Implementasi cipher dengan PHP

Kemarin kebetulan belajar keamanan informasi tentang enkripsi, dan di ajarkan beberapa enkripsi yaitu caesar cipher dan vigenere cipher. tiba tiba terfikir ingin mencoba membuat cipher dengan PHP, berhubung saya sedang menggemari bahasa tersebut. ya alhamdulillah setelah beberapa hari akhirnya jadi juga 😀

untuk menjelaskan programnya satu persatu, mungkin akan memakan banyak waktu, jadi saya cuma copas listing programnya saja, untuk penjelasan mengenail syntaxnya banyak sekali di temukan di Google atau di W3schools.

yang pertama buat file untuk convertnya, beri nama convert.php

<?php
/*
 *      convert.php
 *      
 *      Copyright 2011 Ahmad Zafrullah Mardiansyah <zaf@zaf-laptop>
 *      
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation; either version 2 of the License, or
 *      (at your option) any later version.
 *      
 *      This program is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *      GNU General Public License for more details.
 *      
 *      You should have received a copy of the GNU General Public License
 *      along with this program; if not, write to the Free Software
 *      Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 *      MA 02110-1301, USA.
 */
 
function char_to_dec($a){
	$i=ord($a);
	if ($i>=97 && $i<=122){
		return ($i-96);
	} else if ($i>=65 && $i<=90){
		return ($i-38);
	} else {
		return null;
	}
}

function dec_to_char($a){
	if ($a>=1 && $a<=26){
		return (chr($a+96));
	} else if ($a>=27 && $a<=52){
		return (chr($a+38));
	} else {
		return null;
	}
}

function tabel_vigenere_encrypt($a, $b){
	$i=$a+$b-1;
	if ($i>26){
		$i=$i-26;
	}
	return (dec_to_char($i));
}
function tabel_vigenere_decrypt($a, $b){
	$i=$a-$b+1;
	if ($i<1){
		$i=$i+26;
	}
	return (dec_to_char($i));
}

?>

kemudian untuk index.php nya

<?php
/*
 *      index.php
 *      
 *      Copyright 2011 Ahmad Zafrullah Mardiansyah <zaf@zaf-laptop>
 *      
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation; either version 2 of the License, or
 *      (at your option) any later version.
 *      
 *      This program is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *      GNU General Public License for more details.
 *      
 *      You should have received a copy of the GNU General Public License
 *      along with this program; if not, write to the Free Software
 *      Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 *      MA 02110-1301, USA.
 */
 
include "convert.php";

?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

<head>
	<title>cipher | 23Pstars</title>
	<meta http-equiv="content-type" content="text/html;charset=utf-8" />
	<meta name="generator" content="Geany 0.18" />
	<style type="text/css">
	a:link {color: #000000; text-decoration: none}
	a:visited {color: #000000; text-decoration: none}
	a:hover {color: #FF0000; text-decoration: underline}
	</style>
	<script type="text/javascript">
	function SelectAll(id){
		document.getElementById(id).focus();
		document.getElementById(id).select();
	}
	function Info(){
		alert("Original code by :"+'\n\n'+"Ahmad Zafrullah Mardiansyah");
	}
	function InfoCaesar(){
		alert("Key hanya berupa kombinasi angka,"+'\n'+"dan plan text tidak boleh mengandung angka!");
	}
	function InfoVigenere(){
		alert("Key hanya berupa kombinasi kata, tidak boleh mengandung angka,"+'\n'+"dan plan text tidak boleh mengandung angka!");
	}
	</script>
</head>

<body>
	<center>
	<h2>Simple cipher implementation with PHP</h2>
	<h4><a onclick="Info()">by 23Pstars</a></h4>
	</center>
	<table width="600" align="center">
	<tr><td width="50%" valign="top">
	<fieldset>
	<legend><b>Caesar</b></legend>
	<form action="" method="post">
	<input type="text" name="key_caesar" id="key_caesar" value="the key..." onclick="SelectAll('key_caesar')" />
	<input type="submit" value="?" onclick="InfoCaesar()" /><br/>
	<textarea rows="4" name="plantext_caesar" id="plantext_caesar" cols="33" onclick="SelectAll('plantext_caesar')" >plan text...</textarea><br/>
	<input type="submit" name="encrypt_caesar" value="Encrypt" /><input type="submit" name="decrypt_caesar" value="Decrypt" /><input type="reset" value="Reset" />
	</form>
	</fieldset>
	</td><td valign="top" colspan="3">
	<fieldset>
	<legend><b>Result</b></legend>
	<?php
	//----------------------------------------------------------------//
	// caesar														  //
	//----------------------------------------------------------------//
		if((isset($_POST['key_caesar'])) && (isset($_POST['plantext_caesar'])) && isset($_POST['encrypt_caesar'])){
			$key=$_POST['key_caesar'];
			$plantext=$_POST['plantext_caesar'];
			$split_key=str_split($key);
			$i=0;
			$split_chr=str_split($plantext);
			while ($key>52){
				$key=$key-52;
			}
			foreach($split_chr as $chr){
				if (char_to_dec($chr)!=null){
					$split_nmbr[$i]=char_to_dec($chr);
				} else {
					$split_nmbr[$i]=$chr;
				}
				$i++;
			}
			echo '<textarea rows="4" id="result" cols="33" onclick="SelectAll(\'result\')" >';
			foreach($split_nmbr as $nmbr){
				if (($nmbr+$key)>52){
					if (dec_to_char($nmbr)!=null){
						echo dec_to_char(($nmbr+$key)-52);
					} else {
						echo $nmbr;
					}
				} else {
					if (dec_to_char($nmbr)!=null){
						echo dec_to_char($nmbr+$key);
					} else {
						echo $nmbr;
					}
				}
			}
			echo '</textarea><br/>';
		} else if ((isset($_POST['key_caesar'])) && (isset($_POST['plantext_caesar'])) && isset($_POST['decrypt_caesar'])){
			$key=$_POST['key_caesar'];
			$plantext=$_POST['plantext_caesar'];
			$i=0;
			$split_chr=str_split($plantext);
			while ($key>52){
				$key=$key-52;
			}
			foreach($split_chr as $chr){
				if (char_to_dec($chr)!=null){
					$split_nmbr[$i]=char_to_dec($chr);
				} else {
					$split_nmbr[$i]=$chr;
				}
				$i++;
			}
			echo '<textarea rows="4" id="result" cols="33" onclick="SelectAll(\'result\')" >';
			foreach($split_nmbr as $nmbr){
				if (($nmbr-$key)<1){
					if (dec_to_char($nmbr)!=null){
						echo dec_to_char(($nmbr-$key)+52);
					} else {
						echo $nmbr;
					}
				} else {
					if (dec_to_char($nmbr)!=null){
						echo dec_to_char($nmbr-$key);
					} else {
						echo $nmbr;
					}
				}
			}
			echo '</textarea><br/>';
			
