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1<!DOCTYPE html>
2<html lang="en">
3
4<head>
5 <meta charset="UTF-8">
6 <title>Gradecoin</title>
7 <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
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26 <link rel="stylesheet" href="/normalize.css">
27 <link rel="stylesheet" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;juice.css">
28
29<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/animate.css/4.1.1/animate.min.css" />
30
31</head>
32
33<body>
34
35
36 <header class="pos-absolute" style="background-color: transparent">
37
38
39<a href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;">
40 <div class="logo">
41 <img src="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;gradecoin.png" alt="logo">
42 Gradecoin
43 </div>
44</a>
45
46<nav>
47
48 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;block-docs&#x2F;">Blocks</a>
49
50 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;transaction-docs&#x2F;">Transactions</a>
51
52 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;register-docs&#x2F;">Register</a>
53
54 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;jwt&#x2F;">JWT</a>
55
56
57
58 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;github.com&#x2F;zhuowei&#x2F;nft_ptr#why">why?</a>
59
60
61</nav>
62
63 </header>
64
65 <div class="hero">
66
67<section class="text-center">
68 <h1 class="heading-text animate__animated animate__jackInTheBox" style="font-size: 50px">
69 Mine your own grades
70 </h1>
71 <h3 class="title-text">
72 <b>Gradecoin</b> is the latest cutting edge blockchain technology agile grading framework that drives organic engagement and other buzzwords, with big data mining search engine optimization
73 </h3>
74 <div>
75 </div>
76</section>
77<img class="hero-image" style="width: 40%" src="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;gradecoin.png">
78
79<div class="explore-more text"
80 onclick="document.getElementById('features').scrollIntoView({behavior: 'smooth'})">
81 ⇩ Learn How ⇩
82</div>
83<style>
84
85.hero section {
86 padding: 0 5rem;
87}
88
89@media screen and (max-width: 768px) {
90 .hero section {
91 padding: 0 2rem;
92 }
93
94 .hero-image {
95 display: none
96 }
97
98}
99footer {
100 color: #8b8b8b;
101}
102</style>
103
104 </div>
105
106
107
108 <main>
109
110
111
112
113
114 <div class="toc">
115 <div class="toc-sticky">
116
117 <div class="toc-item">
118 <a class="subtext" href="https://gradecoin.xyz/#welcome-to-gradecoin">Welcome to Gradecoin!</a>
119 </div>
120
121
122 <div class="toc-item">
123 <a class="subtext" href="https://gradecoin.xyz/#coinbase">Coinbase</a>
124 </div>
125
126
127 <div class="toc-item">
128 <a class="subtext" href="https://gradecoin.xyz/#public-key-signatures">Public Key Signatures</a>
129 </div>
130
131
132 <div class="toc-item">
133 <a class="subtext" href="https://gradecoin.xyz/#services">Services</a>
134 </div>
135
136
137 <div class="toc-item-child">
138 <a class="subtext" href="https://gradecoin.xyz/#register"><small>- &#x2F;register</small></a>
139 </div>
140
141 <div class="toc-item-child">
142 <a class="subtext" href="https://gradecoin.xyz/#transaction"><small>- &#x2F;transaction</small></a>
143 </div>
144
145 <div class="toc-item-child">
146 <a class="subtext" href="https://gradecoin.xyz/#block"><small>- &#x2F;block</small></a>
147 </div>
148
149
150
151 <div class="toc-item">
152 <a class="subtext" href="https://gradecoin.xyz/#questions">Questions</a>
153 </div>
154
155
156 <div class="toc-item-child">
157 <a class="subtext" href="https://gradecoin.xyz/#this-all-sound-complicated"><small>- This all sound complicated!</small></a>
158 </div>
159
160 <div class="toc-item-child">
161 <a class="subtext" href="https://gradecoin.xyz/#i-found-a-bug"><small>- I found a bug!</small></a>
