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_layouts/allposts.html
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<!DOCTYPE html>
<!DOCTYPE html>
<!--
Forty by HTML5 UP
html5up.net | @ajlkn
@ -20,14 +20,18 @@
<section id="one">
<div class="inner">
{% for post in site.posts %}
{% if post.title != 404 %}
<header class="major">
<h1>{{ post.title }}</h1>
</header>
{% if post.image %}<span class="image main"><img src="{{ site.baseurl }}/{{ post.image }}" alt="" /></span>{% endif %}
{% if post.date %}<p>{{ post.date }}</p>{% endif %}
<p>{{ post.content }}</p>
{% endif %}
{% if post.title != 404 %}
<header class="major">
<h1><a href="{{ post.url | relative_url }}" class="link">{{ post.title }}</a></h1>
</header>
<!-- Cheaty way to display a description -->
<h3>&nbsp;&nbsp;&nbsp;&nbsp;{{ post.description }}</h3>
<hr>
<!-- {% if post.image %}<span class="image main"><img src="{{ site.baseurl }}/{{ post.image }}" alt="" /></span>{% endif %}
{% if post.date %}<p>{{ post.date }}</p>{% endif %}
<p>{{ post.content }}</p> -->
{% endif %}
{% endfor %}
</div>
</section>

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---
layout: post
title: "I gave Google's CTF a short try and learned a thing or two"
description: "But exams got in the way and took all the fun"
date: 2019-06-23 22:04:00
categories: ctf
---
Honestly, I completely forgot that this was the weekend of Google's online [CTF Qualifications](https://g.co/ctf) for 2019 and was late, unprepared, busy, and did not have a team to work with.
## What is this event?
Google hosts a (yearly?) event where hackers from around the world team up and attempt a variety of tasks like: exploiting machines over a network, reversing firmware, pulling passwords from tcp packets, hacking crypto stuff (something I suck at), breaking compilers. and much more. Generally, this event and others like it are really fun.
## What I learned
Many questions I worked on involved extracting a key from a binary. I employed two vastly different tools for this job. First, a standard linux tool, `strings`. When passed a filename, it will extract and print all human-readable strings it can find to the terminal. The flag is usually in this dump. If not, I use the second tool. [Ghidra](https://www.nsa.gov/resources/everyone/ghidra/), an open-source reverse engineering tool designed by the NSA. I used this tool a fair amount during my quick attempt at GCTF.
## Will I do this again?
Yes! The CTF was very fun to try, and I will definitely give it a proper shot next time.

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_site/all_posts.html
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<!DOCTYPE html>
<!DOCTYPE html>
<!--
Forty by HTML5 UP
html5up.net | @ajlkn
@ -77,13 +77,40 @@
<section id="one">
<div class="inner">
<header class="major">
<h1>What I have learned from 2 years of FRC programming</h1>
</header>
<p>2019-06-21 11:14:00 -0400</p>
<p><p>Over the past two years (2018 / 2019), I have been a member of my school’s <a href="https://www.firstinspires.org/robotics/frc">FRC</a> team, <a href="frc5024.github.io">Raider Robotics</a>. Specifically, a programmer.</p>
<header class="major">
<h1><a href="/ctf/2019/06/23/googlectf.html" class="link">I gave Google's CTF a short try and learned a thing or two</a></h1>
</header>
<!-- Cheaty way to display a description -->
<h3>&nbsp;&nbsp;&nbsp;&nbsp;But exams got in the way and took all the fun</h3>
<hr>
<!--
<p>2019-06-23 18:04:00 -0400</p>
<p><p>Honestly, I completely forgot that this was the weekend of Google’s online <a href="https://g.co/ctf">CTF Qualifications</a> for 2019 and was late, unprepared, busy, and did not have a team to work with.</p>
<h2 id="what-is-this-event">What is this event?</h2>
