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1<!DOCTYPE html>
2<html lang="en">
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5 <meta charset="UTF-8">
6 <title>Blocks | Gradecoin </title>
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36
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39 <div class="logo">
40 <img src="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;gradecoin.png" alt="logo">
41 Gradecoin
42 </div>
43</a>
44
45<nav>
46
47 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;register-docs&#x2F;">Register</a>
48
49 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;jwt&#x2F;">JWT</a>
50
51 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;transaction-docs&#x2F;">Transactions</a>
52
53 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;block-docs&#x2F;">Blocks</a>
54
55
56
57 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;github.com&#x2F;zhuowei&#x2F;nft_ptr#why">why?</a>
58
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61
62</header>
63
64
65 <main>
66
67
68
69
70
71 <div class="toc">
72 <div class="toc-sticky">
73
74 <div class="toc-item">
75 <a class="subtext" href="https://gradecoin.xyz/block-docs/#requests">Requests</a>
76 </div>
77
78
79 <div class="toc-item-child">
80 <a class="subtext" href="https://gradecoin.xyz/block-docs/#get"><small>- GET</small></a>
81 </div>
82
83 <div class="toc-item-child">
84 <a class="subtext" href="https://gradecoin.xyz/block-docs/#post"><small>- POST</small></a>
85 </div>
86
87
88
89 <div class="toc-item">
90 <a class="subtext" href="https://gradecoin.xyz/block-docs/#fields">Fields</a>
91 </div>
92
93
94 </div>
95 </div>
96
97
98
99 <div class="content text">
100
101<div class="heading-text">Block Documentation</div>
102<p>A block that was proposed to commit Transactions in <code>transaction_list</code> to the
103ledger with a nonce that made <code>hash</code> valid; 6 zeroes at the left hand side of the
104hash (24 bytes).</p>
105<p>We are <em>mining</em> using <a href="https://www.blake2.net/">blake2s</a> algorithm, which produces 256 bit hashes. Hash/second is roughly 20x10^3 on my machine, a new block can be mined in around 4-6 minutes.</p>
106<h1 id="requests">Requests</h1>
107<h2 id="get">GET</h2>
108<p>A HTTP <code>GET</code> request to <a href="/block">/block</a> endpoint will return the latest mined block.</p>
109<h2 id="post">POST</h2>
110<p>A HTTP <code>POST</code> request with Authorization using JWT will allow you to propose your own blocks.</p>
111<h1 id="fields">Fields</h1>
112<pre style="background-color:#ffffff;">
113<code><span style="color:#545052;">transaction_list: [array of Fingerprints]
114nonce: unsigned 32-bit integer
115timestamp: ISO 8601 &lt;date&gt;T&lt;time&gt;
116hash: String
117</span></code></pre>
118<p><a href="https://en.wikipedia.org/wiki/ISO_8601#Combined_date_and_time_representations">ISO 8601 Reference</a></p>
119
120
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129Built For ⁂ CENG489 ⁂ Introduction to Computer Security
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1<!DOCTYPE html>
2<html lang="en">
3
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5 <meta charset="UTF-8">
6 <title>Gradecoin</title>
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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;register-docs&#x2F;">Register</a>
49
50 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;jwt&#x2F;">JWT</a>
51
52 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;transaction-docs&#x2F;">Transactions</a>
53
54 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;block-docs&#x2F;">Blocks</a>
55
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58 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;github.com&#x2F;zhuowei&#x2F;nft_ptr#why">why?</a>
59
60
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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
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86 padding: 0 5rem;
87}
88
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90 .hero section {
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95 display: none
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103
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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
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277
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72 <div class="toc-sticky">
73
74 <div class="toc-item">
75 <a class="subtext" href="https://gradecoin.xyz/jwt/#how">How?</a>
76 </div>
77
78
79 <div class="toc-item">
