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today's leftovers

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  • random: use BLAKE2s instead of SHA1 in extraction

    This commit addresses one of the lower hanging fruits of the RNG: its usage of SHA1.

    BLAKE2s is generally faster, and certainly more secure, than SHA1, which has [1] been [2] really [3] very [4] broken [5]. Additionally, the current construction in the RNG doesn't use the full SHA1 function, as specified, and allows overwriting the IV with RDRAND output in an undocumented way, even in the case when RDRAND isn't set to "trusted", which means potential malicious IV choices. And its short length means that keeping only half of it secret when feeding back into the mixer gives us only 2^80 bits of forward secrecy. In other words, not only is the choice of hash function dated, but the use of it isn't really great either.

  • TK Backgrounder

    Tk is a user interface toolkit that makes it easy to build desktop graphical user interfaces. Tk is cross-platform, meaning the same code can be made to run the same on Windows, Mac OS X, or X11 under a huge range of Unix systems (e.g. Linux). Compared with most user interface toolkits, Tk is also quite high level, meaning that it takes care of a lot of details for you. Tk is also unique in that it was designed from the start to be paired with a high level dynamic programming language (like Python, Tcl, Ruby, and Perl) as opposed to lower-level languages like C or C++. In fact, you'll find a Tk binding for most dynamic languages available today. It also is BSD-licensed, making it attractive for both open source and commercial developers.

    Taken together, these factors make Tk an attractive option for people trying to develop a GUI on Windows, Mac or Unix, especially if they want it to run on all three. And because Tk is used from dynamic programming languages, it's an accessible tool not only for hardcore developers, but also many people without a computer science or engineering background.

    Because it's been around for a very long time, and changed a lot over the years, there's a lot of horridly outdated and therefore incorrect information out there. This makes extracting the truth pretty overwhelming if you just want to figure out if and how to use Tk today. While that's mostly what this site will help with, a brief history of where it came from, why and how it caught on, and how things have evolved until today will help put a whole lot of things in context.

  • When a web PKI certificate won't cut it

    In recent years, setting up a public HTTPS website has gotten easier and easier, thanks to widespread automated certificate management, free certificates, inexpensive CDN support, and other developments. However, for the most part, these advancements – and the web PKI in general – are designed for publicly accessible websites. That is, a website with a publicly resolvable domain name can undergo domain name validation to get an HTTPS certificate. You can also get an HTTPS certificate for a public IP address, but this type of certificate is much more rare and less widely supported than certificates for public domain names. What you cannot do is get a publicly trusted HTTPS certificate for a non-public domain name (such as an intranet hostname) or a reserved private network or localhost IP address (such as That is, a certificate authority like Let’s Encrypt or DigiCert will not be able to provide you with an HTTPS certificate for foo.test or that works with an out-of-the-box client like a major web browser. This is because there’s no way for the certificate authority to validate that you are the true owner of such a name; by definition, there is no such concept of the true owner of such a name.

More in Tux Machines

digiKam 7.7.0 is released

After three months of active maintenance and another bug triage, the digiKam team is proud to present version 7.7.0 of its open source digital photo manager. See below the list of most important features coming with this release. Read more

Dilution and Misuse of the "Linux" Brand

Samsung, Red Hat to Work on Linux Drivers for Future Tech

The metaverse is expected to uproot system design as we know it, and Samsung is one of many hardware vendors re-imagining data center infrastructure in preparation for a parallel 3D world. Samsung is working on new memory technologies that provide faster bandwidth inside hardware for data to travel between CPUs, storage and other computing resources. The company also announced it was partnering with Red Hat to ensure these technologies have Linux compatibility. Read more

today's howtos

  • How to install go1.19beta on Ubuntu 22.04 – NextGenTips

    In this tutorial, we are going to explore how to install go on Ubuntu 22.04 Golang is an open-source programming language that is easy to learn and use. It is built-in concurrency and has a robust standard library. It is reliable, builds fast, and efficient software that scales fast. Its concurrency mechanisms make it easy to write programs that get the most out of multicore and networked machines, while its novel-type systems enable flexible and modular program constructions. Go compiles quickly to machine code and has the convenience of garbage collection and the power of run-time reflection. In this guide, we are going to learn how to install golang 1.19beta on Ubuntu 22.04. Go 1.19beta1 is not yet released. There is so much work in progress with all the documentation.

  • molecule test: failed to connect to bus in systemd container - openQA bites

    Ansible Molecule is a project to help you test your ansible roles. I’m using molecule for automatically testing the ansible roles of geekoops.

  • How To Install MongoDB on AlmaLinux 9 - idroot

    In this tutorial, we will show you how to install MongoDB on AlmaLinux 9. For those of you who didn’t know, MongoDB is a high-performance, highly scalable document-oriented NoSQL database. Unlike in SQL databases where data is stored in rows and columns inside tables, in MongoDB, data is structured in JSON-like format inside records which are referred to as documents. The open-source attribute of MongoDB as a database software makes it an ideal candidate for almost any database-related project. This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you the step-by-step installation of the MongoDB NoSQL database on AlmaLinux 9. You can follow the same instructions for CentOS and Rocky Linux.

  • An introduction (and how-to) to Plugin Loader for the Steam Deck. - Invidious
  • Self-host a Ghost Blog With Traefik

    Ghost is a very popular open-source content management system. Started as an alternative to WordPress and it went on to become an alternative to Substack by focusing on membership and newsletter. The creators of Ghost offer managed Pro hosting but it may not fit everyone's budget. Alternatively, you can self-host it on your own cloud servers. On Linux handbook, we already have a guide on deploying Ghost with Docker in a reverse proxy setup. Instead of Ngnix reverse proxy, you can also use another software called Traefik with Docker. It is a popular open-source cloud-native application proxy, API Gateway, Edge-router, and more. I use Traefik to secure my websites using an SSL certificate obtained from Let's Encrypt. Once deployed, Traefik can automatically manage your certificates and their renewals. In this tutorial, I'll share the necessary steps for deploying a Ghost blog with Docker and Traefik.