Questions tagged [certificates]

A piece of data used in public key cryptography (specifically public key infrastructures) 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. For questions specifically about [x509], [certificate-authority], or [public-key-infrastructure], please use those tags.

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x509 certificate with excluded subtree violation issue [migrated]

I would like to use self-signed x509 certificates in our testing environment so I followed the process described in Ivan Ristic's "OpenSSL Cookbook". Great resource. I decided to go the private CA ...
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Cross sign two self signed root CA

I have two self signed root CA that was used for separate kubernetes clusters (say cluster A and B). Both CA is used to sign application certs in their respective cluster. However, one of the ...
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Did google chrome kill public key pinning?

I've read many articles talking about google chrome killing public key pinning in Chrome 67 (May 2018). See here, here, and here. However, I haven't found any information about whether or not they ...
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557 views

Use Personal certificate without a key with Firefox

We have a website that authenticates the user using a certificate. The certificate is installed by the IT department and I can't export it with the private key. When I navigate the website with ...
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148 views

Is Certified | Ethical Hacker (C|EH) a scam or legitimate? [closed]

I've been doing a lot of research on Certified | Ethical Hacker (C|EH) to see if it's a credible certification. But I've stumbled across a Wikipedia article on it and discovered that the sources are ...
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1answer
123 views

Certificate Pinning for WebSockets

I have seen many implementations of certificate pinning for HTTPS connections originated from client-side apps running on mobile devices using native libraries and plugins. I would like to know ...
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567 views

Break into WPA2-Enterprise RADIUS wifi network by stealing credentials

I need to ensure that no un-authorized DEVICE gains access to a wireless LAN network. Notice I said, "device". This means that I need to ensure that only authorized personnel can join the LAN and ...
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How are Chrome and Firefox validating SSL Certificates?

How are Chrome and Firefox validating SSL Certificates? Are they requesting data from an SSL certification website, like GeoTrust, to validate the certificate received from the web server?
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1answer
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Is a SSL client required to try multiple certificate chains?

Yesteday, 10 July 2019 I failed to access dict.tu-chemnitz.de with Epiphany (WebKit2, which is using GNUTLS) and mailed the administrator which fixed it quickly. Here is the access via GNUTLS: $ ...
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Certificate Pinning with SockJS

What is the SockJS way of pinning SSL Certificates in the client side when contacting wss:// to avoid CA trust? FYI, when using modules like HTTPS or WS, we can listen to the socket event and then on ...
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172 views

Why does pinning a CA root certificate not present a security risk?

AWS recommends pinning their root certificate when implementing SSL pinning. My understanding is that SSL pinning for mobile applications mitigates a situation where an attacker has installed a ...
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Does SSL inspection break applications utilizing certificate pinning?

A number of popular mobile apps utilize certificate pinning, such as Facebook. Does this mean that these applications cease to function completely on corporate and academic networks that utilize SSL ...
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SSL/TLS Extended Validation implemented in fraudulent domains

People trust green bars, because it is proven to not to be of malicious origin. This seems to be the questions of hundreds and many are concerned about it, picture that; a team of fraudsters(or at ...
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Why is my gf seeing a localhost self signed certificate when going to netflix?

Recently my gf told me she was receiving errors when trying to go to netflix. I took a look and the certificate is super wierd saying it is self signed. Why could this be happening? She only uses the ...
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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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Websocket connection hostname check

I am testing an application that uses both regular http rest requests and websockets. Burp cert is installed on the device I am using for the tests. I can intercept the encrypted traffic using Burp. ...
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How to create a self-signed client-certificate without a CA?

I tried A lot of articles online generating certificates using openssl, but unfortunately none of them worked for me :( There is a website that everytime I visit throws me this error: Sorry, but ...
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CSP/KSP module for MacOS

My company developed a custom Key Storage Provider for Microsoft CAPI so that CNG-using Windows apps can perform signatures using a remote signature service. I would like to know if there is support ...
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4answers
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Is there a way to make sure my government does not swap out SSL certificates?

I was recently wondering whether there exists a way to make sure my government is not swapping out SSL certificates in order to intercept the traffic. I know almost all browsers are complaining in ...
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How does the OpenSSL Alternative chains certificate forgery (CVE-2015-1793) attack work?

The security advisory for the issue can be found here: https://www.openssl.org/news/secadv_20150709.txt OpenSSL Security Advisory [9 Jul 2015] Alternative chains certificate forgery (CVE-2015-...
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1answer
55 views

Feedback for self-signed certificates setup for custom product auth?

HW (linux) <---Eth---> Official PC (win,mac,linux) | | ----> Man-in-the-middle eavesdrop I'm looking to prevent an unauthorized party inside the ...
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1answer
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Can we keep our customer's X509 Certificate as BLOB on our server?

I have a scenario in which I need to use the customer's X509 certificate and passphrase for executing their web services. Now, I need to know what will it be a security breach if I store customers' ...
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Your connection will not be private - Wi-Fi CA certificate warning message on Android

I try to connect to a Wi-Fi network, Eduroam, using my new Android device. It asks me to provide the CA certificate and warns that otherwise my connection would not be private. No certificate ...
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217 views

Am I safe after importing Bitdefender's fake certificate?

