On the Juniper backdoor, by Matthew Green. “[T]he nature of this vulnerability is particularly insidious and generally messed up.”

Christmas is here, and Perl 6 is stable.

Post-quantum key agreement, an introduction to Ring Learn­ing-With-Errors.

Subtleties of the ANSI/ISO C standard (PDF), by Robbert Krebbers and Freek Wiedijk. “[W]e argue that the C standard does not allow Turing complete implementations, and that its evaluation semantics does not preserve typing. Finally, we claim that no strictly conforming programs exist.”

Alternative mathematical notation and its applications in calculus (PDF), bachelor thesis by Jakub Marian. Interesting ideas!

Elementary probability theory in the Eindhoven style (PDF), by Carroll Morgan.

freetserv, an open-source hardware build-it-yourself device to remote-control up to 48 devices via their RS-232 serial port.

Four Columbia House insiders explain the shady math behind “8 CDs for a penny”, longread.

Gingerbread Internet Archive

Endless Jingling

Graph Isomorphism in Quasipolynomial Time, preprint by László Babai.

A practical cryptanalysis of the Telegram messaging protocol (PDF), by Jakob Bjerre Jakobsen.

New Erdős Paper Solves Egyptian Fraction Problem, “One of the authors believes that all rational numbers can be expressed in this form, another author has doubts that every rational number can be expressed in this form, and the third author, already having looked in The BOOK at the answer, remains silent on this issue.”

Ulix (Literate Unix) is a Unix-like operating system that was developed at University of Erlangen-Nuremberg. “We used Donald E. Knuth’s concept of Literate Programming for the implementation and documentation.”

GOWEB, a port of Knuth’s WEB/CWEB to Go.

How I wrote a self-hosting C compiler in 40 days, by Rui Ueyama.

emacs-fireplace, a cozy fireplace for Emacs.

The Free Universal Construction Kit, a set of adapters for complete interoperability between 10 popular construction toys.

If Drake Was Born A Piano, “It’s a terrible and amazing thing to listen to — a conversion of the original MP3 to MIDI, and back again to MP3.”

Digitalcourage Adventskalender

Mathekalender

New ELF Linker from the LLVM Project, “We are happy to announce that it has reached a significant milestone: it is now able to bootstrap LLVM, Clang, and itself and pass all tests on x86-64 Linux and FreeBSD with the speed expected of an LLVM project.”

Project IceStorm aims at reverse engineering and documenting the bitstream format of Lattice iCE40 FPGAs and providing simple tools for analyzing and creating bitstream files.

acme-tiny is a tiny, auditable Python script that you can throw on your server to issue and renew Let’s Encrypt certificates.

letsencrypt.sh, a Let’s Encrypt client implemented as a shell-script.

Let’s Encrypt Stats

HowTo: Fix a Broken Netgear GS108, worked for me.

Raspberry Pi microSD card performance comparison (2015), for future reference.

Kuriositäten-Adventskalender 2015

Advent of Code (my solutions)

Fractal Gears

aibohphobia