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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12
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1answer
2k views

PayPal encrypted with obsolete cryptography

My Chrome just complained from PayPal's security, similarly to this issue: Google Chrome "Your connection to website is encrypted with obsolete cryptography" The identity is verified, but ...
1
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1answer
18 views

Machine certificates for accessing a web app in IIS only from an specific PC client

We have an ASP.NET web app running in IIS, with about 200 users, some are inside our LAN and other ones are outside our LAN. Every user has a userid account and a password to login. Besides those ...
4
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1answer
343 views

Firebug reports SHA-1 certificate error

For the script at the bottom of this post, Firebug reports the following error: This site makes use of a SHA-1 Certificate; it's recommended you use certificates with signature algorithms that ...
1
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0answers
14 views

using crt for encrypting files/texts [duplicate]

I work with GPGTools under Mac where, after creating a public/private key pair for myself, I usually get .asc from other users, import it and then I'm good to go. Now, I got an actual certificate from ...
8
votes
1answer
410 views

What are the problems with creating an own CA for intranet?

In the comments to Creating my own CA for an intranet several people strongly advise against creating your own CA for an intranet. Especially: don't do it. Nope. Bad idea. Buy $10 CA signed ...
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1answer
38 views

Using a minimal set of certificate authoraties

It been known for quite a while now that SSL is more of a security-illusion than a real one. As it's not completely useless, and there's no real alternative at moment (though convergence looks ...
2
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1answer
27 views

Client side certificates in IIS for accessing a web app only from an specific PC

We have an ASP.NET web app running in IIS, with about 200 users, some are inside our LAN and other ones are outside our LAN. Every user has a userid account and a password to login. Besides those ...
0
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0answers
8 views

Protocol for signing and timestamping documents for e-archive system

we are building system for storing PDF file for long term in database. Before we store PDF file in database we have to: - convert PDF to PDF/A - digitally sign PDF - timestamp it What we don't ...
3
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1answer
69 views

IoT Devices and 39 Month TLS Certificate Life

I develop IoT (Internet of Things) devices on small embedded systems, where it is very difficult to update the local certificate once they have been deployed. It really needs to be avoid if it can. ...
10
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2answers
901 views

How are digital certificates compared?

I have read about SSL and TLS; I know how RSA works and why digital certificates are necessary (more or less), but I am curious about how we prevent a fake digital certificate. The operating system ...
0
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1answer
86 views

Analyzing a TLS connection?

Suppose I want a secure TLS communication between me and myschool.edu. Which of the following should I trust to preserve confidentiality, integrity, and authenticity. Here are the options and my ...
3
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1answer
133 views

HSM maintenance

I have a HSM that is an asset within a information security management system and the help desk team tells me that the device is displaying a critical failure alert. So my questions are: Must I ...
1
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1answer
32 views

Determine private key size using public certificate [duplicate]

I have a public certificate in a PEM (.pem) file -----BEGIN CERTIFICATE----- MIICsjCCAZqgAwIBAgIJAMA1YIQ2JLXDMA0GCSqGSIb3DQEBBQUAMBExDzANBgNV ... 29V/R9RZOoSBHDzGPL84wm4qojMuwQ== ...
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0answers
29 views

Unable to establish handshake using DH key exchange [closed]

I have a requirement to use the cipher suite: DHE-RSA-AES256-GCM-SHA384 I configured to use the required cipher suite on both server and client. During tests, I noticed that the handshake is failing ...
0
votes
2answers
51 views

How much of a certificate is actually covered by the CA's signature?

One of my devs recently had an issue with the compatability of a certificate, and we rooted around for a bit until we came across a a similar problem on SO. Once I understood the developer's initial ...
2
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3answers
38 views

Methods for immediate certificate signing

I'm an absolute newbie in the enterprise CSR and certificate generation process. So kindly point out any obvious silliness in the question. Is it possible to completely automate the process of CSR ...
3
votes
1answer
42 views

How to detect whether a CA used EV for a certificate using openssl

I want to download the certificate of a particular hostname and detect whether the CA used EV (extended validation) when issuing it. So far I was not able to find anything that identifies certificates ...
0
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2answers
125 views

How do google or facebook know I'm behind a man in the middle proxy?

