kripto: Added tugas 1.
Signed-off-by: Willy Sudiarto Raharjo <willysr@gmail.com>
This commit is contained in:
Willy Sudiarto Raharjo
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<?php
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if ($_SERVER['REQUEST_METHOD'] == "POST") // Cek apakah halaman diload melalui metode POST?
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{
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include "functions.php"; // Untuk fungsi produce_error
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$inputPlainText = strip_tags($_POST['plaintext']);
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if (empty($inputPlainText)) // Cek apakah ada plaintext?
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{
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produce_error("Input plaintext masih kosong");
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return;
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}
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$inputKey = strip_tags($_POST['key']);
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if (empty($inputKey)) // Cek apakah ada kunci?
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{
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produce_error("Input kunci masih kosong");
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return;
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}
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$plainTextLength = strlen($inputPlainText); // ambil panjang karakter plaintext
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$keyLength = strlen($inputKey); // ambil panjang kunci
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if (preg_match("/[^a-zA-Z]/",$inputPlainText) || preg_match("/[^a-zA-Z]/",$inputKey)) // Jika ada karakter selain alphabet
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{
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produce_error("Terdapat karakter selain alphabet");
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return;
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}
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// Tampilkan struktur dasar HTML
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echo "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" \"http://www.w3c.org/TR/html4/loose.dtd\">\n";
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echo "<html>\n";
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echo "<head>\n";
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echo "<title>Willy Sudiarto Raharjo - Tugas 2 Keamanan Komputer - Semester Gasal 2016/2017</title>\n";
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echo "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=iso-8859-1\">\n";
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echo "<meta name=\"author\" content=\"Willy Sudiarto Raharjo\">\n";
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echo "<style type=\"text/css\">\n";
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echo "@import url(index.css);\n";
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echo "</style>\n";
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echo "</head>\n";
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echo "<body>\n";
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echo "<div class=\"Result-Title\">\n";
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echo "Hasil Enkripsi: \n";
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echo "</div>\n";
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$resultingCipherText = "";
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echo "plaintext: $inputPlainText<br/>";
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echo "kunci: $inputKey<br/>";
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/*
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/* Pergeseran sebanyak panjang kunci
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*/
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for ($i = 0; $i < $keyLength; $i++)
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{
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/*
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/* Jika loop pertama, gunakan input awal
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/* Jika bukan loop pertama, gunakan hasil perhitungan sebelumnya
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*/
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if ($i == 0)
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{
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$originalPlainText = $inputPlainText;
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}
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else
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{
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$originalPlainText = $resultingCipherText;
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}
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/*
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/* Jumlah pergeseran dari karakter ke-i dari kunci
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/* Hasilnya dikurangi 97 karena karakter a kode ASCInya 97
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/* Kita ingin a = 0, b = 1, c = 2, dst
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*/
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$numberOfMovement = ord($inputKey[$i]) - 97;
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echo "Karakter ke-" . ($i+1) . " kunci - ";
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/*
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/* Pergeseran sebanyak panjang plaintext
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*/
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for ($j = 0; $j < $plainTextLength; $j++)
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{
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/*
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/* Algoritma:
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/* 1. Ambil kode ASCII dari teks menggunakan fungsi ord
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/* 2. Konversi ke bilangan 0 - 25 dengan mengurangi 97
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/* 3. Tambahkan jumlah pergeseran dari karakter ke-i dari kunci
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/* 4. Pastikan hasilnya diantara 0-25 dengan cara modulus 26
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/* 5. Kembalikan hasilnya ke karakter ASCII dengan fungsi chr
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*/
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$originalPlainText[$j] = chr((((ord($originalPlainText[$j]) - 97) + $numberOfMovement) % 26) + 97);
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echo $originalPlainText[$j];
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}
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echo "<br/>\n";
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/*
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/* Simpan hasilnya ke variabel resultingCipherText untuk nilai awal loop berikutnya
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*/
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$resultingCipherText = $originalPlainText;
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}
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echo "ciphertext: <strong>$resultingCipherText</strong>";
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echo "<div class=\"Link\">\n";
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echo ":: <a href=\"index.php\" class=\"url\">Kembali ke halaman input</a> ::\n";
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echo "</div>\n";
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echo "<div class=\"Info\">\n";
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echo "Willy Sudiarto Raharjo\n";
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echo "</div>\n";
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echo "</body>\n";
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echo "</html>\n";
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}
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else // Jika ternyata diakses melalui metode GET (kemungkinan besar pemanggilan langsung)
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{
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header("location:index.php"); // Redirect ke halaman input
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exit; // hanya memastikan bahwa tidak menjalankan perintah lain
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}
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?>
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Executable
+29
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<?php
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function produce_error($string)
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{
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echo "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" \"http://www.w3c.org/TR/html4/loose.dtd\">\n";
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echo "<html>\n";
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echo "<head>\n";
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echo "<title>Willy Sudiarto Raharjo - Tugas 2 Keamanan Komputer - Semester Gasal 2016/2017</title>\n";
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echo "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=iso-8859-1\">\n";
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echo "<meta name=\"author\" content=\"Willy Sudiarto Raharjo\">\n";
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echo "<style type=\"text/css\">\n";
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echo "@import url(index.css);\n";
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echo "</style>\n";
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echo "</head>\n";
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echo "<body>\n";
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echo "<div class=\"Error-Title\">\n";
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echo "Kesalahan\n";
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echo "</div>\n";
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echo "<div class=\"Error-Notes\">\n";
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echo $string . "\n";
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echo "</div>\n";
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echo "<div class=\"Link\">\n";
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echo ":: <a href=\"index.php\" class=\"url\">Kembali ke halaman input</a> ::\n";
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echo "</div>\n";
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echo "<div class=\"Info\">\n";
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echo "Willy Sudiarto Raharjo\n";
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echo "</div>\n";
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echo "</body>\n";
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echo "</html>\n";
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}
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Executable
+112
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body {
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margin: 0.5em 0.5em;
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font-family: Serif;
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font-size: 12pt;
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text-align: justify;
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background-color: #FFF;
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color: #000;
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}
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.Title, .Info, .Result-Title {
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border-top: 2px solid #000;
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border-bottom: 2px solid #000;
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text-align: center;
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font-weight: bold;
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font-size: 14pt;
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margin-bottom: 1em;