I installed Bitdefender today and suddenly I couln't navigate to numerous websites that I used to visit (I use Mozilla Firefox). I got the error: SEC_ERROR_UNKNOWN_ISSUER. I searched a bit and found ...
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Can my company see my network traffic if their certificate doesn't appear in the web browser? [duplicate]

I have a work-issued Mac, when I go to keychain access right now these are the following certificates: AddTrust External CA Root (Root certificate authority) COMODO RSA Certification Authority (Root ...
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1answer
338 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 ...
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Do client certificates provide protection against MITM?

I'm looking for a way to protect clients from a MITM attack without using a VPN, and ToR. My thought is that client certificates might do the job, but I'm not entirely sure since not too much server ...
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Why doesn't form based authentication use digest instead of plain text

In form based authentication the credentials are sent as such within the message, whereas in digest based authentication a digest of credentials, domain name and a random challenge is sent instead. ...
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3answers
10k 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 ...
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4k views

Can you sign using a digital certificate itself?

Googling I saw several lectures saying that it is possible to sign using digital certificates. I am confused about that, because according to my knowledge it is possible to sign only using the private ...
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1answer
56 views

.Net WebClient - self signed certificate

I have two applications (.net) on two web-servers. The first application will need to do a request (via WebClient) to the second and get results. I need to ensure Encryption, data integrity, and ...
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Unable to get information from a PKCS certificate

I sniffed the communication between the client and the server using Wireshark, and I found out that during the handshake session, the client sends its certificate to the server. I've managed to get ...
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What would happen to the connection when certificate expires? [duplicate]

We are using X509 certificate to connect between on-premise devices to the cloud services (Device provisioning service from Azure) The expiry date of the certificate is 3 years from now. Once the ...
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1answer
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Why am I receiving this error message when browsing nvidia.com?

I'm receiving this randomly when I try to visit nvidia.com. I can either not reach the site at all with a 504 error, or I get this screen. What does it mean, and what is the cause?
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Where do TLS clients fetch intermediate CA certificates from? [duplicate]

When I use my browser (a TLS client) to navigate to a secure web page (e.g. https://example.com), during the TLS handshake, the browser will receive an end-entity certificate from the web server of ...
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What are the security protections in using a TPM generated VSC to create a CSR

I am extremely new to the field of information security but was given a project to create a secure TLS certificate signed by our CA for a new security process. I found this thread (How to generate a ...
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Non-TLS-authoritative ZSKs?

Under DANE, the digital chain of trust goes (roughly): [Public visibility of the ceremony for the generation of the] ICANN Root Zone Key, which something something involving the TLD authorities and ...
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1answer
51 views

Windows certificate manager imports a SHA256 root CA certificate as SHA1

I generated the root CA test cert using: makecert -a sha256 -n "CN=RootCATest" -r -sv RootCATest.pvk RootCATest.cer I've imported this root CA certificate on another machine (Win Server 2019, ...
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112 views

SSL handshake: Client Hello and Server Hello

I am trying to understand how a client communicates with a server when using a proxy. The client is an Android device, whom the traffic is proxied to the server through mitmproxy. This is my topology:...
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Extracting .p12 cert and key without OpenSSL

I've asked a question on SO, but was directed here since it might align better with this SE. The problem I have is that I need to extract the certificate and key in unencrypted PEM format for use in ...
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1answer
90 views

Signature of a root certificate - CA authority

Created a root certificate(cacert.pem) and tried viewing the content to primarily understand the contents of certificate, mainly the signature appended to certificate. Below is the text output of ...
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1answer
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SSL/TLS certifcate secure on Chrome but not on Firefox

My organization have emitted TLS certificate for Https. It appears as secure when I access the page with Chrome but non secure with FireFox. Is there a difference between these two browsers about how ...
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What is the purpose/role of the “alias” attribute in Java keystore files?

I've heard conflicting information about the purpose of the alias attribute in Java keystore files. Can someone please clarify on what exactly this attribute is, and what it should be set to when ...
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0answers
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RFC 5280 compliant certificate with x509 extensions

First time posting here, be gentle. Situation: I have a requirement, to link our printer/scanner to our Azure AD (so that it can lookup users etc.). I have enabled Azure AD Domain Services with LDAP ...
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2answers
347 views

Why is openssl complaining that my certificate chain is self-signed?

I am trying to set up a certificate chain for a lab server. I have created my own root CA, an intermediate CA and a server certificate. I supplied these certificates along with the server key to the ...
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0answers
111 views

Why is certificate rejected in firefox, but not IE and Chrome

Question: Is a certificate issued to a subdomain valid for a CNAME in the parent domain assuming a common root CA cert and SAN listing both? (I think the answer is no but I'm uncertain). Is there a ...
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2answers
135 views

How are UUIDs assigned in P2P protocols

I am learning about P2P in general (mainly blockchain). I know many P2P protocols uses a distributed hash table for node lookup (kademlia) that maps UUIDs of nodes to their addresses. I am curious ...
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Can I sign with two Code Signing certs to build reputation on the newer one?

I recently acquired a Microsoft Authenticode Code-signing certificate as a new certificate using an identical name to another one which will expire soon. Obviously, the new certificate has no ...
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The difference between Subject Key Identifier and sha1Fingerprint in X509 Certificates

I have some SW that extracts certificates data and the SW utilizes OpenSSL. I am confused what is the difference between the subjectKeyIdentifier and the sha1Fingerprint. Both are hash values. My ...
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2answers
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Changing the SSL certificate chain

When connecting to a resource with SSL, I know that the certificates can be validated by the client to make sure the connection is secure. I recently run into SSL problems at work, when connected to ...