80 <a class="subtext" href="https://gradecoin.xyz/jwt/#algorithm">Algorithm</a>
81 </div>
82
83
84 <div class="toc-item">
85 <a class="subtext" href="https://gradecoin.xyz/jwt/#references">References</a>
86 </div>
87
88
89 </div>
90 </div>
91
92
93
94 <div class="content text">
95
96<div class="heading-text">JSON Web Token Documentation</div>
97<blockquote>
98<p>JSON Web Tokens are representations of claims, or authorization proofs that fit into the <code>Header</code> of HTTP requests.</p>
99</blockquote>
100<h1 id="how">How?</h1>
101<p>JWTs are used as the <a href="https://en.wikipedia.org/wiki/Message_authentication_code">MAC</a> of operations that require authorization:</p>
102<ul>
103<li>block proposal</li>
104<li>transaction proposal.</li>
105</ul>
106<p>They are send alongside the JSON request body in the <code>Header</code>;</p>
107<pre style="background-color:#ffffff;">
108<code class="language-html" data-lang="html"><span style="color:#545052;">Authorization: Bearer aaaaaa.bbbbbb.ccccc
109</span></code></pre>
110<p>Gradecoin uses 3 fields for the JWTs;</p>
111<pre style="background-color:#ffffff;">
112<code class="language-json" data-lang="json"><span style="color:#545052;">{
113&quot;</span><span style="color:#009854;">tha</span><span style="color:#545052;">&quot;: &quot;</span><span style="color:#009854;">Hash of the payload, check invididual references</span><span style="color:#545052;">&quot;,
114&quot;</span><span style="color:#009854;">iat</span><span style="color:#545052;">&quot;: &quot;</span><span style="color:#009854;">Issued At, Unix Time</span><span style="color:#545052;">&quot;,
115&quot;</span><span style="color:#009854;">exp</span><span style="color:#545052;">&quot;: &quot;</span><span style="color:#009854;">Expiration Time, epoch</span><span style="color:#545052;">&quot;
116}
117</span></code></pre>
118<ul>
119<li><code>tha</code> is explained in <a href="https://gradecoin.xyz/block-docs/">blocks</a> and <a href="https://gradecoin.xyz/transaction-docs/">transactions</a> documentations.</li>
120<li><code>iat</code> when the JWT was created in <a href="https://en.wikipedia.org/wiki/Unix_time">Unix Time</a> format</li>
121<li><code>exp</code> when the JWT will expire &amp; be rejected in <a href="https://en.wikipedia.org/wiki/Unix_time">Unix Time</a></li>
122</ul>
123<h1 id="algorithm">Algorithm</h1>
124<p>We are using <a href="https://www.rfc-editor.org/rfc/rfc7518.html#section-3.1">RS256</a>, <code>RSASSA-PKCS1-v1_5 using SHA-256</code>. The JWTs you encode with your private RSA key will be decoded using the public key you have authenticated with. You can see how the process works <a href="https://jwt.io/">here</a>.</p>
125<h1 id="references">References</h1>
126<ul>
127<li><a href="https://tools.ietf.org/html/rfc7519">RFC, the ultimate reference</a></li>
128<li><a href="https://jwt.io/">JWT Debugger</a></li>
129</ul>
130
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75 <a class="subtext" href="https://gradecoin.xyz/register-docs/#authentication-process">Authentication Process</a>
76 </div>
77
78
79 </div>
80 </div>
81
82
83
84 <div class="content text">
85
86<div class="heading-text">Register Documentation</div>
87<p>POST request to /register endpoint</p>
88<p>Lets a user to authenticate themselves to the system.
89Only people who are enrolled to the class can open Gradecoin accounts.
90This is enforced with your Student ID and a one time password you will receive.</p>
91<h1 id="authentication-process">Authentication Process</h1>
92<ul>
93<li>Gradecoin's Public Key (<code>gradecoin_public_key</code>) is listed on our Moodle page.</li>
94<li>You pick a short temporary key (<code>k_temp</code>)</li>
95<li>Create a JSON object (<code>auth_plaintext</code>) with your <code>metu_id</code> and <code>public key</code> in base64 (PEM) format (<code>S_PK</code>) <a href="https://tls.mbed.org/kb/cryptography/asn1-key-structures-in-der-and-pem">reference</a></li>
96</ul>
97<pre style="background-color:#ffffff;">
98<code class="language-json" data-lang="json"><span style="color:#545052;">{
99 &quot;</span><span style="color:#009854;">student_id</span><span style="color:#545052;">&quot;: &quot;</span><span style="color:#009854;">e12345</span><span style="color:#545052;">&quot;,
100 &quot;</span><span style="color:#009854;">passwd</span><span style="color:#545052;">&quot;: &quot;</span><span style="color:#009854;">15 char secret</span><span style="color:#545052;">&quot;,
101 &quot;</span><span style="color:#009854;">public_key</span><span style="color:#545052;">&quot;: &quot;</span><span style="color:#009854;">---BEGIN PUBLIC KEY...</span><span style="color:#545052;">&quot;
