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<a class="subtext" href="https://gradecoin.xyz/register-docs/#authentication-process">Authentication Process</a>
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<div class="heading-text">Register Documentation</div>
<p>POST request to /register endpoint</p>
<p>Lets a user to authenticate themselves to the system.
Only people who are enrolled to the class can open Gradecoin accounts.
This is enforced with your Student ID and a one time password you will receive.</p>
<h1 id="authentication-process">Authentication Process</h1>
<ul>
<li>Gradecoin's Public Key (<code>gradecoin_public_key</code>) is listed on our Moodle page.</li>
<li>You pick a short temporary key (<code>k_temp</code>)</li>
<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>
</ul>
<pre style="background-color:#ffffff;">
<code class="language-json" data-lang="json"><span style="color:#545052;">{
"</span><span style="color:#009854;">student_id</span><span style="color:#545052;">": "</span><span style="color:#009854;">e12345</span><span style="color:#545052;">",
"</span><span style="color:#009854;">passwd</span><span style="color:#545052;">": "</span><span style="color:#009854;">15 char secret</span><span style="color:#545052;">",
"</span><span style="color:#009854;">public_key</span><span style="color:#545052;">": "</span><span style="color:#009854;">---BEGIN PUBLIC KEY...</span><span style="color:#545052;">"
}
</span></code></pre>
<ul>
<li>Pick a random IV.</li>
<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>
<li>The temporary key you have picked <code>k_temp</code> is encrypted using RSA with OAEP padding scheme
using SHA-256 with <code>gradecoin_public_key</code>, giving us <code>key_ciphertext</code>. Encode this with base 64.</li>
<li>The payload JSON object (<code>auth_request</code>) can be serialized now:</li>
</ul>
<pre style="background-color:#ffffff;">
<code class="language-json" data-lang="json"><span style="color:#545052;">{
"</span><span style="color:#009854;">c</span><span style="color:#545052;">": "</span><span style="color:#009854;">auth_ciphertext</span><span style="color:#545052;">",
"</span><span style="color:#009854;">iv</span><span style="color:#545052;">": "</span><span style="color:#009854;">hexadecimal</span><span style="color:#545052;">",
"</span><span style="color:#009854;">key</span><span style="color:#545052;">": "</span><span style="color:#009854;">key_ciphertext</span><span style="color:#545052;">"
}
</span></code></pre>
<p>If your authentication process was valid, you will be given access and your public key fingerprint that is your address.</p>
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Built For ⁂ CENG489 ⁂ Introduction to Computer Security
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