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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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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60 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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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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58 views

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
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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58 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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45 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 ...
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1answer
81 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
60 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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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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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
113 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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89 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
130 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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89 views

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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1answer
2k views

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
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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1answer
613 views

Certificate Transparency Android

For iOS-Apps, it is possible to use Certificate Transparency as stated here. We are developing native Apps for the different mobile platforms and are discussing to establish a more secure way of ...
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1answer
236 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
5k views

Bitdefender Antivirus SSL Cert substitution

I am using Bitdefender AV 2013 ed and I have noticed that when the Scan SSL is enabled in the configuration BD will use a local certificate, as mentioned here. This modifies the cert chain with BD as ...
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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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What are Implicit and Explicit Certificates in Public Key Cryptography?

A Public key is certified by a Trusted Certifying authority, to ensure the integrity of the key and authenticity of the entity who claims to have the corresponding private key. In this Public Key ...
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1answer
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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
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.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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5answers
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Are there any downsides to using Let's Encrypt for a website's SSL certificates?

On the advantages side, I see several benefits to using the Let's Encrypt service (e.g., the service is free, easy to setup, and easy to maintain). I'm wondering what, if any, are the disadvantages to ...
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2answers
87 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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11answers
167k views

Provide subjectAltName to OpenSSL directly on the command line

Is it possible to provide a subjectAltName-Extension to the OpenSSL req module directly on the command line? I know it's possible via a openssl.cnf file, but that's not really elegant for batch-...
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2answers
2k views

How to convert my cert chain to PFX without a password

I am trying to enable an Azure Front Door instance on the front of my website using my EV cert (Extended Validation Certificate). However, from Azure Front Door Cert Instructions, Azure Front Door ...
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4 views

Strongswan eap-identity no trusted certificate [migrated]

Here is the situation : GW installed on CentOS7 with Strongswan 5.7.2 with these plugins loaded : charon pkcs11 tpm aesni aes des rc2 sha2 sha1 md4 md5 mgf1 random nonce x509 revocation ...
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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
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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
151 views

Certificate and Path validation for S/MIME

I am working on a S/MIME client development and was wondering if there is a list of certificate and path validation checks that a client needs to perform while validating an email signature. My ...
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2answers
96 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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1answer
97 views

Mutual SSL for clients of SaaS cloud service

My company is launching cloud based SaaS service. There will be clients from different tenants connecting to our services via mutual SSL. The clients would use a library provided by us to connect to ...
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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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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 ...
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1answer
80 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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1answer
177 views

Using NameConstrains in a CA certificate

I am trying to do something similar to what has been pointed out in this nice answer by Jonathon Reinhart. I have a CA certificate with Name Constrains (RFC): Permitted [1]Subtrees (0..0): ...
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2answers
472 views

Is using both client side certificate and JWT for IoT device redundant?

Is there a case to be made for authorizing with both a client side certificate and JWT for an IoT device? Are JWTs good enough (assuming following of the specs)? And if client side certs are truly ...
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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
377 views

What happened with Kazakhstan's Root CA MITM policy?

In 2015 there were news that Kazakhstan was going to start intercepting all HTTPS traffic via "man-in-the-middle attack" starting Jan 1, 2016, by requiring kazakhstanis to install their root CA. ...
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5answers
4k views

Alternatives to HTML's deprecated <keygen> for client certs?

The keygen tag is used to make browsers generate private keys and POST the resulting CSR to the server, which can then issue a certificate. It's now been deprecated, for rather stupid reasons but that'...
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1answer
132 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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2answers
752 views

OpenSSL Certificate Renewal with same keys and NO CSR

I have a Linux-based vendor-supplied virtual appliance that uses OpenSSL to manage certificates. The current server certificate is from Symantec so has to be replaced with a DigiCert. DigiCert is ...
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2answers
25k views

Generate CSR from existing certificate

Can we generate the CSR (certificate signing request) used for certificate signing from the signed certificate? It should work with the original private key when signed again with different authority.