Felix Crux

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FreeBSD Security Officer Colin Percival's list of recommendations for using cryptography which, if followed, will make sure you get things right in the vast majority of situations.

This is an open set of lecture notes on metaheuristics algorithms, intended for undergraduate students, practitioners, programmers, and other non-experts. It was developed as a series of lecture notes for an undergraduate course taught at GMU. The chapters are designed to be printable separately if necessary. As it's lecture notes, the topics are short and light on examples and theory. It's best when complementing other texts.

A collection of explanations of common economic fallacies that appear all too often in public discourse and the media.

This game represents the untyped lambda calculus. A hungry alligator is a lambda abstraction, an old alligator is parentheses, and eggs are variables. The eating rule corresponds to beta-reduction. The color rule corresponds to (over-cautious) alpha-conversion. The old age rule says that if a pair of parentheses contains a single term, the parentheses can be removed.

The ubiquity of frustrating, unhelpful software interfaces has motivated decades of research into “Human-Computer Interaction.” In this paper, I suggest that the long-standing focus on “interaction” may be misguided. For a majority subset of software, called “information software,” I argue that interactivity is actually a curse for users and a crutch for designers, and users’ goals can be better satisfied through other means.

Hey! Socket programming got you down? Is this stuff just a little too difficult to figure out from the man pages? You want to do cool Internet programming, but you don't have time to wade through a gob of structs trying to figure out if you have to call bind() before you connect(), etc., etc. Well, guess what! I've already done this nasty business, and I'm dying to share the information with everyone! You've come to the right place. This document should give the average competent C programmer the edge s/he needs to get a grip on this networking noise. And check it out: I've finally caught up with the future (just in the nick of time, too!) and have updated the Guide for IPv6! Enjoy!

Raphaël is a small JavaScript library that should simplify your work with vector graphics on the web. If you want to create your own specific chart or image crop and rotate widget, for example, you can achieve it simply and easily with this library. Raphaël uses the SVG W3C Recommendation and VML (mostly equivalent Internet Explorer implementation) as a base for creating graphics. This means every graphical object you create is also a DOM object, so you can attach JavaScript event handlers or modify them later. Raphaël’s goal is to provide an adapter that will make drawing vector art (similar to Flash) compatible cross-browser and easy. Raphaël currently supports Firefox 3.0+, Safari 3.0+, Opera 9.5+ and Internet Explorer 6.0+.

Replicating important services on multiple processors in a distributed architecture is a common technique for constructing dependable computing systems. This paper describes a communication substrate, called Consul, that facilitates the development of such systems by providing a collection of fundamental abstractions for constructing fault-tolerant programs based on replicated processing. These abstractions include a multicast service, a membership service, and a recovery service. Consul is unique in two respects. First, its services are implemented using a collection of algorithms that exploit the partial (or causal) ordering of messages exchanged in the system. Such algorithms are generally more efficient than those that depend on a total ordering of events. Second, its underlying architecture is configurable, thereby allowing a system to be structured according to the needs of the application. The paper sketches Consul's architecture, presents the algorithms used by its protocols, and reports on the performance of an implementation using the x-kernel.

The goal of this article is to provide a fairly comprehensive introduction to the Clojure programming language. A large number of features are covered, each in a fairly brief manner.

A book on the design and implementation of programming languages, taught with a refreshingly accessible and practical approach. Surveys major language paradigms and implementation choices, and leads the reader through hands-on implementation exercises.

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