<p>Google hosts a (yearly?) event where hackers from around the world team up and attempt a variety of tasks like: exploiting machines over a network, reversing firmware, pulling passwords from tcp packets, hacking crypto stuff (something I suck at), breaking compilers. and much more. Generally, this event and others like it are really fun.</p>
<h2 id="what-i-learned">What I learned</h2>
<p>Many questions I worked on involved extracting a key from a binary. I employed two vastly different tools for this job. First, a standard linux tool, <code class="highlighter-rouge">strings</code>. When passed a filename, it will extract and print all human-readable strings it can find to the terminal. The flag is usually in this dump. If not, I use the second tool. <a href="https://www.nsa.gov/resources/everyone/ghidra/">Ghidra</a>, an open-source reverse engineering tool designed by the NSA. I used this tool a fair amount during my quick attempt at GCTF.</p>
<h2 id="will-i-do-this-again">Will I do this again?</h2>
<p>Yes! The CTF was very fun to try, and I will definitely give it a proper shot next time.</p>
</p> -->
<header class="major">
<h1><a href="/frc/2019/06/21/Robot-Experiences.html" class="link">What I have learned from 2 years of FRC programming</a></h1>
</header>
<!-- Cheaty way to display a description -->
<h3>&nbsp;&nbsp;&nbsp;&nbsp;Robots are pretty cool</h3>
<hr>
<!--
<p>2019-06-21 11:14:00 -0400</p>
<p><p>Over the past two years (2018 / 2019), I have been a member of my school’s <a href="https://www.firstinspires.org/robotics/frc">FRC</a> team, <a href="frc5024.github.io">Raider Robotics</a>. Specifically, a programmer.</p>
<h2 id="my-roles">My roles</h2>
<p>In my first year, I joined the team as a programmer and had a fun time learning about embedded programming and development with hardware. Then, in my second year, I was promoted to programming co-lead along with <a href="https://github.com/slownie">@slownie</a>. I much preferred my second season because I had a better understanding of the technology I was working with, and we got to play with some cool tools throughout the season.</p>
@ -136,16 +163,20 @@
<li>Dedicate a day to robot driving lessons</li>
<li>Use a custom library with wrappers and tools built by me to provide easy interfaces for new programmers</li>
</ul>
</p>
</p> -->
<header class="major">
<h1>Blogs I Read</h1>
</header>
<p>2019-06-18 09:18:00 -0400</p>
<p><p>This is a copy-pastable list of rss feeds I subscribe to:</p>
<header class="major">
<h1><a href="/random/2019/06/18/Blogs-I-Read.html" class="link">Blogs I Read</a></h1>
</header>
<!-- Cheaty way to display a description -->
<h3>&nbsp;&nbsp;&nbsp;&nbsp;The constantly updating list</h3>
<hr>
<!--
<p>2019-06-18 09:18:00 -0400</p>
<p><p>This is a copy-pastable list of rss feeds I subscribe to:</p>
<div class="highlighter-rouge"><div class="highlight"><pre class="highlight"><code>https://www.firstinspires.org/robotics/frc/blog-rss
https://lukesmith.xyz/rss.xml
@ -154,16 +185,20 @@ http://www.windytan.com/rss.xml
http://psy-lob-saw.blogspot.com/rss.xml
https://retrylife.ca/feed.xml
</code></pre></div></div>
</p>
</p> -->
<header class="major">
<h1>I made a new song!</h1>
</header>
<p>2019-06-17 06:20:00 -0400</p>
<p><p>I am currently taking a class in school called <a href="https://www.facebook.com/studio225beal/">Music and computers (AMM2M)</a>, where as part of the class, whe get together into bands, and produce a song. After taking a break from music production for over a year, we have released our song for the class (we do two songs, but the second is not finished yet).</p>
<header class="major">
<h1><a href="/music/2019/06/17/AMM2M1-release.html" class="link">I made a new song!</a></h1>
</header>
<!-- Cheaty way to display a description -->
