SSL (Secure Sockets Layer) and/or TLS (Transport Layer Security)

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Trust a non-root CA in OpenSSL

Is it possible to have OpenSSL trust a non-root CA such that a certificate signed by that non-root CA can be properly verified? I've noticed that the default behavior for OpenSSL is to only verify ...
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1answer
153 views

Can closing port 80 lead to more security?

If a website is running on HTTPS only, is it reasonable to close port 80 of the web server and only leave port 443 open? Does this action provide more security for the website?
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1answer
116 views

How to diagnose No Certificate alert

I have written an application (in C#) to communicate with one of our customers via a web service. Our customer requires us to use bi-directional SSL. The customer has sent us their certificate (in ...
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4answers
21k views

What is certificate pinning?

I'm superficially familiar with SSL and what certs do. Recently I saw some discussion on cert pinning but there wasn't a definition. A DDG search didn't turn up anything useful. What is certificate ...
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1answer
131 views

Private Key and Public Key Serial Number and Thumbprints

Are the private key Serial numbers and thumbprints the same as the corresponding public key Serial numbers and thumbprints for certificates (X509Certificates, Base64-encoded X.509), and are these good ...
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3answers
2k views

How to sniff traffic on my wireless network?

For educational purposes, I want to see what packages are sent over my home wifi with VPN on and off. What program should I use for this?
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0answers
29 views

Use TLS certificate as both server and client?

For a federated server-to-server protocol with domain-based identities, I am thinking of using TLS client certificates as authentication mechanism. I figured that re-using each peer's TLS server ...
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4answers
112 views

What's the best way to secure inter-server communication for cloud servers?

I'm looking for best-practices or suggestions to secure inter-server communications between VPSs. Should I just run all traffic through SSH? What about HTTP Traffic via something like mongo? ...
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1answer
138 views

Is there a benefit to having SSL connections on localhost?

I have a mail server with a MySQL database back-end. The mail server and MySQL DB are both installed on the same Windows machine. Is there any benefit to using SSL connections between the two ...
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0answers
76 views

Do the BEAST and CRIME attacks apply to an IMAP service?

While setting up the Dovecot IMAP service, I noticed that the default parameters are not optimal, it allows SSLv3 for example. Using Thomas Pournin's TestSSLServer.java program, I saw the following: ...
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1answer
37 views

Key Management in Interception Proxies?

I'm reading Jarmoc's Black Hat presentation on SSL/TLS Interception Proxies and Transitive Trust. I have a few questions on some of the key management practices. In the paper, Jarmoc states: To ...
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3answers
136 views

Why can't someone break email or https encryption by somehow getting access to the encryption key?

To repeat, "Why can't someone break email or https encryption by somehow getting access to the encryption key?" In other words, why can't someone intercept the key, or the algorithm to create the ...
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1answer
60 views

Home banking site request, it possible for a small web agency?

I'm working in a web agency, i have a request to made an home banking system for a little bank. I'm searching in internet for some information about security and a good pattern to start, but naturally ...
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2answers
73 views

Corporate IT monitoring and access to user private data (keylogging? https data transmission?) [closed]

I work at a large company that requires employees to sign a digital certification saying that we recognize the right of the said company to monitor all data and communication on our work laptops, and ...
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0answers
66 views

Is my approach to anonymous certificate based HTTP(s) authentication and secure private messaging sound?

I'm trying to work out a somewhat anonymous secure messaging system, and was hoping someone could validate my overall approach. Keep in mind, this all takes place over HTTPS. Authentication While ...
1
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1answer
117 views

How should IPSec be configured to provide a protection at least as good as my current Stunnel configuration?

In private network (as in using a private IP address space) at a cloud provider, other customers have access to the same private network. I have secured the communication between many hosts and ...
1
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1answer
67 views

HTTP security headers on non HTML (images, JavaScript, etc)

Let's say, the HTTP security headers below are applied to all HTML pages of a site: HTTP Strict Transport Security (HSTS) X-Frame-Options (XFO) X-XSS-Protection X-Content-Type-Options Is it OK to ...
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4answers
276 views

Outbound proxy which whitelists by server certificate?