102}
103</span></code></pre>
104<ul>
105<li>Pick a random IV.</li>
106<li>Encrypt the serialized string of <code>auth_plaintext</code> with 128 bit block AES in CBC mode with Pkcs7 padding using the temporary key (<code>k_temp</code>), the result is <code>auth_ciphertext</code>. Encode this with base64.</li>
107<li>The temporary key you have picked <code>k_temp</code> is encrypted using RSA with OAEP padding scheme
108using SHA-256 with <code>gradecoin_public_key</code>, giving us <code>key_ciphertext</code>. Encode this with base 64.</li>
109<li>The payload JSON object (<code>auth_request</code>) can be serialized now:</li>
110</ul>
111<pre style="background-color:#ffffff;">
112<code class="language-json" data-lang="json"><span style="color:#545052;">{
113 &quot;</span><span style="color:#009854;">c</span><span style="color:#545052;">&quot;: &quot;</span><span style="color:#009854;">auth_ciphertext</span><span style="color:#545052;">&quot;,
114 &quot;</span><span style="color:#009854;">iv</span><span style="color:#545052;">&quot;: &quot;</span><span style="color:#009854;">hexadecimal</span><span style="color:#545052;">&quot;,
115 &quot;</span><span style="color:#009854;">key</span><span style="color:#545052;">&quot;: &quot;</span><span style="color:#009854;">key_ciphertext</span><span style="color:#545052;">&quot;
116}
117</span></code></pre>
118<p>If your authentication process was valid, you will be given access and your public key fingerprint that is your address.</p>
119
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to Gradecoin!\nBlockchains are incredibly simple yet can appear very complicated, we will see how they work and practice programming production cryptography code.\nThis 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.\nA quick summary: authenticate yourself to the system using public key encryption.\nCraft Transaction proposals and tag them using JWTs.\nWhen there are enough transactions then you can propose Blocks in the same way.\nBlocks need to be mined beforehand using Proof-of-work, or brute force.\nGradecoin offers 3 endpoints at /register, /block and /transaction. You can only send GET requests to /block and /transaction without authorization.\nThe server is programmed in RESTful architecture, there are no DELETE, PUT or UPDATE operations, though.\nGradecoin uses a Proof-of-work block accepting mechanism. It uses single round Blake2s hashing which produces 256-bit (64 hexadecimal characters) output. The target hash is 24 bits or 6 hexadecimal characters of 0. During testing, I could mine a block on average around 2-7 minutes.\n\nWe're expecting you to use existing tools and implementations. Standards are hard. Don't roll your own crypto. Feel free to ask questions. Collaborate.\n\nYou might ask,\n\nBut if nobody has any Gradecoin then how do we have transactions?\n\nThere is a bank! Their public key is 31415926535897932384626433832795028841971693993751058209749445923 and they have some amount of Gradecoin preloaded. It's also the only account that you can send transactions requests to yourself.\nCoinbase\nThe first transactions of a block is called the coinbase. They are the author of the block proposal and if the block is accepted then they get compensated for their efforts with some Gradecoin.\nPublic Key Signatures\nGradecoin uses 2048 bit RSA keyspairs.\nServices\n/register\n\nStudent creates their own 2048 bit RSA keypair\nDownloads Gradecoin's Public Key from Moodle\nEncrypts their JSON wrapped Public Key, Student ID and one time passwd using Gradecoin's Public Key\nTheir public key is now in our database and can be used to sign their JWT's during requests\n\n/transaction\n\nYou can offer a Transaction - POST request\n\nThe request should have Authorization\nThe request header should be signed by the Public Key of the by field in the transaction\n\n\nfetch the list of Transactions - GET request\n\n/block\n\noffer a [schema::Block] - POST request\n\nThe request should have Authorization\nThe [schema::Block::transaction_list] of the block should be a subset of [schema::Db::pending_transactions]\n\n\nfetch the last accepted [schema::Block] - GET request\n\nAuthorization: The request header should have Bearer JWT.Token signed with Student Public Key\nQuestions\nThis all sound complicated!\n\nI've drawn inspiration from actual Bitcoin transactions and warp. The simplicity of the system is how little interfaces it has.