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Back to C++
I learned C++ in the late 1990s, back then with Microsoft's Visual Studio C++ and the Microsoft Foundation Classes. When I left Windows behind and embraced Linux and macOS, I concentrated on Objective-C, Vala, and (since 2020, being late to the game) Swift. Just recently I started getting into MCU programming (notably the ESP32-series). As I'm (still) not very fond of C, I was pleasantly surprised to see that C++ was supported well. I didn't look at C++ for almost two decades, but I like what the committee did since 2014. Type inference, move semantics, coroutines, ranges, and all that...
Building a Hacker News ChatGPT Plugin
I recently received access to develop and use ChatGPT plugins, and embarked on a project to build a Hacker News integration as a learning exercise. My goal was to enable retrieval of content from HN to answer questions and produce insights in conversations with ChatGPT.
You can experience the plugin in one of three ways:
Check out the simple demo which approximates parts of the plugin. (or) add ‘hn.kix.in’ as a plugin — if you have ChatGPT plugin access. (or) watch this short video:Simple Demo ...
Fine-tuning with LoRA: create your own avatars & styles!
Remember Magic Avatars in the Lensa app that were all the rage a few months ago? The custom AI generated avatars from just a few photos of your face were a huge hit!
Reference portrait image of me
One of my Lensa “Magic Avatars”
The technology behind this product is the open source Stable Diffusion image generation model. You can run this model on your own computer, on a cloud GPU instance, or even a free colab notebook — to generate your own avatars. In this post...
Quick guide to installing Stable Diffusion
In my last post “AI primer: Image Models 101”, I recommended Midjourney and Stable Diffusion as my top two choices. If your goal is to make beautiful images and art, Midjourney is the best choice, as they have a very easy to use service and can produce high quality output with minimal effort.
However, if you are a hobbyist and tinkerer, or just want to invest a bit of time to go deeper in this space, Stable Diffusion is a great choice. It’s a bit more involved to set up, but has several advantages:
It is one of the few...AI Primer: Image Models 101
It’s spring of 2023, and if you aren’t paying attention to what’s happening in the world of AI, you really should. The world is about to change in big ways!
I’ll save the general discussion on AI for another post — I’m hoping for this article to be one of a multipart series where we dive into the practical aspects of each major area of advancement. My goal is to give readers a taste of what’s going on, what the capabilities of these AI models are, and why you should care.
Let’s start with image generation models, as they’re the oldest in...
Redesign of Tox’s Cryptographic Handshake
In 2017, Jason A. Donenfeld (known for WireGuard®) reported an issue in Tox’s handshake [1]. This issue is called “Key Compromise Impersonation” (KCI). I will try to explain the issue as simple as possible:
In Tox you don’t register an account (e.g. with username and password), but instead your identity is solely based on (asymmetric) cryptographic information, a so-called asymmetric key pair. Such a key pair consists of a public part (public key) and a private part (private key). The public part, as the naming suggests, is public and contained in your ToxID which you share with your contacts to be...