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Quantum Cryptography

LinuxJournal - Tue, 2014, Apr22 - 10:32

Classical cryptography provides security based on unproven mathematical assumptions and depends on the technology available to an eavesdropper. But, these things might not be enough in the near future to guarantee cyber security. We need something that provides unconditional security. We need quantum cryptography. more>>

Command-Line Cloud: gcalcli

LinuxJournal - Mon, 2014, Apr21 - 11:12

If you follow my columns in Linux Journal, you probably are aware that I'm a big fan of the command line. When it comes to getting things done efficiently, most of the time the command line can't be beat. more>>

Image Manipulation with ImageMagick

LinuxJournal - Thu, 2014, Apr17 - 10:46

I've spent a lot of time in my column talking about text processing and analysis, with the basic assumption that if you're using the command line, you're focused on text. more>>

Non-Linux FOSS: Angry IP

LinuxJournal - Wed, 2014, Apr16 - 14:12

The de facto standard for port scanning always has been the venerable Nmap program. The command-line tool is indeed very powerful, but I've only ever seen it work with Linux, and every time I use it, I need to read the man page to figure out the command flags. more>>

Installing and configuring owncloud

AZ Loco - Tue, 2014, Apr15 - 20:18

Todd and I spent a morning installing and configuring owncloud on the team server. Things worked fairly well - with essentially only one glitch that I'll discuss at the end.

owncloud was installed on a new virtual machine with Ubuntu server 12.04.3 as the initial install. Immediately after the install from an ISO image, the server was updated with the latest updates.

A web search suggested that there are only install packages for OpenSuse. Later on (more by accident) we found out that Ubuntu has an owncloud package, but we didn't use that.

The instructions we followed were these:
http://doc.owncloud.org/server/6.0/admin_manual/installation/installatio...
We did put the whole owncloud content directly into /var/www. That worked for us, because the server is dedicated to the owncloud service.

Also - make sure that ssl is running.

At that point we were able to get to the opencloud server from within the local network via Firefox.

Getting to the opencloud from the Internet was done by re-directing port 8081 from tempe.from-az.net to the firewall behind which all AzLoco servers sit. The firewall then does forward the request to the https port of the owncloud server.

We encountered two glitches:
Glitch1: The admin page had a line indicating that the WebDAV configuration was broken. After some investigation it was clear that the problem was introduced by our ssl certificate. Owncloud tries to check the WebDAV functionality with Curl. Curl finds it problematic that the server's certificate's DN does not match the URL under which the owncloud server is accessed.
This problem got fixed by editing the file /var/www/3rdparty/Sabre/DAV/Client.php. These two lines had to be added to the initialization of the array $curlSettings in function request:

CURLOPT_SSL_VERIFYPEER => 0,
CURLOPT_SSL_VERIFYHOST => 0,

Glitch2:
after login, the owncloud server was directing to its IP address on the local network, rather than to tempe.from-az.us. The fix for this was to edit the file /var/www/config/config.php. This line had to be added to the initialization of the array $CONFIG

'overwritehost' => 'tempe.from-az.net:8081',

We didn't attempt to get CA endorsed certificates, because the intent of this owncloud use is for team members, so overriding the certificate trust on the browser is acceptable. To make the Chrome browser work correctly the DN of the certificate had to be tempe.from-az.us

Tags: Arizona TeamArizona Team Projects
Categories: Sponsor News Feeds

Installing and configuring owncloud

AZ Loco - Tue, 2014, Apr15 - 20:18

Todd and I spent a morning installing and configuring owncloud on the team server. Things worked fairly well - with essentially only one glitch that I'll discuss at the end.

owncloud was installed on a new virtual machine with Ubuntu server 12.04.3 as the initial install. Immediately after the install from an ISO image, the server was updated with the latest updates.

A web search suggested that there are only install packages for OpenSuse. Later on (more by accident) we found out that Ubuntu has an owncloud package, but we didn't use that.

The instructions we followed were these:
http://doc.owncloud.org/server/6.0/admin_manual/installation/installatio...
We did put the whole owncloud content directly into /var/www. That worked for us, because the server is dedicated to the owncloud service.

Also - make sure that ssl is running.

At that point we were able to get to the opencloud server from within the local network via Firefox.

Getting to the opencloud from the Internet was done by re-directing port 8081 from tempe.from-az.net to the firewall behind which all AzLoco servers sit. The firewall then does forward the request to the https port of the owncloud server.

The main glitch that needed a bit of sleuthing was this:
When going into the admin of the owncloud server (through the web interface), there was a message that WebDAV was misconfigured. In the end it turns out that owncloud uses CURL to test if the WebDAV works. CURL gets tripped-up on the fact that the certificate being used by apache used a fully qualified domain name that was different than what was in the web request URL. Once the certificate was re-created with the fully qualified domain name matching the host in the request URL, webDAV worked fine.

We didn't attempt to get CA endorsed certificates, because the intent of this owncloud use is for team members, so overriding the certificate trust on the browser is acceptable.

Tags: Arizona TeamArizona Team Projects
Categories: Sponsor News Feeds

Encrypting Your Cat Photos

LinuxJournal - Tue, 2014, Apr15 - 12:28

The truth is, I really don't have anything on my hard drive that I would be upset over someone seeing. I have some cat photos. I have a few text files with ideas for future books and/or short stories, and a couple half-written starts to NaNoWriMo novels. It would be easy to say that there's no point encrypting my hard drive, because I have nothing to hide. more>>

Heartbleed for the desktop

PLUG Chairman Blog - Mon, 2014, Apr14 - 03:03

Heartbleed is a recently discovered security flaw that affects millions of web servers.

Heartbleed affects enough servers that you should just change all your web site passwords. It allows theft of the server's security key, your credentials, your session with the web site and cookies that can be used to impersonate you.

Because the security certificates could be stolen, there are some extra steps.

read more

Categories: Sponsor News Feeds

Heartbleed for the desktop

LuftHans - Mon, 2014, Apr14 - 03:03

Heartbleed is a recently discovered security flaw that affects millions of web servers.

Heartbleed affects enough servers that you should just change all your web site passwords. It allows theft of the server's security key, your credentials, your session with the web site and cookies that can be used to impersonate you.

Because the security certificates could be stolen, there are some extra steps.

read more

Numerical Python

LinuxJournal - Fri, 2014, Apr11 - 11:25

For the past few months, I've been covering different software packages for scientific computations. For my next several articles, I'm going to be focusing on using Python to come up with your own algorithms for your scientific problems. more>>

Speed Test for Nerds

LinuxJournal - Thu, 2014, Apr10 - 12:46

Most people with Internet access in their houses have visited a speed-test Web site to make sure they're getting somewhere close to the speed they're overpaying for. I'm paying more than $100 a month for my business-class connection from Charter, so on a regular basis, I make sure I'm getting the advertised speed. more>>

DNSSEC Part II: the Implementation

LinuxJournal - Tue, 2014, Apr08 - 14:11

This article is the second in a series on DNSSEC. In the first one, I gave a general overview of DNSSEC concepts to lay the foundation for this article, which discusses how to enable DNSSEC for a zone using BIND. more>>

Pro Video Editing with Pitivi

LinuxJournal - Mon, 2014, Apr07 - 11:00

Several decent video editors are available on the Linux platform. Kdenlive, OpenShot, Cinelerra and Pitivi are those that come to mind as "big players" in an admittedly small market. I've used them all through the years, with varying levels of success. more>>

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