Short version: Are you aware of any proxy or firewall device which will permit outbound SSL connections to hosts with approved* SSL certificates only? Long version: Consider the following ...
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1answer
47 views

Does the .net mvc/iis stack support whitelists for bidirectional authentication for SSL/TLS connections?

I'd like to limit access to some of my REST api, such that only bidirectional SSL/TLS connections are accepted, where the "other side" matches a detailed, restricted, whitelist. Is this something ...
175
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8answers
15k views

How is it possible that people observing an HTTPS connection being established wouldn't know how to decrypt it?

I've often heard it said that if you're logging in to a website - a bank, GMail, whatever - via HTTPS, that the information you transmit is safe from snooping by 3rd parties. I've always been a little ...
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2answers
238 views

POST over HTTPS “secure enough” for sensitive data?

I'm wondering if to prevent the possibility of a compromised SSL certificate leading to the potential for sensitive information disclosure if it might be prudent to further encrypt data being passed ...
3
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1answer
69 views

What are industry-standard recommended practices to protect user information in an Android app?

I am developing an Android app that will potentially handle sensitive user data, and some of it may be even considered medical data (for example user height, weight, alergies, etc). What would be the ...
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4answers
145 views

Secure communication between server and client [duplicate]

I'm writing some security software, and don't want anyone to be able to intercept data as its passed from client->server, and server->client. The best way to do this is over HTTPS via SSL. However, ...
2
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3answers
138 views

Does the principle of the CRIME & BEAST attack affect VPNs?

I was recently reading about the attacks on SSL/TLS that CRIME and BEAST were able to exploit by attacking the compression in the secure session. Upon reading this I remembered that OpenVPN has ...
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2answers
1k views

1024-bit DHE vs 2048-bit RSA

Currently with apache/mod_ssl, if DHE is enabled then a 1024-bit ephemeral key will be used. I found the following quote in Adam Langley's blog: Ideally the DH group would match or exceed the RSA ...
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3answers
91 views

Using public/private key without signed certificate

I am working on a java program and I am now working on its network security. I want to use a secure connection since it transfers a lot of sensitive information. On all security guides it is mentioned ...
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0answers
20 views

Protecting client's data over the wire [duplicate]

I'm writing some security software, and don't want anyone to be able to intercept data as its passed from client->server, and server->client. The best way to do this is over HTTPS via SSL. However, ...
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1answer
977 views

SSL Handshake failed

I’m working on windows desktop application which is created using C++ (IDE : Qt creator). It has login panel, where i do user validation via https connection using openssl 1.0 library. Application is ...
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6answers
11k views

Trying to make a Django-based site use HTTPS-only, not sure if it's secure?

The EFF recommends using HTTPS everywhere on your site, and I'm sure this site would agree. When I asked a question about using Django to implement HTTPS on my login page, that was certainly the ...
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3answers
243 views

Does checking the fingerprint of a self signed certificate improve security?

I am currently developing a component for an application that does TCP communication with a device inside a local area network. I use TLS to provide data encryption, integration and authorisation. ...
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1answer
71 views

Is it dangerous to sync my data with my personal server through unencrypted http?

Since Apple force iPhone users to use iCloud to sync contacts & calendar, I moved to a local ownCloud instance that works well. However, it would be more convenient if I could sync everywhere and ...
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2answers
74 views

Why do client certificates not protected against improper server certificate validation

I understand the question of client certs and MITM attacks has been asked several times, but I don't believe this specific scenario has been answered. It was my (seemingly incorrect) assumption, that ...
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2answers
132 views

Is there such a thing as a non-expiring SSL certificate?

Is there such a thing as a non-expiring SSL certificate? Our scenario is that we develop and sell embedded devices (think "internet of things"). These devices have little web servers running on them ...
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2answers
467 views

Sniffing From Squid SSL

I created a Squid proxy and a self-signed SSL certificate. The SSL certificate on the server is a private certificate linked to the ssl-bump feature. I am using tshark to dump the SSL traffic, but I ...
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3answers
129 views

What are the MitM implications of a stolen client-side private key?

