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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Can you sign using a digital signature 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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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
79 views

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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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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1answer
61 views

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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62 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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0answers
49 views

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 ...
2
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1answer
62 views

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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1answer
82 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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22 views

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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90 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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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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2answers
116 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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2answers
131 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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2answers
75 views

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 ...
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0answers
34 views

Software build processes - Dependencies without admin privileges

we have the following problem and I would like to hear your opinions for this case: Currently several users are working with domain accounts which are in the local admin group (Yes, shame...) You ...
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106 views

My school is making everyone install SSL certificates and without it you cannot access the school network [duplicate]

This is the certificate they are making everyone install. Exactly what can they access using this and should I be concerned about my privacy?
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1answer
45 views

How would I get the issuer's public key from two RSA-signed certificates? [closed]

I'm trying to get the issuer's public key from two SSL client certificates signed with a 2048-bit RSA key, SHA-256 hashing and PKCS#1 padding, as I only know the issuer's DN and I wish to verify all ...
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1answer
49 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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2answers
88 views

TLS: Clarification on trust in the certificate trust chain

Suppose I have the following trust chain in my trust store: ROOT_CERT | |---INTERMEDIATE_CERT_1 | |---INTERMEDIATE_CERT_2 I know that any certificate that is signed by INTERMEDIATE_CERT_2 ...
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2answers
94 views

Assuming that everyone always performs a revocation check, do we still need expiration time in each certificate? [duplicate]

I understand that each public key certificate includes an expiration time, and a CRL is issued periodically, listing all currently revoked certificates. However, in class we were told to think about ...
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1answer
42 views

How hard is it to retrieve IKEv2 Server Certificate from the server?

I got access to a VPN via IPsec and IKEv2. The provider gave me a username, a shared secret and a server certificate. Since the certificate was self-signed, the manual came with specific instructions ...
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What are the risks involved in blindly trusting all certificates for https requests over unknown proxy servers? [closed]

My use case is a Java application where no sensitive data being transmitted whatsoever, and the response being accurate (i.e. unmodified) is unimportant.
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0answers
101 views

open ssl: Verify return code: 2 (unable to get issuer certificate) [closed]

I have 3 certificates: root_ca.pem (self signed cert CA) issuing_ca.pem (Intermediate CA signed by root ca) user.pem (user cert signed by intermediate ca) If I try to validate the chain with openssl ...
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1answer
49 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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0answers
18 views

Certificate Validation with SDS enabled on Ingress Gateway and mode set to MUTUAL

I have been having some difficulty understanding the mechanism by which certificates are validated by either party in a mutual TLS handshake. I have SDS enabled on my ingress gateway(s) and the ...
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0answers
35 views

Addons still work with Firefox on one account

I'm using Firefox 66.0.3 on Ubuntu, and like everyone else I'm experiencing the certificate bug which causes addons to be disabled. However, in one of my user accounts, the addons still work like a ...
2
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1answer
81 views

How do partial wildcards in subjectAltName dNSName interact with IDNA domains?

For instance if I run IDNA encode bücher.tld you receive xn--bcher-kva.tld. Now imagine the certificate for https://bücher.tld has the following field within subjectAltName: (dNSName, xn--bcher*.tld). ...
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2answers
99 views

Convert CSR to self-signed x509 Certificate

Is it possible to receive a certificate request (CSR) and convert it to a self-signed X509 Certificate without having access to the private key that signed the CSR? I want to do the following: receive ...
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44 views

Usage of a self-signed certificate between Akamai and Azure

First of all, some background of what is proposed: The client's browser initialises request The request is resolved by public DNS (CNAME) to Akamai Edge The request is processed by Akamai accordingly ...
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1answer
138 views

Prevent bypassing of SSL Pinning in android application

I am creating an android application which is able to ping the server for certain information and return them. There are a few methods by which a user can bypass the pinned SSL certificate of an ...
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1answer
56 views

Employer Self Signed Root Certificate

I don't have knowledge into programming/cybersecurity so I stumbled upon this site and figured I'd ask a quick question. I worked for about 3 years at company and left as of last week. I don't know ...
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1answer
71 views

tls custom system trusted certificate on android6 not working [closed]

I encounter the same problem as the user has in this post: Why does Samsung Android browser say our site has a valid certificate, but the site identity has not been verified? The accepted answer is: ...
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2answers
101 views

Are SAN IP addresses / DNS names useless in self signed certificates by untrusted CAs?