162 </div>
163
164 <div class="toc-item-child">
165 <a class="subtext" href="https://gradecoin.xyz/#i-hacked-the-server"><small>- I hacked the server!</small></a>
166 </div>
167
168 <div class="toc-item-child">
169 <a class="subtext" href="https://gradecoin.xyz/#submission"><small>- Submission?</small></a>
170 </div>
171
172 <div class="toc-item-child">
173 <a class="subtext" href="https://gradecoin.xyz/#can-my-friends-play"><small>- Can my friends play?</small></a>
174 </div>
175
176 <div class="toc-item-child">
177 <a class="subtext" href="https://gradecoin.xyz/#how-and-or-why"><small>- How and or Why?</small></a>
178 </div>
179
180
181
182 </div>
183 </div>
184
185
186
187 <div class="content text">
188
189 <div id="features" class="heading-text">Overview</div>
190 <h1 id="welcome-to-gradecoin">Welcome to Gradecoin!</h1>
191<p>Blockchains are incredibly simple yet can appear very complicated, we will see how they work and practice programming <em>production</em> cryptography code.</p>
192<p>This server is the sandbox for the PA1, it's currently running the Gradecoin application. Gradecoin is the faux currency we will use to simulate a blockchain network. At the end of the simulation, the amount of Gradecoin you hold will be your PA1 grade.</p>
193<p><strong>A quick summary</strong>: authenticate yourself to the system using public key encryption.
194Craft <a href="https://gradecoin.xyz/transaction-docs/">Transaction</a> proposals and tag them using <a href="https://gradecoin.xyz/jwt/">JWTs</a>.
195When there are enough transactions then you can propose <a href="https://gradecoin.xyz/block-docs/">Blocks</a> in the same way.
196Blocks need to be <em>mined</em> beforehand using Proof-of-work, or brute force.</p>
197<p>Gradecoin offers 3 endpoints at <a href="/register">/register</a>, <a href="/block">/block</a> and <a href="/transaction">/transaction</a>. You can only send GET requests to /block and /transaction without authorization.
198The server is programmed in <a href="https://www.service-architecture.com/articles/web-services/representational_state_transfer_rest.html">RESTful</a> architecture, there are no <code>DELETE</code>, <code>PUT</code> or <code>UPDATE</code> operations, though.</p>
199<p>Gradecoin uses a Proof-of-work block accepting mechanism. It uses single round <a href="https://www.blake2.net/">Blake2s</a> hashing which produces 256-bit (64 hexadecimal characters) output. The <a href="https://wiki.bitcoinsv.io/index.php/Target">target</a> hash is <em>24 bits</em> or <em>6 hexadecimal characters</em> of 0. During testing, I could mine a block on average around 2-7 minutes.</p>
200<blockquote>
201<p>We're expecting you to use existing tools and implementations. Standards are hard. <a href="https://www.reddit.com/r/crypto/comments/2coqsy/dont_roll_your_own/">Don't roll your own crypto</a>. Feel free to ask questions. Collaborate.</p>
202</blockquote>
203<p>You might ask,</p>
204<blockquote>
205<p>But if nobody has any Gradecoin then how do we have transactions?</p>
206</blockquote>
207<p>There is a bank! Their public key is <code>31415926535897932384626433832795028841971693993751058209749445923</code> and they have some amount of Gradecoin preloaded. It's also the only account that you can send transactions requests <em>to</em> yourself.</p>
208<h1 id="coinbase">Coinbase</h1>
209<p>The first transactions of a block is called the <code>coinbase</code>. They are the <strong>author</strong> of the block proposal and if the block is accepted then they get compensated for their efforts with some Gradecoin.</p>
210<h1 id="public-key-signatures">Public Key Signatures</h1>
211<p>Gradecoin uses 2048 bit RSA keyspairs.</p>
212<h1 id="services">Services</h1>
