Setting up passwordless SSH is a simple two step process. This guide will walk you through doing it with OpenSSH and PuTTY. Although PuTTY is available for UNIX like operating systems, I am going to assume you are using it on a Windows computer. Here are the two steps: Create a private key on the… Read More »
This guide assumes familiarity with UNIX like operating systems, X.500, LDAP and OpenLDAP. The Directory Backups section of the OpenLDAP 2.4 Administrator’s Guide, as of September 28, 2016, doesn’t have any kind of restoration procedures. This guide will help you do it. Backup OpenLDAP There are two methods for backing up OpenLDAP. One is to… Read More »
This guide will show you how to create a self-signed certificate with various tools. Quick Reference OpenSSL With New RSA Key openssl req -days 500 -newkey rsa:4096 -keyout privkey.pem -nodes -sha256 -x509 -out cert.pem With Existing RSA Key openssl req -days 500 -key privkey.pem -nodes -sha256 -x509 -out cert.pem Option Required What It Does req… Read More »
In computing, you will come across various numbering systems such as binary and hexadecimal. These systems are known as positional notation, but with different bases. This guide will explain positional notation and show you how to convert from one system, such as hexadecimal, to another. Positional Notation You probably learned this in elementary school, but… Read More »
Passwords are used for banking, work, school, social media, message boards, email, and more. That is a lot of passwords to keep track of. Most of you have probably heard the advice to use pass phrases or long and complex passwords, even with secret questions. This is hard to do when you have dozens of… Read More »
When you start seeing terms such as octal, binary, sticky bits, set UID, set GID, and ACLs, learning how UNIX file permissions work may sound confusing. Its not so bad after a bit of practice. In my opinion, it is easier than Windows permissions. You don’t need to understand octal and binary. It could possibly… Read More »
I am quite fond of FreeBSD. It has several nice features that I find very useful. This review will be most useful to people who are already familiar with UNIX like operating systems, but those that aren’t may still find it useful. It assumes readers understand basic systems administration. Here is a short list of… Read More »
This how-to assumes basic familiarity with the Linux distribution of choice and basic IPv4 networking. It assumes the operating system is installed. Steps for (Red Hat Enterprise Linux) RHEL 7 based, RHEL 6 based, and Debian based distributions are included. If there are requests for other distributions, post a comment or use the contact page.… Read More »
This vi tutorial should teach you just enough to do some basic editing and understand the documentation. I have tested it with vim and the version of nvi that ships with FreeBSD. It should work with any version. Vi is a popular text editor for UNIX like operating systems created in 1976. Unlike most word… Read More »
This overview’s target audience is those without a math or computer science background. It should leave you with a basic understanding of some of the basics of what cryptography is all about. This is barely scratching the surface of the topics mentioned. There are some links at the bottom of the page for those wishing… Read More »