Reverse-Engineering on Karpoke - Just Another Blog

CPC Analyser

Mon, 24 Jul 2023 08:47:22 +0100

Acaba de ser publicada la primera versión de esta interesante herramienta: CPC Analyzer es una conversión de Spectrum Analyzer, se trata de una utilidad para

» AUA | auamstrad.es

Enlaces Recomendados de la Semana (N°620)

Tue, 15 Jun 2021 18:59:56 +0100

Basura electrónica, ingeniería inversa, la batalla a muerte entre dos mamuts y el Incidente Laconia sirven de aperitivo de una edición de los Enlaces Recomendados de la Semana que tiene todo eso y mucho más, incluyendo videitos virales y galerías geniales. ¡Que lo disfrutes!

» neoteo.com | neoteo.com

How I cut GTA Online loading times by 70%

Fri, 12 Mar 2021 17:05:36 +0100

Interesting read on how GTA Online player t0st got elbow deep into disassembling GTA Online to fix its poor loading times. After taking a minute to load the common resources used for both story and online modes (which is near on par with high-end PCs) GTA decides to max out a…

» Posted by | bram.us

Desensamblado del microcódigo del Intel 8086 [ENG]

Sun, 06 Sep 2020 09:44:22 +0100

Desensamblado del microcódigo del Intel 8086 [ENG]

» reenigne.org | reenigne.org

Fixing E.T. The Extra-Terrestrial for the Atari 2600

Sat, 24 Sep 2016 17:03:00 +0100

If you’re reading this page, chances are that you’re already well aware that E.T. for the Atari 2600 is one of the most reviled games ever made. I never understood why. As a child, it was one of my favorite games. I still think it’s a good game. Apparently, I’m not alone.

On this page I’m going to briefly explore why people hate E.T., and how the game can be fixed.

Meterpretear una apk

Sun, 14 Aug 2016 12:49:00 +0100

Primero digamos que en este post vamos a tocar los temas de las APKs de Android, que es el formato utilizado para empaquetar las aplicaciones. También vamos a tocar Metasploit, una gran herramienta para los pentesters, esta herramienta se basa en módulos los cuales permiten hacer (sobre todo intentos) de explotación de sistemas, con los módulos de exploit que cuenta la herramienta, o módulos auxiliares. Usaremos dos de las herramientas con las que cuenta metasploit: msfvenom (para generar payloads, dando la posibilidad de pasarlos por un encoder) y msfconsole (consola de comandos para hacer uso de exploits, modulos auxiliares…). Vamos a realizar un sencillo proceso de Ingeniería inversa en android, pero bastante sencillo.

Así es como la ingeniería inversa cambió la historia de la informática para siempre

Mon, 13 Jun 2016 13:58:00 +0100

IBM era el dueño y señor de los bits y los bytes a principios de los 80. En aquella época Apple, Microsoft y los fabricantes de aquellos legendarios ordenadores de 8 bits también despuntaban, pero todo daba igual: el gigante azul dominaba con mano firme la informática empresarial, y para muestra un botón: el PC no se llamaba PC. Se llamaba IBM PC.

» Javier Pastor | xataka.com

Extracting the SuperFish certificate

Mon, 23 Feb 2015 22:56:00 +0100

I extracted the certificate from the SuperFish adware and cracked the password (”komodia”) that encrypted it. I discuss how down below. The consequence is that I can intercept the encrypted communications of SuperFish’s victims (people with Lenovo laptops) while hanging out near them at a cafe wifi hotspot. Note: this is probably trafficking in illegal access devices under the proposed revisions to the CFAA, so get it now before they change the law.

Prince of persia code review

Sat, 15 Jun 2013 23:06:00 +0100

Even though it is the Apple II version written in 6502 assembly language, it was a pleasant experience to dive in the code of that mythical game: As usual there were many fascinating sofware wizardries to discover.

The Apple II apparent poor environment for game programming was actually ground to unmatched innovation and creativity : From self-modifying code, in-house bootloader, clever floppy disc format to skewing lookup tables: Prince Of Persia features engineering treasures in every modules.

BIOS Based Rootkits

Fri, 14 Jun 2013 23:06:00 +0100

Everything described here is based on a project I completed in early 2011, which was originally started several years earlier. While attending CanSecWest in 2009, Anibal Sacco and Alfredo Ortega from Core Security did a presentation on ’Persistent BIOS Infection’ where they demonstrated how it was possible to patch the BIOS to do some nasty/awesome things. Their Phrack write-up is here: http://www.phrack.com/issues.html?issue=66&id=7. At the time this seemed really cool, but I never ended up getting the chance to try it out. A year later I needed to do a term project for school, so I decided to revisit BIOS hacking, and implement some of it myself.

First Glimpse into the Soul of a Tamagotchi

Sat, 08 Jun 2013 23:06:00 +0100

I dumped the ROM of a Tamagotchi using the code execution ability I posted previously. I wrote 6502 code that dumped each byte of the memory space of the Tamagotchi, and output it over port A (which is usually the Tamagotchi button input) via SPI.

» Natalie Silvanovich | kwartzlab.ca

The 8085’s register file reverse engineered

Sun, 31 Mar 2013 20:28:00 +0100

On the surface, a microprocessor’s registers seem like simple storage, but not in the 8085 microprocessor. Reverse-engineering the 8085 reveals many interesting tricks that make the registers fast and compact. The picture below shows that the registers and associated control circuitry occupy a large fraction of the chip, so efficiency is important. Each bit is implemented with a surprisingly compact circuit. The instruction set is designed to make register accesses efficient. An indirection trick allows quick register exchanges. Many register operations use the unexpected but efficient data path of going through the ALU.

How High Can You Get?

Wed, 20 Mar 2013 01:21:00 +0100

So I wanted to find out: what exactly is the bug in the program that causes this behavior and also, can it be fixed?

First I looked on the Internet to see if the answer has already been found. Some good starting information is located at http://www.jeffsromhack.com/products/donkeykong_tech.htm. There, Jeff Kulczycki breaks down the math of the kill screen, showing the formula that is used to compute the bonus for each level. The formula says the level times 10, plus 40, gives the number of hundreds in the bonus timer. If the result is too large it is forced back down. The key to this is that the level number is used in the calculation. On level 22 an overflow occurs, leaving the player with just 400 points on the timer because the multiplication and addition yields a number larger than 256.

An open letter from bunnie, author of Hacking the Xbox

Fri, 15 Mar 2013 02:06:00 +0100

No Starch Press and I have decided to release this free ebook version of Hacking the Xbox in honor of Aaron Swartz. As you read this book, I hope that you’ll be reminded of how important freedom is to the hacking community and that you’ll be inclined to support the causes that Aaron believed in.

I agreed to release this book for free in part because Aaron’s treatment by MIT is not unfamiliar to me. In this book, you will find the story of when I was an MIT graduate student, extracting security keys from the original Microsoft Xbox. You’ll also read about the crushing disappointment of receiving a letter from MIT legal repudiating any association with my work, effectively leaving me on my own to face Microsoft.

Hacking my vagina

Sat, 15 Dec 2012 16:06:00 +0100

This project has been an astonishing little journey. Many of my previous projects were characterized by an amazing outpouring of effort to build something highly intricate and ultimately invisible. This is the opposite kind of project. A little bit of work and a little custom design to create something new and exciting that I can immediately use in my everyday life. It also happens to be a sex toy. In other words, I wanted to hack something I actually use: my vagina.