<h3>&nbsp;&nbsp;&nbsp;&nbsp;Releasing a new song with friends at school</h3>
<hr>
<!--
<p>2019-06-17 06:20:00 -0400</p>
<p><p>I am currently taking a class in school called <a href="https://www.facebook.com/studio225beal/">Music and computers (AMM2M)</a>, where as part of the class, whe get together into bands, and produce a song. After taking a break from music production for over a year, we have released our song for the class (we do two songs, but the second is not finished yet).</p>
<h2 id="my-contribution">My contribution</h2>
<p>My main contribution to the project was a mix of live drumming, and most of the song’s MIDI work. The song is far from perfect, but pretty good for the time we had to produce it.</p>
@ -175,16 +210,20 @@ https://retrylife.ca/feed.xml
<source src="/assets/audio/SpamPhoneCalls.mp3" type="audio/mpeg" />
Your browser does not support audio players
</audio>
</p>
</p> -->
<header class="major">
<h1>Graphing the relation between wheels and awards for FRC</h1>
</header>
<p>2019-06-16 11:51:00 -0400</p>
<p><p>I was scrolling through reddit the other day, and came across <a href="https://www.reddit.com/r/FRC/comments/byzv5q/i_know_what_im_doing/">this great post</a> by u/<a href="https://www.reddit.com/user/MasterQuacks/">MasterQuacks</a>.</p>
<header class="major">
<h1><a href="/frc/2019/06/16/Graphing-w2a.html" class="link">Graphing the relation between wheels and awards for FRC</a></h1>
</header>
<!-- Cheaty way to display a description -->
<h3>&nbsp;&nbsp;&nbsp;&nbsp;AKA. Why programmer + reddit + matplotlib is a bad idea.</h3>
<hr>
<!--
<p>2019-06-16 11:51:00 -0400</p>
<p><p>I was scrolling through reddit the other day, and came across <a href="https://www.reddit.com/r/FRC/comments/byzv5q/i_know_what_im_doing/">this great post</a> by u/<a href="https://www.reddit.com/user/MasterQuacks/">MasterQuacks</a>.</p>
<p><img src="/assets/images/w2ainspo.jpg" alt="My insporation" /></p>
@ -237,16 +276,20 @@ Your browser does not support audio players
<p>Here is the resulting image. From left, to right: 5024, 254, 2224, 5406, 2056</p>
<p><img src="/assets/images/w2a.png" alt="Thr result" /></p>
</p>
</p> -->
<header class="major">
<h1>GitHub's CSS is boring. So I refreshed the design</h1>
</header>
<p>2019-06-12 09:09:00 -0400</p>
<p><p>I have been using GitHub since 2017, and have been getting tired of GitHub’s theme. I didn’t need a huge change, just a small refresh. So, to solve this, I whipped out <a href="https://addons.mozilla.org/en-CA/firefox/addon/styl-us/">Stylus</a> and made a nice little CSS file for it.</p>
<header class="major">
<h1><a href="/css/2019/06/12/Styiling-GitHub.html" class="link">GitHub's CSS is boring. So I refreshed the design</a></h1>
</header>
<!-- Cheaty way to display a description -->
<h3>&nbsp;&nbsp;&nbsp;&nbsp;</h3>
<hr>
<!--
<p>2019-06-12 09:09:00 -0400</p>
<p><p>I have been using GitHub since 2017, and have been getting tired of GitHub’s theme. I didn’t need a huge change, just a small refresh. So, to solve this, I whipped out <a href="https://addons.mozilla.org/en-CA/firefox/addon/styl-us/">Stylus</a> and made a nice little CSS file for it.</p>
<h2 id="the-css">The CSS</h2>
<p>Here is the CSS. Feel free to play with it.</p>
@ -285,16 +328,20 @@ Your browser does not support audio players
<h2 id="use-it-yourself">Use it yourself</h2>
<p>I put this theme on userstyles.org. You can download and install it by going to <a href="https://userstyles.org/styles/172679/ewpratten-s-githubtheme">my userstyles page</a>.</p>
</p>
</p> -->
<header class="major">
<h1>Building a safe and easy system for sending computer vision data from a raspberry pi to a roborio</h1>
</header>
<p>2019-05-27 05:22:00 -0400</p>
<p><p>Computer vision on an FRC robot has some problems.</p>
