January Rx/Tx1


December Rx/Tx


RSA Encryption Algorithm

Introduction

RSA is perhaps the most well-known asymmetric cryptographic algorithm. When it was first introduced back in 1977, it revolutionised cryptography. The public-key cryptosystem, developed by creators Ron Rivest, Adi Shamir, and Leonard Adleman, uses prime factorisation to create a trapdoor function that produces both a public and private key known as a key pair. And by creating separate keys for encryption and decryption, this groundbreaking innovation removed the need to secretly and securely share a single secret key to exchange encrypted messages; with wide distribution of the …

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November Rx/Tx


EuroBSDCon 2019 Talks

The presentations from this year's EuroBSDCon held during late September in Lillehammer, Norway are now available on YouTube.

The program lists a number of interesting talks from seasoned OpenBSD developers such as Alexander Bluhm's assay of performance metrics on OpenBSD (cf. test results), and Stefan Sperling sharing the new Game of Trees git tool—more commonly referred to as got. But there are also many other speakers from various backgrounds presenting an assortment of topics ranging from Paul Vixie—the author of cron, and numerous RFCs—discussing DNS over HTTP (DoH) to an exposition on the basics of ZFS by Dan Langille …

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Unix Simplicity vs. Hardware Complexity

On Day 1 of #Unix50, Timothy Roscoe presented an interesting talk concerning the implications of running the brilliantly simple Unix design that was an apt fit on the hardware of yesteryear on the increasingly complex systems of today.

Having spent a career cogitating on operating system design, Tim's recherche description of the dichotomous relationship between the Unix philosophy and modern hardware should prove thought-provoking for anyone involved in systems or even application programming. For as Tim proposes:

Don't ask: how can I get Unix to work on this hardware landscape? Ask: what is the moral equivalent of Unix, for this hardware landscape …
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OpenBSD 6.6 Released Early

OpenBSD's second of its biannual releases came early again this year with the release of OpenBSD 6.6 last week; while this post comes late.

For anyone who isn't yet aware, Theo's announcement came a few days ago on Thursday, October 17 to the relevant mailing lists.

Among the many changes are:

  • sysupgrade(8): an automatic upgrade utility that performs release and snapshot upgrades with one command
  • LibreSSL 3.0.2: a new release of the project's OpenSSL fork
  • sshsig: a minimal signature and verification utility for ssh-keygen(1)
  • OpenSSH 8.1: a new release of the project's ubiquitous ssh protocol implementation …
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October Rx/Tx


50 Years of Unix


However, something else happened that summer which you won’t find in most history books… a Bell Labs researcher named Ken Thompson created the first version of Unix, which turned out to be one of the most important pieces of computer software ever invented.

This year, we celebrate 50 years of Unix! It was the summer of 1969 that Ken Thompson finished what came to be known as Unix over a three week period when his wife took his kid to visit the in-laws for summer. It wouldn't be hyperbole to suggest that what Ken accomplished literally revolutionised computing.

Bell Labs is …

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SerenityOS: A Graphical Unix-like Operating System

If you're even slightly interested in systems programming, a Unix afficionado, or simply appreciative of highly motivated, intelligent, and genuinely good people, and aren't already aware of Andreas Kling, you'll most definitely enjoy subscribing to his YouTube channel. Andreas regularly shares screencasts of his impressively productive hacking sessions where you'll find him hacking on Serenity—a Unix-like operatng system that he's built from the ground up, entirely from scratch—or catch his candid and enlightening commute talks where he answers questions submitted by followers while sharing personal insights and experiences from his life as a programmer who has worked at places like …

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