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background: #d8e4f1;
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}
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form {
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font-weight: bold;
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font-size: 2em;
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}
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textarea:focus {
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background: #C4E7F4;
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}
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input {
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margin-top: 1em;
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}
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.Notes-Title {
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color: #F00;
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font-size: 1.33em;
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}
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.Notes {
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line-height: 1.33em;
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word-spacing: 1px;
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}
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li {
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font-weight: bold;
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line-height: 1.5em;
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}
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.Link {
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margin-top: 1em;
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margin-bottom: 2em;
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text-align: center;
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font-family: Sans-Serif;
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font-weight: bold;
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font-size : 14px;
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}
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p {
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margin: 0;
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padding-top: 0.5em;
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font-weight: bold;
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}
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div.result {
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padding-bottom: 0.5em;
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border-bottom: 2px solid #558864;
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}
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a {
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text-decoration:none;
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color: #4064FE;
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}
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a.url:link {
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color: #4064FE;
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}
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a.url:visited {
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color: #4064FE;
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}
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a.url:hover {
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text-decoration: underline;
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color: #4064FE;
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}
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a.url:active {
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text-decoration: underline;
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color: #4064FE;
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}
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.Error-Title {
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border-top: 2px solid #F00;
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border-bottom: 2px solid #F00;
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text-align: center;
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font-weight: bold;
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font-size: 14pt;
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color: #FFF;
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margin-bottom: 1em;
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background: #F00;
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}
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.Error-Notes {
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text-align: center;
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color: #F00;
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font-size: 16pt;
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}
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.LastUpdate {
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font-size: 80%;
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margin-top: 1em;
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text-align: right;
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}
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@@ -0,0 +1,89 @@
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3c.org/TR/html4/loose.dtd">
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<html>
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<head>
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<title>Willy Sudiarto Raharjo - Tugas 1 Kriptografi - Semester Gasal 2023/2024</title>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta name="author" content="Willy Sudiarto Raharjo">
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<style type="text/css">
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@import url(index.css);
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</style>
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</head>
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<body>
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<div class="Title">
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TUGAS 1 KRIPTOGRAFI SEMESTER GASAL 2023/2024
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</div>
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<p>Anda diminta untuk membuat sebuah program yang bisa menerima input berupa plaintext dan mengubahnya menjadi ciphertext dengan ketentuan sebagai berikut:</p>
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<ol>
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<li>Input berupa plain ASCII huruf kecil (a-z) tanpa ada angka dan spasi</li>
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<li>Seluruh isi teks akan diproses per karakter kunci
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<ul>
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<li>Kunci A berarti tidak ada perubahan</li>
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<li>Kunci B berarti geser 1 posisi (a->b, b->c, z->a, dst)</li>
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<li>Kunci C berarti geser 2 posisi (a->c, b->d, z->b, dst)</li>
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<li>dan seterusnya</li>
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</ul>
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</li>
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</ol>
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Contoh:
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<pre>
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Plaintext: aku
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Kunci: diam
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Output:
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Karakter ke-1 kunci: dnx (d)
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Karakter ke-2 kunci: lvf (i)
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Karakter ke-3 kunci: lvf (a)
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Karakter ke-4 kunci: xhr (m)
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ciphertext: <strong>xhr</strong></pre>
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<form action="check.php" method="POST">
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Input Plaintext: <br />
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<textarea cols="60" rows="10" name="plaintext"></textarea><br />
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Input Kunci: <br/>
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<input type="text" name="key"></input><br/>
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<input type="submit" name="submit" value="Encrypt">
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</form>
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<div class="Notes-Title">
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Catatan :
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</div>
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<div class="Notes">
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<ol>
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<li>Input boleh huruf besar/kecil</li>
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<li>Input hanya berupa alphabet</li>
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<li>Input tidak boleh mengandung spasi</li>
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</ol>
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</div>
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<p class="LastUpdate">
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<?php
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$filename = 'index.php';
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if (file_exists($filename))
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{
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date_default_timezone_set("Asia/Jakarta");
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$tanggal = date("d", filemtime($filename));
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if (substr($tanggal,0,1)==0)
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$tanggal=substr($tanggal,-1);
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$bulan = date("m", filemtime($filename));
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switch ($bulan)
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{
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case 1 : $bulan_id="Januari"; break;
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case 2 : $bulan_id="Februari"; break;
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case 3 : $bulan_id="Maret"; break;
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case 4 : $bulan_id="April"; break;
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case 5 : $bulan_id="Mei"; break;
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case 6 : $bulan_id="Juni"; break;
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case 7 : $bulan_id="Juli"; break;
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case 8 : $bulan_id="Agustus"; break;
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case 9 : $bulan_id="September"; break;
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case 10 : $bulan_id="Oktober"; break;
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case 11 : $bulan_id="November"; break;
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case 12 : $bulan_id="Desember"; break;
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}
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$tahun = date("Y", filemtime($filename));
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$jam = date("H:i:s", filemtime($filename));
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echo "Update Terakhir : " . $tanggal . " " . $bulan_id . " " . $tahun . " :: " . $jam . "\n";
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}
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?>
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</p>
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<div class="Info">
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Willy Sudiarto Raharjo
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</div>
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</body>
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</html>
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