<header class="major">
<h1><a href="/frc/2019/05/27/Building-Safe-Vision-Comms.html" class="link">Building a safe and easy system for sending computer vision data from a raspberry pi to a roborio</a></h1>
</header>
<!-- Cheaty way to display a description -->
<h3>&nbsp;&nbsp;&nbsp;&nbsp;</h3>
<hr>
<!--
<p>2019-05-27 05:22:00 -0400</p>
<p><p>Computer vision on an FRC robot has some problems.</p>
<ul>
<li>RoboRIO is not powerfull enough</li>
<li>NetworkTables is not fast enough</li>
@ -322,16 +369,20 @@ Your browser does not support audio players
</ul>
<p>I am currently working on a protocol for solving this problem, nad will post an update here once it has been tested. Feel free to let me know your thoughts and ideas.</p>
</p>
</p> -->
<header class="major">
<h1>The language hunt</h1>
</header>
<p>2019-04-30 14:32:00 -0400</p>
<p><p>Our programming team is looking to switch languages in the 2020 season. Here is the what, why, and how.</p>
<header class="major">
<h1><a href="/frc/2019/04/30/FRC-Languages.html" class="link">The language hunt</a></h1>
</header>
<!-- Cheaty way to display a description -->
<h3>&nbsp;&nbsp;&nbsp;&nbsp;</h3>
<hr>
<!--
<p>2019-04-30 14:32:00 -0400</p>
<p><p>Our programming team is looking to switch languages in the 2020 season. Here is the what, why, and how.</p>
<h2 id="our-history">Our history</h2>
<p>We started out as a java team back in 2014 because java was (and still is) the language being taught in our programming classes. Honestly, our code sucked, as many rookie team’s do. There where no fancy features, or sensor-assisted autonomous. Direct input into talons was our way to roll.</p>
@ -346,16 +397,20 @@ Your browser does not support audio players
<h2 id="part-2">Part 2</h2>
<p>We are currently doing our evaluation of new programming languages, and an update will be posted to this blog in the near future.</p>
</p>
</p> -->
<header class="major">
<h1>Using a python script to create devRant posts based on the style and content of another user</h1>
</header>
<p>2018-06-27 14:32:00 -0400</p>
<p><p>Ok… The title is slightly wrong. There are actually 2 scripts.. Sorry about that.</p>
<header class="major">
<h1><a href="/devrant/2018/06/27/BecomeRanter.html" class="link">Using a python script to create devRant posts based on the style and content of another user</a></h1>
</header>
<!-- Cheaty way to display a description -->
<h3>&nbsp;&nbsp;&nbsp;&nbsp;</h3>
<hr>
<!--
<p>2018-06-27 14:32:00 -0400</p>
<p><p>Ok… The title is slightly wrong. There are actually 2 scripts.. Sorry about that.</p>
<p>This is a guide on installing and using the <a href="https://github.com/Ewpratten/BecomeRanter">BecomeRanter</a> script.</p>
@ -406,8 +461,8 @@ pip3 install tensorflow-gpu #for gpu processing
<p>A new hdf5 file will be generated in the same folder as the script</p>
</p>
</p> -->
</div>
</section>

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<!DOCTYPE html>
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<!--[if lte IE 8]><script src="/assets/js/ie/html5shiv.js"></script><![endif]-->
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<li><a href="http://localhost:4000//">Home</a></li>
<li><a href="http://localhost:4000/all_posts.html">All posts</a></li>
</ul>
<ul class="actions vertical">
<li><a href="#" class="button special fit">Get Started</a></li>
<li><a href="#" class="button fit">Log In</a></li>
</ul>
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<!-- Main -->
<div id="main" class="alt">
<!-- One -->
<section id="one">
<div class="inner">
<header class="major">
<h1>I gave Google's CTF a short try and learned a thing or two</h1>
</header>