I want to generate a self signed certificate for temporary local testing of a web service via HTTPS. I don't want to install the CA though, because the self signed certificate is generated on the fly ...
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0answers
29 views

SQRC use to verify e-delivered certificate

I have a need to provide a means of validating a certificate that is e-delivered. My thought is to use an SQRC to enable that verification by linking to a secure site that contains the original ...
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0answers
39 views

same CA, same CN [duplicate]

Can you order several certs from the same CA, in which only the DN differs, but the CN is the same? Will they accept a second request for the same CN or maybe then put the first cert on the ...
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0answers
60 views

Is Mobile ID secure? Certificates on SIM card (Mobile identity management)

In Switzerland Mobile ID is popular. It looks like it's international known as Mobile identity management. Mobile identity is a development of online authentication and digital signatures, where ...
2
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1answer
60 views

Is it OK to set SSL fullchain to service

Imagine service with SSL-server authentication. There are 3 certificates in chain: Root CA certificate; Intermediate CA certificate; Host certificate. Is it ok to put all 3 certificates (fullchain) ...
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1answer
46 views

ADCS two tier PKI

Planning a two tier ADCS PKI infrastructure as follows: ORCA ____________|____________ | | | SCA1 SCA2 SCA3 one.int two.int three.int ...
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1answer
239 views

Why do VPN Providers ask for installation of Root CA?

I've seen a lot of VPN providers and they all seem to agree on one thing: ask user to install their own Root CA. I don't get why they do it. A legit server should have a certificate generated by ...
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1answer
289 views

Why don't CAs sell certificates as files, instead of hardware or as a service?

I'm trying to purchase multiple certificates, some just signing, some just encrypting, and some a combination of the two. I wanted to purchase one signed by a CA, rather than using a self-signed one. ...
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1answer
72 views

Is there any standard that encrypts domain name of the certificate?

I guess widely used protocols today don't encrypt the domain names in TLS certificates. Does HTTP/3 and TLS 1.3 encrypt domain names of web sites?
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1answer
54 views

No certificate found alert in nodejs https server in mobile

I have created a website using nodejs . And using ssl certificate from sslforfree.com . It is working fine on desktop and i checked it in SSL Checker it is working fine . But in mobile it is showing ...
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1answer
125 views

Duplicate subject names for intermediate and root certificates

I work in an organization which is employing what I believe to be a non-standard and problematic PKI system for internally used certificates. They issue multiple root certificates and intermediate ...
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22 views

Securing a large application with multiple services and endpoints

Without getting too deep into the architecture, I would like to get suggestions / good reads on applying encryption to a large scale application with multiple endpoints. There are internal and ...
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0answers
29 views

authenticating SSL client certificates on server

current setup: i have a pki setup which issues client certificates to the users (so that only clients with the certificate can access the web application). was looking for ways to implement this and i ...
0
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1answer
55 views

How to make sure certifi python package is up to date

In python's requests module documentation, I find this important recommendation: For the sake of security we recommend upgrading certifi frequently! Q: How can I make sure that my system's certifi ...
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1answer
44 views

Finding the reason behind an RDP Certificate Change (man in the middle attack?)

I've installed some new networking equipment: firewall, switches, vlans, etc. I won't mention the brand name here, because I don't want to cause them harm by my suspicions. Right after doing this, I ...
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2answers
268 views

Does client have to send the CA chain along with the client certificate after ServerHello?

During the MTLS handshake, after ServerHello is done client sends the client certificate back to the server, I need to know if the client should only send the client certificate or is it required to ...