\nDon't know where to start? Gradecoin uses RESTful API; simple curl commands or even your browser will work! This website can help as well.\nJWT Debugger and the corresponding RFC\nRemember 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?\n\nI found a bug!\nThank you! Please let me know so we can solve it.\nI hacked the server!\nThat 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.\nSubmission?\nAt the end of the simulation, your Gradecoin balance will be your grade. I will also expect a unique client programmed in either;\n\nc\nc++\nperl\nrust\npython\nrandom assortment of bash scripts\n\nIf your favourite programming language is missing please let me know 🤷?\nCan my friends play?\nSadly, no. Student's who are enrolled to the class will receive one-time-passwords for authentication.\nHow and or Why?\n\nBuilt, with Rust\n\n","id":"http://127.0.0.1:1111/","title":"Gradecoin"},"http://127.0.0.1:1111/block-docs/":{"body":"A block that was proposed to commit Transactions in transaction_list to the\nledger with a nonce that made hash valid; 6 zeroes at the left hand side of the\nhash (24 bytes).\nWe are mining using blake2s algorithm, which produces 256 bit hashes. Hash/second is roughly 20x10^3 on my machine, a new block can be mined in around 4-6 minutes.\nRequests\nGET\nA HTTP GET request to /block endpoint will return the latest mined block.\nPOST\nA HTTP POST request with Authorization using JWT will allow you to propose your own blocks.\nFields\ntransaction_list: [array of Fingerprints]\nnonce: unsigned 32-bit integer\ntimestamp: ISO 8601 &lt;date&gt;T&lt;time&gt;\nhash: String\n\nISO 8601 Reference\n","id":"http://127.0.0.1:1111/block-docs/","title":"Blocks"},"http://127.0.0.1:1111/jwt/":{"body":"\nJSON Web Tokens are representations of claims, or authorization proofs that fit into the Header of HTTP requests.\n\nHow?\nJWTs are used as the MAC of operations that require authorization:\n\nblock proposal\ntransaction proposal.\n\nThey are send alongside the JSON request body in the Header;\nAuthorization: Bearer aaaaaa.bbbbbb.ccccc\n\nGradecoin uses 3 fields for the JWTs;\n{\n\"tha\": \"Hash of the payload, check invididual references\",\n\"iat\": \"Issued At, Unix Time\",\n\"exp\": \"Expiration Time, epoch\"\n}\n\n\ntha is explained in blocks and transactions documentations.\niat when the JWT was created in Unix Time format\nexp when the JWT will expire &amp; be rejected in Unix Time\n\nAlgorithm\nWe are using RS256, RSASSA-PKCS1-v1_5 using SHA-256. The JWTs you encode with your private RSA key will be decoded using the public key you have authenticated with. You can see how the process works here.\nReferences\n\nRFC, the ultimate reference\nJWT Debugger\n\n","id":"http://127.0.0.1:1111/jwt/","title":"JWT"},"http://127.0.0.1:1111/register-docs/":{"body":"POST request to /register endpoint\nLets a user to authenticate themselves to the system.\nOnly people who are enrolled to the class can open Gradecoin accounts.\nThis is enforced with your Student ID and a one time password you will receive.\nAuthentication Process\n\nGradecoin's Public Key (gradecoin_public_key) is listed on our Moodle page.\nYou pick a short temporary key (k_temp)\nCreate a JSON object (auth_plaintext) with your metu_id and public key in base64 (PEM) format (S_PK) reference\n\n{\n \"student_id\": \"e12345\",\n \"passwd\": \"15 char secret\",\n \"public_key\": \"---BEGIN PUBLIC KEY...\"\n}\n\n\nPick a random IV.\nEncrypt the serialized string of auth_plaintext with 128 bit block AES in CBC mode with Pkcs7 padding using the temporary key (k_temp), the result is auth_ciphertext. 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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.\nA quick summary: authenticate yourself to the system using public key encryption.\nCraft Transaction proposals and tag them using JWTs.\nWhen there are enough transactions then you can propose Blocks in the same way.\nBlocks need to be mined beforehand using Proof-of-work, or brute force.\nGradecoin offers 3 endpoints at /register, /block and /transaction. You can only send GET requests to /block and /transaction without authorization.\nThe server is programmed in RESTful architecture, there are no DELETE, PUT or UPDATE operations, though.\nGradecoin uses a Proof-of-work block accepting mechanism. It uses single round Blake2s hashing which produces 256-bit (64 hexadecimal characters) output. The target hash is 24 bits or 6 hexadecimal characters of 0. During testing, I could mine a block on average around 2-7 minutes.