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<!DOCTYPE html>
<html xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>@lea</title>
        <meta name="author" content="Marion CHARDON for ESC/RISET - University of Lausanne" />
        <meta name="description" content="Free Web tool for guess data" />
        <meta name="keywords" content="Cipher, Bigdata, Guess" />
        <meta charset="UTF-8" />
        <link rel="stylesheet" href="js/bootstrap/bootstrap.min.css" />
        <link rel="stylesheet" href="js/bootstrap/dashboard.css" />
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        <link rel="stylesheet" href="js/bootstrap/logo_unil.css" />
        <link rel="stylesheet" href="../css/main.css" />
        <script src="js/jquery/jquery-3.2.1.min.js"></script>
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    </head>
    <body>
        <nav class="navbar navbar-inverse navbar-fixed-top" role="navigation">
            <div class="container">
                <div class="navbar-header">
                    <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
                        <span class="sr-only">Toggle navigation</span>
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                    </button>
                    <a class="navbar-brand" href="../index.html"><img src="../img/g3761.png" alt="" style="height:28px;display: inline;"/>Cryptex - @lea</a>
                </div>
                <div id="navbar" class="navbar-collapse collapse">
                    <ul class="nav navbar-nav navbar-right">
                        <li><a href="help.html">Help</a></li>
                    </ul>
                </div>
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        </nav>   
        <div class="container" style="margin-bottom: 70px; margin-top: 20px;">
            <div class="row">
                <div class="col-sm-3">
                    <ul class="nav nav-pills nav-stacked">
                        <li><a href="index.html">Step 1: test your sequence</a></li>
                        <li><a href="pasapas.html">Step 2: test the computeur</a></li>
                        <li><a href="understand.html">Step 3: understand</a></li>
                        <li><a href="games.html">Game</a></li>
                    </ul>
                </div>
                <div class="col-sm-9" style="padding-left: 20px;">

                    <p>
                        Randomness is a mathematical notion that is used in many
                        modern life area. It is use in the form of a random sequence
                        in geolocalisation system, automatic gambling games, cryptology
                        and others. The mathematical definition of a ransom sequence
                        is still going under discussions, but certain properties
                        have been demonstrated and an agreement was found around three approaches: 
                    </p>
                    <ul>
                        <li>The frequency, measure-theoretic approach (Martin-Löf, 1966) (No random sequence should have exceptional regularity or be effectively testable).</li>
                        <li>The complexity, compressibility approach (Chaitin 1975) (A random sequence should be incompressible)</li>
                        <li>The predictability approach (Schnorr 1971) (A random sequence should be unpredictable)</li>
                    </ul>
                    <p>
                        From there, no random sequence can be generated from an 
                        algorithm. If so, the sequence will be considered as pseudorandom
                        and its level of randomness will depend from the context.
                    </p>
                    <p>
                        The sources of randomness can be separated into three
                        categories: unpredictable (dices, random sorting,…),
                        physical (radioactivity, electromagnetism,…), computational
                        (mix of physic and algorithms).
                    </p>
                    <p>
                        Another potential way is the human brain. Human decision
                        have been showed to be influenced by bias, but few studies
                        have been made on the human capacity to produce a random
                        sequence. To do so, the experience will ask the user
                        to write a sequence of numbers and to play with it,
                        the aim being to fool the computer.
                    </p>
                </div>

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