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{ Category Archives } Linux

Linux news and information.

Using Your Monitors As A Cryptographically Secure Pseudorandom Number Generator

File this under the "I'm bored and have nothing better to do" category. While coming into work this morning, I was curious if I could use my monitors as a cryptographically secure pseudorandom number generator (CSPRNG). I don't know what use this would have, if any, as your GNU/Linux operating system already ships a CSPRNG […]

Encrypted Account Passwords with Vim and GnuPG

Background I've been a long-time KeepassX user, and to be honest, I don't see that changing any time soon. I currently have my password database on an SSH-accessible server, of which I use kpcli as the main client for accessing the db. I use Keepass2Android with SFTP on my phone to get read-only access to […]

Password Generation in the Shell

No doubt, some people use password generators- not many, but some. Unfortunately, this means relying on 3rd party utilities, where the source code may not always be available. Personally, I would rather be in full control of the entire generation stack. I know how to make sure plenty of entropy is available in the generation, […]

The Kidekin TRNG Hardware Random Number Generator

Yesterday, I received my Kidekin TRNG hardware random number generator. I was eager to purchase this, because on the Tindie website, the first 2 people to purchase the RNG would get $50 off, making the device $30 total. I quickly ordered one. Hilariously enough, I received a letter from the supplier that I was their […]

Additional Testing Of The rtl-sdr Dongle As A HWRNG

A couple days ago, I put up a post about using the Realtek SDR dongles as a hardware true random number generator. I only tested the randomness of a 512 MB file. I thought this time, I would but a bit more stock into it. In this case, I let it run for a while, […]

Hardware RNG Through an rtl-sdr Dongle

An rtl-sdr dongle allows you to receive radio frequency signals to your computer through a software interface. You can listen to Amateur Radio, watch analog television, listen to FM radio broadcasts, and a number of other things. I have a friend to uses it to monitor power usage at his house. However, I have a […]

Reasonable SSH Security For OpenSSH 6.0 Or Later

As many of you have probably seen, Stribik AndrĂ¡s wrote a post titled Secure Secure Shell. It's made the wide rounds across the Internet, and has seen a good, positive discussion about OpenSSH security. It's got people thinking about their personal SSH keys, as well as the differences between ECC and RSA, why the /etc/ssh/moduli […]

Super Size The Strength Of Your OpenSSH Private Keys

In a previous post, about 18 months ago, I blogged about how you can increase the strength of your OpenSSH private keys by using openssl(1) to convert them to PKCS#8 format. However, as of OpenSSH verison 6.5, there is a new private key format for private keys, as well as a new key type. The […]

Using The Bitmessage Storage Service

While hanging out on the "privacy" channel on Bitmessage, someone sent the following: "You have no files saved. For instructions please send a message to BM-2cUqBbiJhTCQsTeocfocNP5WCRcH28saPU with the subject 'help'." This is actually pretty cool. No doubt should you call into question a faceless storage provider, but I thought I would play around with it. […]

Cryptographically Secure Pseudorandom Locally Administered Unicast MAC Addresses

Recently, Apple released the ability for iPhone 5c and newer hardware to create a spoofed software MAC address for 2.4 GHz and 5 GHz wireless access points. The MAC address is locally administered, and a unicast address. This has sparked a small discussion in various forums about how to generate valid locally administered unicast MAC […]

Protect Against Bit Rot With Parchive

Introduction Yes, this post was created on April 1. No, it's not an April Fool's joke. So, I need to begin with post with a story. In 2007, I adopted my daughter, and my wife decided that she wanted to stay home rather than work. In 2008, she quit her job. She was running a […]

ZFS Administration, Appendix D- The True Cost Of Deduplication

This post gets filed under the "budget and planning" part of systems administration. When planning out your ZFS storage pool, you will need to make decision about space efficiency, and the cost required to build out that architecture. We've heard over and over that ZFS block deduplication is expensive, and I've even mentioned it on […]

ZFS Administration, Appendix C- Why You Should Use ECC RAM

Introduction With the proliferation of ZFS into FreeBSD, Linux, FreeNAS, Illumos, and many other operating systems, and with the introduction of OpenZFS to unify all the projects under one collective whole, more and more people are beginning to tinker with ZFS in many different situations. Some install it on their main production servers, others install […]

Real Life NTP

I've been spending a good amount of my spare time recently configuring NTP, reading the documentation, setting up both a stratum 1 and stratum 2 NTP server, and in general, just playing around with NTP. This post is meant to be a set of notes of what I've learned in the process, and hopefully, it […]

Open Letter To All GNU/Linux and Unix Operating System Vendors

This is an open letter to all GNU/Linux and Unix operating system vendors. Please provide some sort of RSS or Atom feed for just new releases. Nothing else. No package updates. No "community" posts. No extra fluff. It shouldn't include news about being included in the Google Summer of Code. It shouldn't provide a list […]