Many VoIP handsets support client-side SSL authentication for auto-provisioning. Unfortunately, some devices must be programmed with their client-side keys. (Keys generated on low-entropy devices are ...
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1answer
445 views

iOS, Android, and OS X SHA-2 support (in the context of SSL/TLS certificates)

As there is currently a move away from SHA-1 being used as part of TLS, we're examining moving our SSL certificates, used to protected traffic in transit to/from our webservers, to use SHA-2. ...
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2answers
184 views

Actually, isn't it bad to redirect http to https? [duplicate]

I have a two-part question about question #570288 over on ServerFault. Question: Is it bad to redirect http to https? Accepted answer (185 up-votes): [...] Hell no. It's very good. Part 1 ...
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3answers
268 views

Does a TLS interception proxy present the user's browser with the end server's certificate?

I know that TLS (commonly but mistakenly called SSL) interception works by establishing two encrypted tunnels between a client and server, with the interception device (proxy) terminating both tunnels ...
0
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1answer
111 views

HTTPS Proxy Everwhere?

I am configuring a HTTPS proxy, which I want to use for my laptop wherever I go. The idea is that since its encrypted, I should be safe from eavesdroppers, even on open wireless networks. Think of it ...
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2answers
35 views

DHE Verification

I'm just struggling to get my head around this. In certificate signing with static Diffie Hellman the public key and certificate information is sent to the CA who verifies the certificate ...
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2answers
1k views

Hardened SSL ciphers for Nginx as AWS/Cloudfront Custom Origin

Based on recommendations, we recently attempted to harden our Nginx SSL configuration against BEAST/CRIME/BREACH attacks with the following stanza: ssl_prefer_server_ciphers on; ssl_ciphers ...
2
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1answer
85 views

In Same Origin Policy, why are different protocols considered a security violation?

I can understand why content from different domains is considered to be unstrusted for the same origin policy. But, how can be content from diferent protocols from the same site/domain be dangerous? ...
0
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1answer
63 views

How does a CA add www and raw domain names to my cert when my CSR doesn't have them?

I'm in the process of buying an SSL cert, and I'm confused by this part: Many CAs say they'll add www. to your domain, so that e.g. if you buy a single-domain cert app.example.com, they'll also add ...
2
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2answers
227 views

Should login pages be cacheable?

I'm considering the relative benefits/disadvantages of making a login page cacheable. Note that here I'm referring to the page containing the form into which the user enters their username and ...
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1answer
530 views

Does Gibson's fingerprinting service add much additional security?

I just read this post and it proposes a method of storing SSL fingerprints online so that you can double check that your certificates have not been tampered with. But is it really relevant or useful? ...
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2answers
182 views

Man-in-the-middle SSL generation on request possible

I am doing some research on man-in-the-middle focusing on SSL in particular. I have been looking into generating a certificate on request when a client connects and requests a secured page. ...
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2answers
99 views

How can I set up signed downloads?

Scenario I have a web server that authenticates and redirects from HTTP to HTTPS. Clients can then view available "downloads" in their account. I want to be able to sign these download links - as in, ...
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2answers
192 views

Form submissions over HTTPS are not encrypted?

My question is regarding HTTPS form submission. One of our website is using HTTPS, we display the login page to the user via HTTPS protocol. When the form is submitted, if we try to intercept the ...
2
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3answers
203 views

Does it make sense to keep RC4?

I know that the RC4 cipher when used with SSL is vulnerable to certain attacks, which in the worst case scenario could result in authentication tokens being stolen. But RC4 is also recommended as a ...
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2answers
71 views

Internet and Email privacy in an “internet-enemy” country [closed]

Here where I live, it is believed that all the internet traffic goes through the hands of government agencies, and the telecommunication office is actually owned by the government. Given the ...