\n\nWe're expecting you to use existing tools and implementations. Standards are hard. Don't roll your own crypto. Feel free to ask questions. Collaborate.\n\nYou might ask,\n\nBut if nobody has any Gradecoin then how do we have transactions?\n\nThere is a bank! Their public key is 31415926535897932384626433832795028841971693993751058209749445923 and they have some amount of Gradecoin preloaded. It's also the only account that you can send transactions requests to yourself.\nCoinbase\nThe first transactions of a block is called the coinbase. They are the author of the block proposal and if the block is accepted then they get compensated for their efforts with some Gradecoin.\nPublic Key Signatures\nGradecoin uses 2048 bit RSA keyspairs.\nServices\n/register\n\nStudent creates their own 2048 bit RSA keypair\nDownloads Gradecoin's Public Key from Moodle\nEncrypts their JSON wrapped Public Key, Student ID and one time passwd using Gradecoin's Public Key\nTheir public key is now in our database and can be used to sign their JWT's during requests\n\n/transaction\n\nYou can offer a Transaction - POST request\n\nThe request should have Authorization\nThe request header should be signed by the Public Key of the by field in the transaction\n\n\nfetch the list of Transactions - GET request\n\n/block\n\noffer a [schema::Block] - POST request\n\nThe request should have Authorization\nThe [schema::Block::transaction_list] of the block should be a subset of [schema::Db::pending_transactions]\n\n\nfetch the last accepted [schema::Block] - GET request\n\nAuthorization: The request header should have Bearer JWT.Token signed with Student Public Key\nQuestions\nThis all sound complicated!\n\nI've drawn inspiration from actual Bitcoin transactions and warp. The simplicity of the system is how little interfaces it has.\nDon't know where to start? Gradecoin uses RESTful API; simple curl commands or even your browser will work! This website can help as well.\nJWT Debugger and the corresponding RFC\nRemember 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?\n\nI found a bug!\nThank you! Please let me know so we can solve it.\nI hacked the server!\nThat 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.\nSubmission?\nAt the end of the simulation, your Gradecoin balance will be your grade. I will also expect a unique client programmed in either;\n\nc\nc++\nperl\nrust\npython\nrandom assortment of bash scripts\n\nIf your favourite programming language is missing please let me know 🤷?\nCan my friends play?\nSadly, no. Student's who are enrolled to the class will receive one-time-passwords for authentication.\nHow and or Why?\n\nBuilt, with Rust\n\n","id":"https://gradecoin.xyz/","title":"Gradecoin"},"https://gradecoin.xyz/block-docs/":{"body":"A block that was proposed to commit Transactions in transaction_list to the\nledger with a nonce that made hash valid; 6 zeroes at the left hand side of the\nhash (24 bytes).\nWe are mining using blake2s algorithm, which produces 256 bit hashes. Hash/second is roughly 20x10^3 on my machine, a new block can be mined in around 4-6 minutes.\nRequests\nGET\nA HTTP GET request to /block endpoint will return the latest mined block.\nPOST\nA HTTP POST request with Authorization using JWT will allow you to propose your own blocks.\nFields\ntransaction_list: [array of Fingerprints]\nnonce: unsigned 32-bit integer\ntimestamp: ISO 8601 &lt;date&gt;T&lt;time&gt;\nhash: String\n\nISO 8601 Reference\n","id":"https://gradecoin.xyz/block-docs/","title":"Blocks"},"https://gradecoin.xyz/jwt/":{"body":"\nJSON Web Tokens are representations of claims, or authorization proofs that fit into the Header of HTTP requests.\n\nHow?\nJWTs are used as the MAC of operations that require authorization:\n\nblock proposal\ntransaction proposal.\n\nThey are send alongside the JSON request body in the Header;\nAuthorization: Bearer aaaaaa.bbbbbb.ccccc\n\nGradecoin uses 3 fields for the JWTs;\n{\n\"tha\": \"Hash of the payload, check invididual references\",\n\"iat\": \"Issued At, Unix Time\",\n\"exp\": \"Expiration Time, epoch\"\n}\n\n\ntha is explained in blocks and transactions documentations.\niat when the JWT was created in Unix Time format\nexp when the JWT will expire &amp; be rejected in Unix Time\n\nAlgorithm\nWe are using RS256, RSASSA-PKCS1-v1_5 using SHA-256. The JWTs you encode with your private RSA key will be decoded using the public key you have authenticated with. You can see how the process works here.\nReferences\n\nRFC, the ultimate reference\nJWT Debugger\n\n","id":"https://gradecoin.xyz/jwt/","title":"JWT"},"https://gradecoin.xyz/register-docs/":{"body":"POST request to /register endpoint\nLets a user to authenticate themselves to the system.