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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="learn.js" async></script>
<link rel="stylesheet" href="indexStyle.css">
<link rel="Shortcut Icon" type="image/x-icon" href="img/home.ico" />
<link href="https://fonts.googleapis.com/css2?family=Noto+Serif+TC:wght@600&display=swap" rel="stylesheet">
<link href="https://fonts.googleapis.com/css2?family=Rock+Salt&display=swap" rel="stylesheet">
<link href="https://fonts.googleapis.com/css2?family=Noto+Serif+TC:wght@600&display=swap" rel="stylesheet">
<link href="https://fonts.googleapis.com/css2?family=Bodoni+Moda:wght@500&display=swap" rel="stylesheet">
<link rel="preconnect" href="https://fonts.gstatic.com">
<link href="https://fonts.googleapis.com/css2?family=Mr+De+Haviland&display=swap" rel="stylesheet">
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=Rosario:wght@600&display=swap" rel="stylesheet">
<link href="https://fonts.googleapis.com/css2?family=Alice&display=swap" rel="stylesheet">
<title>InfoSec Learning</title>
<style>
footer{
display: block;
clear:both;
bottom: 0;
padding:5px;
text-align:center;
font-family: 'Noto Serif TC', serif;
}
p{
font-family: 'Noto Serif TC', serif;
font-size: 130%;
}
body{
margin-right:2em;
margin-left:2em;
}
</style>
</head>
<body style="background-color: #BCB8B1;" >
<br><br>
<header>
<div class="navbar">
<a href="index.html"><img src="img/logo.png" class="logo"></a>
<nav>
<ul>
<li><a href="index.html">Home</a></li>
<li><a href="learn.html">Learning</a></li>
<li><a href="game.html">InfoSec Game</a></li>
<li><a href="html/about.html">About</a></li>
</ul>
</nav>
</div>
</header>
<h1 class="title">Information Security Knowledge</h1>
<div id="top" class="navbar">
<nav>
<ul style="text-align: right;">
<li class="title-a" style="width: 10%; text-align: center;">Navbar</li><br><br><br>
<li><a href="learn.html#P1">Plain text and Cipher text</a></li><br><br>
<li><a href="learn_2.html#P2">Cryptography</a></li><br><br>
<li><a href="learn_3.html#P3">This is password.</a></li><br><br>
<li><a href="learn_4.html#P4">Buffer Overflow</a></li><br><br>
<li><a href="learn_5.html#P5">Cross-Site Scripting</a></li><br><br>
<li><a href="learn_6.html#P6">Forensics</a></li><br><br>
</ul>
</nav>
</div>
<h1 id="P2" class="title-f">Cryptography</h1>
 <a href="#top"><img src="img/caret-quare-up.png" alt=""></a>
<div class="container">
<div class="box" style="width: 55%;">
<h1 class="title-a">ROT13</h1><br>
<p style="text-align: left;">
<br>
  ROT13 是一種位移值為13的簡單型替換式密碼演算法。由於其加密方式十分簡單易懂，適合密碼學初學者學習概念使用；
並不常使用於實務，而目前常使用的算法為<a class="word" href="#RSA">RSA</a>
及基於ECC<a target="_blank" href="https://ithelp.ithome.com.tw/articles/10251031"><sub>[1]</sub></a>
的ECDSA<a target="_blank" href="https://medium.com/cryptocow/%E6%A9%A2%E5%9C%93%E6%9B%B2%E7%B7%9A%E5%8A%A0%E5%AF%86%E6%BC%94%E7%AE%97%E6%B3%95-ecdsa-%E8%88%87-rfc6979-%E6%94%B9%E9%80%B2%E6%8F%90%E6%A1%88-dabeea17a8e3"><sub>[2]</sub></a>常用於數位簽章，其都含有數學難題的性質來保全其安全性。<br><br>
  此外，ROT13只對字母進行變換，其他字元不受加密。因此，衍伸出變形<a class="word" href="https://www.dcode.fr/rot-47-cipher" target="_blank">ROT47</a>，使用ASCII code 來進行變化。<br><br>