Whenever I'm behind a man in the middle proxy such as burp, and try to access either google or facebook, I get an alert message telling me that the connection is not reliable and blocks the page from ...
0
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1answer
25 views

Tomcat Client authentication

I want to make sure that my webapp is secured: I have a tomcat server - and defined the connector to use clientAuth="true". In my trust store there is only the certificate of my CA (self signed). ...
1
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1answer
53 views

Private CA and client server authentication

I have a private application - that has one server and many clients and I want to use two way authentication(AKA client auth) I use Tomcat server and java keytool to create TLS certificates. If I ...
1
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1answer
26 views

TLS Certificates only for Clients

I'm aware that sites like StartSSL use Client-Certificates, I opened mine in Firefox and it showed me: "SSL-Client-Certificate", "E-Mail-Receiver-Certificate", "E-Mail-Signer-Certificate". Now I'm ...
0
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0answers
51 views

Windows Server 2008 R2 - SHA2 based Cipher Suites [migrated]

I am currently in the process of upgrading the SSL certificates for various websites that I manage from SHA1 to SHA2 compatible certificates. To date we have always used 'RSA' as the key exchange ...
3
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0answers
37 views

Same version of Chrome, two different behavior regarding sha1 depracation [migrated]

i'm well aware of the changes made to Chrome 42 and sha1 signed certificates. Here a short reminder : https://blog.filippo.io/the-unofficial-chrome-sha1-faq/ Our client reported this problem and ...
0
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1answer
58 views

“Transferring” SSL certificate to another person [closed]

Last year, I did a lot of work on a site as a freelancer. We wanted to put the whole thing behind HTTPS, so, for reasons I can't recall but probably expediency-related, I purchased a cert for it under ...
0
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0answers
12 views

UTF8 and T61 strings, how do I see what my SSL cert uses? [migrated]

How do I use the openssl x509 tool to see whether or not my strings are T61 or UTF8 encoded in the cert? Is there a better way?
3
votes
1answer
135 views

Secure Connection between two mobile (Android and/or iOS) devices

I've a Device A which will communicate with multiple devices on a network (BLE and/or NFC). All the devices will be handled a Token upon authentication which somehow needs to be transferred over to ...
5
votes
5answers
193 views

How can I explain self-signed certificates to users?

I don't trust certificate authorities, so I'm using a self-signed certificate on my server. The server provides both a website as well as other services. Most modern SSL-capable software, upon ...
9
votes
1answer
515 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 ...
2
votes
0answers
21 views

How to find more details on Invalid Certificates [migrated]

Setup I am following this blog post to set up ASP.net MVC5 on Linux. When I get to the part that adds the Microsoft certificates, I am warned that they are invalid. For example, this command: ...
5
votes
2answers
218 views

Is cacert.org more harmful than self-signing?

I don't understand the https security model attempted upon me by The OpenBSD Journal (undeadly.org). Instead of using self-signed certificates for https like they did in the past, they for a while ...
11
votes
3answers
3k views

Why is my Positive SSL certificate deemed insecure by Google Chrome? [duplicate]

We run a website over HTTPS with a wildcard certificate from Positive SSL. Today, when I opened Google Chrome (v. 42.0.2311.90 m) and navigated to the site, I noticed a red cross through the https ...
1
vote
2answers
60 views

Website Certificate with different public key

I've installed a ssl certificate from https://www.startssl.com/ in a server running with plesk. The website is the following: https://refood.sal-pimenta.pt/ As you can see the certificate is fine but ...
2
votes
1answer
106 views

Security Structure of an API

I've been developing a web application and APIs for 8 months. I implemented OAuth 2.0 client credentials for authentication. And now I have to implement TLS to my APIs. I've been dealing with SSL/TLS ...
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votes
1answer
82 views

Fiddler Can decrypt https traffic

So apparently, a software called fiddler is able to very easily decrypt secure https traffic with a click of a few buttons: http://docs.telerik.com/fiddler/Configure-Fiddler/Tasks/DecryptHTTPS I ...
0
votes
2answers
67 views

Is the lack of an IP address in the AN field of an SSL certificate a vulnerability?