213<h2 id="register">/register</h2>
214<ul>
215<li>Student creates their own 2048 bit RSA <code>keypair</code></li>
216<li>Downloads <code>Gradecoin</code>'s Public Key from <a href="https://odtuclass.metu.edu.tr/my/">Moodle</a></li>
217<li>Encrypts their JSON wrapped <code>Public Key</code>, <code>Student ID</code> and one time <code>passwd</code> using Gradecoin's Public Key</li>
218<li>Their public key is now in our database and can be used to sign their JWT's during requests</li>
219</ul>
220<h2 id="transaction">/transaction</h2>
221<ul>
222<li>You can offer a <a href="/transaction">Transaction</a> - POST request
223<ul>
224<li>The request should have <code>Authorization</code></li>
225<li>The request header should be signed by the Public Key of the <code>by</code> field in the transaction</li>
226</ul>
227</li>
228<li>fetch the list of <code>Transaction</code>s - GET request</li>
229</ul>
230<h2 id="block">/block</h2>
231<ul>
232<li>offer a [<code>schema::Block</code>] - POST request
233<ul>
234<li>The request should have <code>Authorization</code></li>
235<li>The [<code>schema::Block::transaction_list</code>] of the block should be a subset of [<code>schema::Db::pending_transactions</code>]</li>
236</ul>
237</li>
238<li>fetch the last accepted [<code>schema::Block</code>] - GET request</li>
239</ul>
240<p><code>Authorization</code>: The request header should have Bearer JWT.Token signed with Student Public Key</p>
241<h1 id="questions">Questions</h1>
242<h2 id="this-all-sound-complicated">This all sound complicated!</h2>
243<ul>
244<li>I've drawn inspiration from <a href="https://explorer.bitcoin.com/btc">actual Bitcoin transactions</a> and <a href="https://github.com/seanmonstar/warp/blob/master/examples/todos.rs">warp</a>. The simplicity of the system is how little interfaces it has.</li>
245<li>Don't know where to start? Gradecoin uses RESTful API; simple <code>curl</code> commands or even your browser will work! <a href="https://curl.trillworks.com/">This website can help as well</a>.</li>
246<li><a href="https://jwt.io">JWT Debugger</a> and the corresponding <a href="https://tools.ietf.org/html/rfc7519">RFC</a></li>
247<li>Remember that you are absolutely encouraged to grab off-the-shelf implementations for every cryptography primitive you will use. You can start by finding a code snippet to generate a RSA keypair?</li>
248</ul>
249<h2 id="i-found-a-bug">I found a bug!</h2>
250<p>Thank you! Please <a href="mailto:yigit@ceng.metu.edu.tr">let me know</a> so we can solve it.</p>
251<h2 id="i-hacked-the-server">I hacked the server!</h2>
252<p>That wasn't supposed to happen :( I did not place any intentional vulnerabilities to the system so if you cracked something, it was not intended. Please don't abuse it and let me know so I can patch it.</p>
253<h2 id="submission">Submission?</h2>
254<p>At the end of the <em>simulation</em>, your Gradecoin balance will be your grade. I will also expect a unique client programmed in either;</p>
255<ul>
256<li>c</li>
257<li>c++</li>
258<li>perl</li>
259<li>rust</li>
260<li>python</li>
261<li>random assortment of bash scripts</li>
262</ul>
263<p>If your favourite programming language is missing please let me know 🤷?</p>
264<h2 id="can-my-friends-play">Can my friends play?</h2>
265<p>Sadly, no. Student's who are enrolled to the class will receive one-time-passwords for authentication.</p>
266<h2 id="how-and-or-why">How and or Why?</h2>
267<ul>
268<li><a href="https://xkcd.com/2314/">Built</a>, <a href="https://lofi.cafe/">with</a> <a href="https://xkcd.com/2418/">Rust</a></li>
269</ul>
270
271
272 </div>
273
274
275
276 </main>
277
278
279<footer>
280Built For ⁂ CENG489 ⁂ Introduction to Computer Security
281</footer>
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