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today's howtos

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  • Comparing SSH Keys - RSA, DSA, ECDSA, or EdDSA?

    What makes asymmetric encryption powerful is that a private key can be used to derive a paired public key, but not the other way around. This principle is core to public-key authentication. If Alice had used a weak encryption algorithm that could be brute-forced by today’s processing capabilities, a third party could derive Alice’s private key using her public key. Protecting against a threat like this requires careful selection of the right algorithm.

    There are three classes of these algorithms commonly used for asymmetric encryption: RSA, DSA, and elliptic curve based algorithms. To properly evaluate the strength and integrity of each algorithm, it is necessary to understand the mathematics that constitutes the core of each algorithm.

  • How To Install TensorFlow Machine Learning System on Ubuntu Linux

    In advanced mathematics, the word Tensor is a multi-dimensional array, and flow is the operations graph. The TensorFlow machine learning system is an open-source library function tool for machine learning. It is used to create models using data, create graphs with nodes, edges, and multi-dimensional arrays. You can install the TensorFlow machine learning system on Ubuntu without any special hardware. Integrated functions are also available to use Tensorflow with the Anaconda Navigator or Jupyter notebook on a Linux system.

  • Inkscape Tutorial: Chrome Text

    I saw this tutorial a few months ago and thought it was nice. When you get finished, your text should look like polished chrome.

    First, open Inkscape and select a font. My example uses "God of War" stretched to 144 points. The original tutorial used Impact. This probably works better on a thicker, poster-type font, rather than a thin, handwriting-type font, but try whatever you want!

    The original tutorial put each text clone on a separate layer. Layer 1 will be the basic text. After you get it written, select your basic text and choose Path > Linked Offset from the path menu (the paths tool will have to be on). This will create a 'cloned' offset attached to your basic text. Inkscape will locate the clone below the basic shape. After selecting the clone, fill it with pure white and raise it to the top of the stack. I gave it a hairline black stroke, too, but you do what you want. Cut this object and paste it into a new Layer 2 above Layer 1. Create a three dimensional effect by slightly shifting the white object up and to the left.

  • FTP With Double Commander: How-To

    Despite its spartan, old-school GUI, the program is fast and sophisticated. It incorporates a powerful search tool (Alt+F7). It can perform complex tasks, such as copying files from directories which have a certain extension or file size, or have a certain text pattern in them. Double Commander is also highly customizable. Most functions have a keyboard shortcut to increase efficiency and allow you to configure DC the way it suits you best.

    Below is a tutorial on configuring Double Commander for FTP use. In all of the screenshots, I opted to have the FTP activity take place in the left-hand panel.

  • Analog Video Archive Project

    Today, modern DSLR cameras shoot video content as easily as they shoot stills. Video data can be loaded directly into an editor like Kdenlive, or Openshot for final preparation of rendering and viewing. However, not so long ago, shooting video meant also using the available media of the day. Back then, that meant plastic magnetic analog tape. At first for consumers, it came in large VHS cassettes, and then later in smaller forms VHS-C and then 8mm. By the time 8mm was popular, here came Digital Video over the horizon.

    Most people shoot and record memories on still cameras and video cameras. This process has a habit of getting out of control very quickly. In a few short years, folks are left with more than a few issues about how to easily display and save their precious memories for future generations to enjoy.

    Let's first look at the display options. In the past, pictures and photos were either framed and hung up, or they languished in a shoebox until future generations showed an interest in them. Depending on how much effort they want to put into the project, they save some in an album, and either toss the remainder or return them to the shoebox for more time travelling.

    Today, with computers, there's many more ways to display and use still images. With video memories, we have the option to connect the camera to the TV for viewing, or maybe saving the data to a networked drive for later streaming, or up to social media.


    So there I was, believing I was ready to get started capturing memories from the tapes. After doing some research about what software to use, and trying some testing to determine which was best to depend on, I opted for a Linux command line program by the name dvgrab. It's a small application that does what it was designed to do, very well. Dvgrab is in the PCLinuxOS repo and has a powerful set of options to use with the basic command.

  • What is the best file format for web shortcuts

    Links primarily exist on the web, but they can also exist as files in your local file system. There are several formats for storing links as files that open in your web browser. Here’s a quick comparison of the available formats, and a recommendation for which to use for your link files.

    Link files — not to be confused with file system links (“symlinks”) — are plain-text files in a structured format that compatible programs can open. The user profile folder in Windows comes with two default folders for storing such links — Links and Favorites — but they’re just regular files that can be stored anywhere on your file system.

    The different operating systems call these different things; including Internet Shortcuts, Web Location files, and Web Link files. Windows has its .url files; macOS has its .webloc, .webbookmark, and .webhistory files; and Linux has .desktop files. They’re essentially the same thing.

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