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![• for($i = 0; $i < strlen($str); $i++){
• //ord function in php char to ascii
• $code = ord($str[$i]) + $rot;
• // check function if code ascii > 90
• if ($code > 90) {
• $code = ($code - 90) + 64;
• }
• //chr function in php ascii to char
• echo chr($code);
• }
prepared by Agung Julisman](https://image.slidesharecdn.com/substitutioncipher-140716031744-phpapp02/75/Substitution-Cipher-5-2048.jpg)
![• <html>
• <head>
• <title>Fungsi terbilang</title>
• </head>
• <body>
• <form action="terbilang.php" method="post">
• Masukkan angka: <input type="text" value="" name="angka">
• <input type="submit" value="Send">
• </form>
• <pre>
• <?php
• $angka = isset($_POST['angka']) ? $_POST['angka'] : "0";
• if ($angka)
• {
• echo number_format($angka, 0) . "<br>";
• echo ucwords(Terbilang($angka));
• }
• ?>
• </pre>
• </body>
• </html>
• <?php
• function Terbilang($x)
• {
• $abil = array("", "satu", "dua", "tiga", "empat", "lima", "enam", "tujuh", "delapan", "sembilan", "sepuluh", "sebelas");
• if ($x < 12)
• return " " . $abil[$x];
• elseif ($x < 20)
• return Terbilang($x - 10) . "belas";
• elseif ($x < 100)
• return Terbilang($x / 10) . " puluh" . Terbilang($x % 10);
• elseif ($x < 200)
• return " seratus" . Terbilang($x - 100);
• elseif ($x < 1000)
• return Terbilang($x / 100) . " ratus" . Terbilang($x % 100);
• elseif ($x < 2000)
• return " seribu" . Terbilang($x - 1000);
• elseif ($x < 1000000)
• return Terbilang($x / 1000) . " ribu" . Terbilang($x % 1000);
• elseif ($x < 1000000000)
• return Terbilang($x / 1000000) . " juta" . Terbilang($x % 1000000);
• }
• ?>
prepared by Agung Julisman](https://image.slidesharecdn.com/substitutioncipher-140716031744-phpapp02/75/Substitution-Cipher-6-2048.jpg)
Uploaded byAgung Julisman
Substitution Cipher
The document outlines basic principles of simple substitution encryption, specifically the Caesar cipher and its adaptations, such as the Atbash cipher and modern applications like ROT13. It includes example PHP code demonstrating how to implement Caesar cipher encryption and a function for converting numbers into their word form in Indonesian. The document also notes that single alphabet substitution ciphers, including the Caesar cipher, are vulnerable to decryption and lack modern communication security.
Substitution Cipher
- 1. Prepared by AgungJulisman
- 2. • Definition Simplesubstitution • Caesar cipher • Algorithm • Demo prepared by Agung Julisman
- 3. • Substitution ofsingle letters separately—simple substitution—can be demonstrated by writing out the alphabet in some order to represent the substitution. This is termed a substitution alphabet. The cipher alphabet may be shifted or reversed (creating the Caesar and Atbash ciphers, respectively) prepared by Agung Julisman
- 4. • The encryptionstep performed by a Caesar cipher is often incorporated as part of more complex schemes, such as the Vigenère cipher, and still has modern application in the ROT13 system. As with all single alphabet substitution ciphers, the Caesar cipher is easily broken and in modern practice offers essentially no communication security. prepared by Agung Julisman
- 5. • for($i =0; $i < strlen($str); $i++){ • //ord function in php char to ascii • $code = ord($str[$i]) + $rot; • // check function if code ascii > 90 • if ($code > 90) { • $code = ($code - 90) + 64; • } • //chr function in php ascii to char • echo chr($code); • } prepared by Agung Julisman
- 6. • <html> • <head> •<title>Fungsi terbilang</title> • </head> • <body> • <form action="terbilang.php" method="post"> • Masukkan angka: <input type="text" value="" name="angka"> • <input type="submit" value="Send"> • </form> • <pre> • <?php • $angka = isset($_POST['angka']) ? $_POST['angka'] : "0"; • if ($angka) • { • echo number_format($angka, 0) . "<br>"; • echo ucwords(Terbilang($angka)); • } • ?> • </pre> • </body> • </html> • <?php • function Terbilang($x) • { • $abil = array("", "satu", "dua", "tiga", "empat", "lima", "enam", "tujuh", "delapan", "sembilan", "sepuluh", "sebelas"); • if ($x < 12) • return " " . $abil[$x]; • elseif ($x < 20) • return Terbilang($x - 10) . "belas"; • elseif ($x < 100) • return Terbilang($x / 10) . " puluh" . Terbilang($x % 10); • elseif ($x < 200) • return " seratus" . Terbilang($x - 100); • elseif ($x < 1000) • return Terbilang($x / 100) . " ratus" . Terbilang($x % 100); • elseif ($x < 2000) • return " seribu" . Terbilang($x - 1000); • elseif ($x < 1000000) • return Terbilang($x / 1000) . " ribu" . Terbilang($x % 1000); • elseif ($x < 1000000000) • return Terbilang($x / 1000000) . " juta" . Terbilang($x % 1000000); • } • ?> prepared by Agung Julisman