<p><p>Honestly, I completely forgot that this was the weekend of Google’s online <a href="https://g.co/ctf">CTF Qualifications</a> for 2019 and was late, unprepared, busy, and did not have a team to work with.</p>
<h2 id="what-is-this-event">What is this event?</h2>
<p>Google hosts a (yearly?) event where hackers from around the world team up and attempt a variety of tasks like: exploiting machines over a network, reversing firmware, pulling passwords from tcp packets, hacking crypto stuff (something I suck at), breaking compilers. and much more. Generally, this event and others like it are really fun.</p>
<h2 id="what-i-learned">What I learned</h2>
<p>Many questions I worked on involved extracting a key from a binary. I employed two vastly different tools for this job. First, a standard linux tool, <code class="highlighter-rouge">strings</code>. When passed a filename, it will extract and print all human-readable strings it can find to the terminal. The flag is usually in this dump. If not, I use the second tool. <a href="https://www.nsa.gov/resources/everyone/ghidra/">Ghidra</a>, an open-source reverse engineering tool designed by the NSA. I used this tool a fair amount during my quick attempt at GCTF.</p>
<h2 id="will-i-do-this-again">Will I do this again?</h2>
<p>Yes! The CTF was very fun to try, and I will definitely give it a proper shot next time.</p>
</p>
</div>
</section>
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_site/feed.xml
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<?xml version="1.0" encoding="utf-8"?><feed xmlns="http://www.w3.org/2005/Atom" ><generator uri="https://jekyllrb.com/" version="3.8.5">Jekyll</generator><link href="http://localhost:4000/feed.xml" rel="self" type="application/atom+xml" /><link href="http://localhost:4000/" rel="alternate" type="text/html" /><updated>2019-06-21T16:12:12-04:00</updated><id>http://localhost:4000/feed.xml</id><title type="html">Evan Pratten</title><subtitle>Computer wizard, student, &lt;a href=&quot;https://github.com/frc5024&quot;&gt;@frc5024&lt;/a&gt; programming team lead, and radio enthusiast.</subtitle><entry><title type="html">What I have learned from 2 years of FRC programming</title><link href="http://localhost:4000/frc/2019/06/21/Robot-Experiences.html" rel="alternate" type="text/html" title="What I have learned from 2 years of FRC programming" /><published>2019-06-21T11:14:00-04:00</published><updated>2019-06-21T11:14:00-04:00</updated><id>http://localhost:4000/frc/2019/06/21/Robot-Experiences</id><content type="html" xml:base="http://localhost:4000/frc/2019/06/21/Robot-Experiences.html">&lt;p&gt;Over the past two years (2018 / 2019), I have been a member of my school’s &lt;a href=&quot;https://www.firstinspires.org/robotics/frc&quot;&gt;FRC&lt;/a&gt; team, &lt;a href=&quot;frc5024.github.io&quot;&gt;Raider Robotics&lt;/a&gt;. Specifically, a programmer.&lt;/p&gt;
<?xml version="1.0" encoding="utf-8"?><feed xmlns="http://www.w3.org/2005/Atom" ><generator uri="https://jekyllrb.com/" version="3.8.5">Jekyll</generator><link href="http://localhost:4000/feed.xml" rel="self" type="application/atom+xml" /><link href="http://localhost:4000/" rel="alternate" type="text/html" /><updated>2019-06-24T12:06:10-04:00</updated><id>http://localhost:4000/feed.xml</id><title type="html">Evan Pratten</title><subtitle>Computer wizard, student, &lt;a href=&quot;https://github.com/frc5024&quot;&gt;@frc5024&lt;/a&gt; programming team lead, and radio enthusiast.</subtitle><entry><title type="html">I gave Google’s CTF a short try and learned a thing or two</title><link href="http://localhost:4000/ctf/2019/06/23/googlectf.html" rel="alternate" type="text/html" title="I gave Google's CTF a short try and learned a thing or two" /><published>2019-06-23T18:04:00-04:00</published><updated>2019-06-23T18:04:00-04:00</updated><id>http://localhost:4000/ctf/2019/06/23/googlectf</id><content type="html" xml:base="http://localhost:4000/ctf/2019/06/23/googlectf.html">&lt;p&gt;Honestly, I completely forgot that this was the weekend of Google’s online &lt;a href=&quot;https://g.co/ctf&quot;&gt;CTF Qualifications&lt;/a&gt; for 2019 and was late, unprepared, busy, and did not have a team to work with.&lt;/p&gt;