\nOnly people who are enrolled to the class can open Gradecoin accounts.\nThis is enforced with your Student ID and a one time password you will receive.\nAuthentication Process\n\nGradecoin's Public Key (gradecoin_public_key) is listed on our Moodle page.\nYou pick a short temporary key (k_temp)\nCreate a JSON object (auth_plaintext) with your metu_id and public key in base64 (PEM) format (S_PK) reference\n\n{\n \"student_id\": \"e12345\",\n \"passwd\": \"15 char secret\",\n \"public_key\": \"---BEGIN PUBLIC KEY...\"\n}\n\n\nPick a random IV.\nEncrypt the serialized string of auth_plaintext with 128 bit block AES in CBC mode with Pkcs7 padding using the temporary key (k_temp), the result is auth_ciphertext. Encode this with base64.\nThe temporary key you have picked k_temp is encrypted using RSA with OAEP padding scheme\nusing SHA-256 with gradecoin_public_key, giving us key_ciphertext. Encode this with base 64.\nThe payload JSON object (auth_request) can be serialized now:\n\n{\n \"c\": \"auth_ciphertext\",\n \"iv\": \"hexadecimal\",\n \"key\": \"key_ciphertext\"\n}\n\nIf your authentication process was valid, you will be given access and your public key fingerprint that is your address.\n","id":"https://gradecoin.xyz/register-docs/","title":"Register"},"https://gradecoin.xyz/transaction-docs/":{"body":"A transaction request between source and target to move amount Gradecoin.\nRequests\nGET\nA HTTP GET request to /transaction endpoint will return the current list of pending transactions.\nPOST\nA HTTP POST request with Authorization using JWT to /transaction will allow you to propose your own transactions.\nFields\nby: Fingerprint\nsource: Fingerprint\ntarget: Fingerprint\namount: unsigned 16 bit integer\ntimestamp: ISO 8601 &lt;date&gt;T&lt;time&gt;\n","id":"https://gradecoin.xyz/transaction-docs/","title":"Transactions"}},"docInfo":{"https://gradecoin.xyz/":{"body":371,"title":1},"https://gradecoin.xyz/block-docs/":{"body":74,"title":1},"https://gradecoin.xyz/jwt/":{"body":96,"title":1},"https://gradecoin.xyz/register-docs/":{"body":121,"title":1},"https://gradecoin.xyz/transaction-docs/":{"body":44,"title":1}},"length":5},"lang":"English"}; \ No newline at end of file
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41 Gradecoin
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47 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;register-docs&#x2F;">Register</a>
48
49 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;jwt&#x2F;">JWT</a>
50
51 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;transaction-docs&#x2F;">Transactions</a>
52
53 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;block-docs&#x2F;">Blocks</a>
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71 <div class="toc">
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74 <div class="toc-item">
75 <a class="subtext" href="https://gradecoin.xyz/transaction-docs/#requests">Requests</a>
76 </div>
77
78
79 <div class="toc-item-child">
80 <a class="subtext" href="https://gradecoin.xyz/transaction-docs/#get"><small>- GET</small></a>
81 </div>
82
83 <div class="toc-item-child">
84 <a class="subtext" href="https://gradecoin.xyz/transaction-docs/#post"><small>- POST</small></a>
85 </div>
86
87
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89 <div class="toc-item">
90 <a class="subtext" href="https://gradecoin.xyz/transaction-docs/#fields">Fields</a>
91 </div>
92
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94 </div>
95 </div>
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99 <div class="content text">
100
101<div class="heading-text">Transaction documentation</div>
102<p>A transaction request between <code>source</code> and <code>target</code> to move <code>amount</code> Gradecoin.</p>
103<h1 id="requests">Requests</h1>
104<h2 id="get">GET</h2>
105<p>A HTTP <code>GET</code> request to <a href="/transaction">/transaction</a> endpoint will return the current list of pending transactions.</p>
106<h2 id="post">POST</h2>
107<p>A HTTP <code>POST</code> request with Authorization using JWT to <a href="/transactions">/transaction</a> will allow you to propose your own transactions.</p>
108<h1 id="fields">Fields</h1>
109<pre style="background-color:#ffffff;">
110<code><span style="color:#545052;">by: Fingerprint
111source: Fingerprint
112target: Fingerprint
113amount: unsigned 16 bit integer
114timestamp: ISO 8601 &lt;date&gt;T&lt;time&gt;
115</span></code></pre>
116
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