When accessing a HTTPS site by IP address, if the IP address is not in the alternate names field, the browser will throw an error about the certificate not matching. Would this be considered a low ...
-1
votes
1answer
52 views

Fido U2F Public keys in registration response

What is the deference between the two public keys: user public key (2nd element in Token response) user public key inside signature in U2F Token response for registration ?
0
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0answers
22 views

SSL Handshakes and authentication? [duplicate]

I was just wondering if someone could explain the complete process of SSL handshake with certificates, public - private keys and MAC exchange. And in which cases does the Certificate warnings arise ...
0
votes
1answer
54 views

Can I use a CA certificate for two ways (mutual) authentication

I cannot get an answer from a CA company for this question. I have to implement two ways SSL authentication between my server and my users computers. Users should access to my several API securly. I ...
1
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0answers
72 views

Identify the attestation certificate (X.509) in Fido U2F registration response

I'm trying to identify the attestation certificate (X.509) in Fido U2F registration response as described in fido-u2f-raw-message-formats-v1.0-rd-20141008.pdf document: An attestation certificate ...
2
votes
0answers
28 views

TLS connection to untrusted server - client reaction for dropping connection standardized?

I played around with a man-in-the-middle proxy tool and connected different smart phones to it. As the proxy uses a self signed certificate the tested smartphone apps did not accept the presented ...
0
votes
1answer
95 views

How do I convert a GPG certificate to a CRT certificate that can be imported into Windows Certificate Manager?

I have a GPG certificate from someone used for email -----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG/MacGPG2 v2.0.14 (Darwin) I would like to import that into Windows Certificate Manager So ...
2
votes
1answer
114 views

HTTPS client certificates for server-to-server

Say you have two servers with certificates proving their domains (e.g. for use with HTTPS). Can one of these servers use their certificate as a client certificate when talking to the other, so that ...
3
votes
1answer
145 views

A certificate site name mismatch when using preinstalled Toshiba software? (Superfish?)

On my Toshiba laptop there are a variety of different Toshiba programs that came pre-installed. Many of them are some sort of utility, optimizer, checkup, and update kind of programs that I guess are ...
2
votes
1answer
56 views

Authenticity of PDF document printed from Word

My MS Word Add-In generates PDF preview of DOCX file on client PC and uploads both files to server. I cannot generate PDF on server. Is there any way to make sure that the PDF is the printed version ...
1
vote
1answer
63 views

What exactly is meant by serverAuth and clientAuth

I'm building a network that will allow employees and customers to access the company systems. To that end I'm using a Red Hat Enterprise Linux (RHEL) 7.0 server as a firewall/authentication server. ...
0
votes
2answers
88 views

What is the real use of certificates on the web?

When you get a certificate from a website you visit, signed by a trusted CA, is it trust-worthy because the CA authority did a background check on them? But how does this help with spoof websites? ...
1
vote
1answer
104 views

How to generate self-signed EV SSL Certificate?

I configured XAMPP / Windows on my laptop so that this URL: https://www.supersite.com/ points to XAMPP / localhost rather look elsewhere. I basically generated a self-signing certificate, imported ...
12
votes
2answers
674 views

Why does rfc6797 say “An HSTS Host MUST NOT include the STS header field in HTTP responses over non-secure transport.”

Why does the RFC prohibit the server from sending HSTS to the client over HTTP? I can see that if a HTTP client responds to that unsecure HTTP response it might cause that site to be inaccessible ...
4
votes
1answer
68 views

Security risk: Digitally sign communications for SMB

I have a computer (Windows) on a network where an industrial process is controlled. There is an option in Local Security Policy >> Local Policies >> Security Options >> "Microsoft network client: ...
1
vote
1answer
51 views

Use appstore using trusted certificate [closed]

I connected my iPad to my laptop's localproxy. I also installed a trusted digital certificate in my iPad. I am now able to use all HTTPS networks through my iPad except appstore. If I disable proxy, I ...