegally' crack certain applications, it is necessary to patch the host file to stop communication with the activation servers. I've found that with several ...
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63 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 ...
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208 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 ...
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1answer
265 views

Is long-term validity definitively corrupted upon TSA certificate revocation?

Suppose a document that was signed with a long-term signature (e.g. CAdES-A): D S T1 (D - document, S - signature, T1 - time-stamp created using a time-stamping certificate C1). If C1 appears in the ...
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1answer
44 views

Mail Signing Certificate – What are the impacts when revocated?

Suppose I open a signed mail on 1st January 2000, signature is OK. What about this two cases : 1) If next CRL is to be published one week later, I found it strange that it is “probably” valid until ...
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2answers
7k views

Trying to get rid of hackers who have access to all my devices [closed]

What is the best way to go about getting rid of hackers that have gained access to all my personal computers, (both old and recently purchased) phones, and even random computers I use to simply get ...
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3answers
264 views

The best way to change my pgp key

I would like to change my pgp key because I have the same one 2 years ago. But, I want to warn my freinds that the owner of the old key and the owner of the new one is the same person (me). hwat is ...
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1k views

Is publishing CRLs over HTTP a potential vulnerability?

I noticed that at least one major CA (Comodo) publishes their CRL over HTTP rather than HTTPS. This seems to me to be somewhat of a vulnerability, as an attacker could hijack the HTTP connection that ...
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2answers
276 views

SHA1 - S/MIME and CRL validity after deprecation?

In an internal PKI using SHA1 for hashing, will S/MIME signature and CRL/ARL signature be considered invalid in the next few years (SHA1 Deprecation) ? End certificates can be revoked, CA ...
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1answer
91 views

Can I store a GPG revoke certificate online?

It's clearly a good idea to store the revocation certificate in a way which is both secure and reliable. Cloud-based storage services are great for reliability, but of course they lack of security. ...
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4answers
224 views

Temporarily suspending a Certificate Authority's Certiticate

The PKI RFC talks about revoking or suspending certificates. It also talks about revoking CA certs. However, I could not find anything about whether a CA or a Sub CA's certificates can be revoked or ...
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2answers
264 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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1answer
117 views

Keep OpenPGP revocation certificate in safe place?

Do I have to keep the revocation certificate of my OpenPGP key in a safe place or may I place it in e.g. Dropbox to have it ready on all my machines? I know that, if compromised, the certificate can ...
0
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1answer
74 views

What are valid OpenPGP revocation signature types?

I'm working on an analysis of the full OpenPGP keyring (ca. 3.8 million keys). I imported all keys to a local instance of hockeypuck (keyserver implemented in go). Hockeypuck uses a PostgreSQL ...
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2answers
2k views

Website Certificate Revocation check - Big deal? [duplicate]

As I was about to make payment for my flight ticket, I noticed something strange with the British Airways website's SSL cert. My browser (Google Chrome) was unable to check whether the certificate has ...
6
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2answers
525 views

How can we revoke all ssl certificates issued for our domain?

After having the hostmaster@domain.com email compromised, we found that someone issued a Domain Validated SSL certificate for our domain. Now we want to have all such certificates revoked. Is there ...
2
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2answers
141 views

Should expired compromised certificates be taken care of if the time is always correct?

I am trying to set up a CA for my company, and issuing every employee a digital certificate and a private key. I am worrying about revocation and expiration. In my case, the root certificate of CA is ...
8
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1answer
141 views

What considerations should apply for self service Renewing, Revoking, or Unrevoking a certificate?

I need to design a self service portal for renewing, revoking, and unrevoking a certificate and have come up with the following rules*: Renewal Certificates have a short term validity and need to ...