&lt;h2 id=&quot;what-is-this-event&quot;&gt;What is this event?&lt;/h2&gt;
&lt;p&gt;Google hosts a (yearly?) event where hackers from around the world team up and attempt a variety of tasks like: exploiting machines over a network, reversing firmware, pulling passwords from tcp packets, hacking crypto stuff (something I suck at), breaking compilers. and much more. Generally, this event and others like it are really fun.&lt;/p&gt;
&lt;h2 id=&quot;what-i-learned&quot;&gt;What I learned&lt;/h2&gt;
&lt;p&gt;Many questions I worked on involved extracting a key from a binary. I employed two vastly different tools for this job. First, a standard linux tool, &lt;code class=&quot;highlighter-rouge&quot;&gt;strings&lt;/code&gt;. When passed a filename, it will extract and print all human-readable strings it can find to the terminal. The flag is usually in this dump. If not, I use the second tool. &lt;a href=&quot;https://www.nsa.gov/resources/everyone/ghidra/&quot;&gt;Ghidra&lt;/a&gt;, an open-source reverse engineering tool designed by the NSA. I used this tool a fair amount during my quick attempt at GCTF.&lt;/p&gt;
&lt;h2 id=&quot;will-i-do-this-again&quot;&gt;Will I do this again?&lt;/h2&gt;
&lt;p&gt;Yes! The CTF was very fun to try, and I will definitely give it a proper shot next time.&lt;/p&gt;</content><author><name></name></author><summary type="html">Honestly, I completely forgot that this was the weekend of Google’s online CTF Qualifications for 2019 and was late, unprepared, busy, and did not have a team to work with.</summary></entry><entry><title type="html">What I have learned from 2 years of FRC programming</title><link href="http://localhost:4000/frc/2019/06/21/Robot-Experiences.html" rel="alternate" type="text/html" title="What I have learned from 2 years of FRC programming" /><published>2019-06-21T11:14:00-04:00</published><updated>2019-06-21T11:14:00-04:00</updated><id>http://localhost:4000/frc/2019/06/21/Robot-Experiences</id><content type="html" xml:base="http://localhost:4000/frc/2019/06/21/Robot-Experiences.html">&lt;p&gt;Over the past two years (2018 / 2019), I have been a member of my school’s &lt;a href=&quot;https://www.firstinspires.org/robotics/frc&quot;&gt;FRC&lt;/a&gt; team, &lt;a href=&quot;frc5024.github.io&quot;&gt;Raider Robotics&lt;/a&gt;. Specifically, a programmer.&lt;/p&gt;
&lt;h2 id=&quot;my-roles&quot;&gt;My roles&lt;/h2&gt;
&lt;p&gt;In my first year, I joined the team as a programmer and had a fun time learning about embedded programming and development with hardware. Then, in my second year, I was promoted to programming co-lead along with &lt;a href=&quot;https://github.com/slownie&quot;&gt;@slownie&lt;/a&gt;. I much preferred my second season because I had a better understanding of the technology I was working with, and we got to play with some cool tools throughout the season.&lt;/p&gt;

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<h3><a href="/ctf/2019/06/23/googlectf.html" class="link">I gave Google's CTF a short try and learned a thing or two</a></h3>
<p>But exams got in the way and took all the fun</p>
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<h3><a href="/frc/2019/05/27/Building-Safe-Vision-Comms.html" class="link">Building a safe and easy system for sending computer vision data from a raspberry pi to a roborio</a></h3>
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