Introduction to Intel AES-NI

Mon, 22 Nov 2021 11:01:50 +0800

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This article was originally published on Anquanke: original article

AES-NI is Intel’s x86-64 SIMD extension for accelerating AES. Anyone familiar with SIMD probably knows it exists, but AES’s asymmetric structure and AES-NI’s unusual design require considerable detail and theory to use correctly. Using easyRE from N1CTF 2021 as an example, this article summarizes my understanding; corrections are welcome.

An Introduction to Reversing mruby Bytecode

Mon, 27 Sep 2021 21:17:11 +0800

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This article was originally published on Anquanke: original article

Introduction to mruby

mruby is a lightweight implementation of Ruby. It works much like CPython: Ruby source is compiled to bytecode, which is then interpreted by a virtual machine.

I first encountered mruby bytecode in the DEF CON 2021 Finals. The barb-metal challenge used mruby bytecode to run simulated IoT firmware. A few months later, another mruby reversing challenge appeared in the Fifth Space online competition, so I decided to summarize the characteristics of mruby bytecode.

Programming on Locus Solus | Nagi's Blog

Introduction to Intel AES-NI

An Introduction to Reversing mruby Bytecode

Introduction to mruby