  ROT13(rotate by 13 places) is a algorithm of substitution cipher. The shift value is 13.<br>
</p>
</div>
</div>
<div class="container">
<div class="box">
<p style="align-content: center; margin-bottom: 3%;margin-top: 3%;">
<div class="box">
<p>
<img src="img/function.png" alt="" style="margin-top: 2%;"><br>
<p style="background-color: #999999;width: 50%;margin-left: 25%;">
<span style="color: white;margin-top: 3%; font-size: 150%;font-weight: 700;">Simulation</span><br>
<span style="color: white;">Enter your string:</span>
<input type="text" id="rot13_input"><br>
<span style="color: white;">Result: :</span>
<input type="text" style="color: red;" id="rot13_output" disabled="disabled"><br><br>
<button style="margin-left: 36%;font-size: 120%;" class="button" onclick="rot13();">submit</button>
</p>
</p>
</div>
<img class="img-rot13" src="img/rot13.png" alt="" width="40%">
</p>
</div>
</div>
<div class="container">
<div class="box" style="width: max-content;">
<h1 class="title-a" id="RSA">RSA</h1>
<p style="width: 70%; align-content: center; margin-bottom: 3%;margin-top: 3%;">
Ref: <a target="_blank" href="https://ithelp.ithome.com.tw/articles/10250721">[3]</a>
<ol style="text-align: left;list-style: upper-roman;font-size: 120%;">
<li><p id="rsa1">選出兩個較大的質數 p 和 q</p></li><br>
<li><p id="rsa2">計算兩個質數的乘積 n = p × q</p></li><br>
<li><p id="rsa3">計算出小於 n 且與 n 互質的整數個數  φ (n)= (p - 1)(q - 1)</p></li><br>
<li>
<p id="rsa4">選出一個整數 e（拿來當做公鑰)</p>
<img src="img/r1.png" alt="">
</li><br>
<li><p id="rsa5">計算 d (私鑰)</p>
<img src="img/r2.png" alt="">
</li><br>
<li><p>可得</p><img src="img/r3.png" alt=""></li><br>
</ol>
</p>
</div>
</div>
<div class="container">
<div class="box" style="width: 100%;">
<p>
<p style="background-color: #999999;width: 50%;margin-left: 25%;">
<span style="color: white;margin-top: 3%; font-size: 150%;font-weight: 700;">Simulation</span><br>
<span style="color: white;">Enter your a>0 <i>prime</i> number P:</span>
<input type="number" placeholder="prime" style="width: 20%;" id="rsaNum_p"><br>
<span style="color: white;">Enter your a>0 <i>prime</i> number Q:</span>
<input type="number" placeholder="prime" style="width: 20%;" id="rsaNum_q"><br>
⇩ 如下開始模擬RSA金鑰的產生過程 ⇩<br><br>
<span id="rsa_process"></span>
<span style="color: white;">Plain Text:</span>
<input type="number" style="color: red;" id="rsa_input" ><br><br>
<span style="color: white;">Cipher Text:</span>
<input type="text" style="color: red;" id="rsa_output" disabled="disabled"><br><br>
<button style="margin-left: 36%;font-size: 120%;" class="button" onclick="rsa();">submit</button>
</p>
</p>
</div>
</div>
<p style="text-align: right">
返回top <a href="#top"><img src="img/caret-quare-up.png" alt=""></a>
</p>
<br><br><br>
<footer>
<p><small>
<font size="5" face="serif">Takeda <br><a rel="license" href="http://creativecommons.org/licenses/by-nc/3.0/tw/"><img alt="創用 CC 授權條款" style="border-width:0" src="https://i.creativecommons.org/l/by-nc/3.0/tw/88x31.png" /><a href=""></a><br>2021</font>
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