How to remove the passphrase on a private key

To remove a passphrase on a private key, simple execute this command. openssl rsa -in server.key -out server.unprotected.key Since it is a private key, make sure that it is well

Read More

Creating a certificate for a server

Creating a server certificate involves only a few steps. To do so, execute the following commands. This post assumes that “OpenSSL initial configuration” and “Creating a ca’s self signed certificate”

Read More

Creating a ca’s self signed certificate

In order to create your own certificates, you need a CA (certificate authority) certificate. This certificate will be used to sign every certificate you will create. To do so, execute

Read More

Tomcat and MySQL benchmarks

Benkmarks made using a Tomcat and a MySQL database. These figures are provided to give you an idea of the performance you should expect. The tests were done in the

Read More

OpenSSL initial configuration

This initial configuration procedure assumes that you are executing it on Linux Create a special user named ‘ca’. Its home directory will hold the data. It must protected carefully. For

Read More

How to change the signature of a disk

To change the signature of a disk under Windows 7, follow these steps are: Run the command line utility diskpart as the administrator user Execute the command “list disk” to locate

Read More

Installation of the AVR toolchain on Ubuntu to develop for the Arduino Platform

Install Eclipse using “Ubuntu Software Center” Install the AVR Eclipse Plugin using Help >> Install New Software. The source link is http://avr-eclipse.sourceforge.net/updatesite/ Install the gcc toolchain apt-get install avrdude binutils-avr

Read More

SSH login without password

It is possible to securely connect to a SSH server without a password. To do so, you must perform the following steps. It assumes that both machine are running a

Read More

How to create a SSH tunnel

You can connect to a remote host [remote-host] using another machine [proxy-host]. This can be accomplished if the [proxy-host] as an SSH server running. To do so, logon to the

Read More

How to replace LibreOffice by OpenOffice in Ubuntu 11

If you prefer using OpenOffice than LibreOffice in Ubuntu 11, you can replace it using these few steps: Download OpenOffice from http://download.openoffice.org/other.html. Download either Linux Intel DEB or Linux x86-64 DEB depending

Read More

Unix History

I can bet that you have no idea what the Unix timeline looks like. Curious? Download this PDF file from www.levenez.com.

Read More

USB Flash Drives comparison

Manufacturer Model Capacity Read speed(MB/s) Write speed(MB/s) Patriot Xporter XT Rage 32 GB 27 25 Corsair Voyager GTR 32 GB 34 28 Lexar Echo MX 32 GB 30 17 Kingston

Read More

Very slow connection to a SSH server

A problem with the DNS configuration on a server can cause the login to the ssh server very slow. I can be fixed by adding the following line UseDNS no

Read More

Exchange large files for free

When it is time to transfer files, e-mail has its limitation. Most of the time, e-mail size is limited to 5 megabytes or so. The site FileConvoy lets you share

Read More

Arduino Ethernet Shield example WebServer.pde no longer works after upgrading Ubuntu to version 11.10

This patch must be applied to w5100.h located into library/Ethernet/utility. — w5100.h.orig 2011-10-03 13:43:10.536833701 +0200 +++ w5100.h 2011-10-03 13:47:26.764844567 +0200 @@ -258,7 +258,10 @@ } \ static uint16_t read##name(SOCKET _s)

Read More