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1<!DOCTYPE html>
2<html lang="en">
3
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6 <title>Register | Gradecoin </title>
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42 Gradecoin
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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
56 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;misc-docs&#x2F;">Misc</a>
57
58
59
60 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;github.com&#x2F;zhuowei&#x2F;nft_ptr#why">why?</a>
61
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66
67
68 <main>
69
70
71
72
73
74 <div class="toc">
75 <div class="toc-sticky">
76
77 <div class="toc-item">
78 <a class="subtext" href="https://gradecoin.xyz/register-docs/#authentication-process">Authentication Process</a>
79 </div>
80
81
82 <div class="toc-item-child">
83 <a class="subtext" href="https://gradecoin.xyz/register-docs/#cipher-initialization"><small>- Cipher Initialization</small></a>
84 </div>
85
86 <div class="toc-item-child">
87 <a class="subtext" href="https://gradecoin.xyz/register-docs/#encryption"><small>- Encryption</small></a>
88 </div>
89
90
91
92 </div>
93 </div>
94
95
96
97 <div class="content text">
98
99<div class="heading-text">Register Documentation</div>
100<p>POST request to <code>/register</code> endpoint</p>
101<p>Lets a user to authenticate themselves to the system.
102Only people who are enrolled to the class can open Gradecoin accounts.
103This is enforced with your Student ID (e123456) and a one time password you will receive.</p>
104<h1 id="authentication-process">Authentication Process</h1>
105<blockquote>
106<p>The bytes you are sending over the network are all Base64 Encoded</p>
107</blockquote>
108<ul>
109<li>Gradecoin's Public Key (<code>gradecoin_public_key</code>) is listed on our Moodle page and <a href="/gradecoin.pub">here</a>. Download and load it it to your client.</li>
110<li>Create a JSON object (<code>P_AR</code>) with your <code>metu_id</code> (&quot;e&quot;+<code>6 chars</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>
111</ul>
112<pre style="background-color:#ffffff;">
113<code class="language-json" data-lang="json"><span style="color:#545052;">{
114 &quot;</span><span style="color:#009854;">student_id</span><span style="color:#545052;">&quot;: &quot;</span><span style="color:#009854;">e123456</span><span style="color:#545052;">&quot;,
115 &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;,
116 &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;
117}
118</span></code></pre><h2 id="cipher-initialization">Cipher Initialization</h2>
119<blockquote>
120<p>Since we are working with AES-128, both key and IV should be 128 bits (or 16 hexadecimal characters)</p>
121</blockquote>
122<ul>
123<li>Pick a short temporary key (<code>k_temp</code>)</li>
124<li>Pick a random IV <a href="https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Initialization_vector_(IV)">1</a> <a href="https://en.wikipedia.org/wiki/Initialization_vector">2</a> (<code>iv</code>).</li>
125</ul>
126<h2 id="encryption">Encryption</h2>
127<ul>
128<li>Encrypt the serialized string of <code>P_AR</code> with 128 bit block <a href="https://en.wikipedia.org/wiki/Initialization_vector">AES</a> in <a href="https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#CBC">CBC</a> mode with <a href="https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Padding">Pkcs7 padding</a> using the temporary key (<code>k_temp</code>), the result is <code>C_AR</code>. Encode this with base64.</li>
129<li>The temporary key you have picked <code>k_temp</code> is encrypted using RSA with <a href="https://en.wikipedia.org/wiki/Optimal_asymmetric_encryption_padding">OAEP</a> padding scheme using SHA-256 with <code>gradecoin_public_key</code>, giving us <code>key_ciphertext</code>. Encode this with base64.</li>
130<li>Base64 encode the IV (<code>iv</code>) as well.</li>
131</ul>
132<blockquote class="tidbit">
133 <p>
134 The available tools and libraries might warn you about how using the primitives given above are &quot;hazardous&quot;. They are, crypto is hard.
135 </p>
136</blockquote>
137<ul>
138<li>The payload JSON object (<code>auth_request</code>) can be serialized now:</li>
139</ul>
140<pre style="background-color:#ffffff;">
141<code class="language-json" data-lang="json"><span style="color:#545052;">{
142 &quot;</span><span style="color:#009854;">c</span><span style="color:#545052;">&quot;: &quot;</span><span style="color:#009854;">C_AR</span><span style="color:#545052;">&quot;,
143 &quot;</span><span style="color:#009854;">iv</span><span style="color:#545052;">&quot;: &quot;</span><span style="color:#009854;">iv</span><span style="color:#545052;">&quot;,
144 &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;
145}
146</span></code></pre>
147<p>If your authentication process was valid, you will be given access and your public key fingerprint that is your address.
148You can now sign <a href="https://gradecoin.xyz/jwt/">JWTs</a> to send authorized transaction requests.</p>
149
150
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158<footer>
159Built For ⁂ CENG489 ⁂ Introduction to Computer Security
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