	//----------------------------------------------------------------//
	// vigenere														  //
	//----------------------------------------------------------------//
		} else if ((isset($_POST['key_vigenere'])) && (isset($_POST['plantext_vigenere'])) && (isset($_POST['encrypt_vigenere']))){
			$key=$_POST['key_vigenere'];
			$plantext=$_POST['plantext_vigenere'];
			$len_key=strlen($key);
			$len_plantext=strlen($plantext);
			$split_key=str_split($key);
			$split_plantext=str_split($plantext);
			
			echo '<textarea rows="4" id="result" cols="33" onclick="SelectAll(\'result\')" >';
			$i=0;
			for($j=0;$j<$len_plantext;$j++){
				if ($i==$len_key){
					$i=0;
				}
				$split_key2[$j]=$split_key[$i];
				$i++;
			}
			for($k=0;$k<$len_plantext;$k++){
				$a=char_to_dec($split_key2[$k]);
				$b=char_to_dec($split_plantext[$k]);
				if (($a && $b)!=null){
					echo (tabel_vigenere_encrypt($a, $b));
				} else {
					echo $split_plantext[$k];
				}
			}
			echo '</textarea><br/>';
		} else if ((isset($_POST['key_vigenere'])) && (isset($_POST['plantext_vigenere'])) && (isset($_POST['decrypt_vigenere']))){
			$key=$_POST['key_vigenere'];
			$plantext=$_POST['plantext_vigenere'];
			$len_key=strlen($key);
			$len_plantext=strlen($plantext);
			$split_key=str_split($key);
			$split_plantext=str_split($plantext);
			
			echo '<textarea rows="4" id="result" cols="33" onclick="SelectAll(\'result\')" >';
			$i=0;
			for($j=0;$j<$len_plantext;$j++){
				if ($i==$len_key){
					$i=0;
				}
				$split_key2[$j]=$split_key[$i];
				$i++;
			}
			
			for($k=0;$k<$len_plantext;$k++){
				$a=char_to_dec($split_key2[$k]);
				$b=char_to_dec($split_plantext[$k]);
				if (($a && $b)!=null){
					echo (tabel_vigenere_decrypt($b, $a));
				} else {
					echo $split_plantext[$k];
				}
			}
			
			echo '</textarea><br/>';

		} else {
			echo "result here...";
		}
	?>
	</fieldset>
	</td></tr>
	<tr><td valign="top">
	<fieldset>
	<legend><b>Vigenere</b></legend>
	<form action="" method="post">
	<input type="text" name="key_vigenere" id="key_vigenere" value="the key..." onclick="SelectAll('key_vigenere')" />
	<input type="submit" value="?" onclick="InfoVigenere()" /><br/>
	<textarea rows="4" name="plantext_vigenere" id="plantext_vigenere" cols="33" onclick="SelectAll('plantext_vigenere')" >plan text...</textarea><br/>
	<input type="submit" name="encrypt_vigenere" value="Encrypt" /><input type="submit" name="decrypt_vigenere" value="Decrypt" /><input type="reset" value="Reset" />
	</form>
	</fieldset>
	</td></tr>
	<!-- masih dalam pengerjaan :p
	<tr><td valign="top">
	<fieldset>
	<legend><b>Playfair</b></legend>
	<form action="" method="post">
	<input type="text" name="key_playfair" id="key_playfair" value="the key..." onclick="SelectAll('key_playfair')" /><br/>
	<textarea rows="4" name="plantext_playfair" id="plantext_playfair" cols="33" onclick="SelectAll('plantext_playfair')" >plan text...</textarea><br/>
	<input type="submit" name="encrypt_playfair" value="Encrypt" /><input type="submit" name="Decrypt_playfair" value="Decrypt" /><input type="reset" value="Reset" />
	</form>
	</fieldset>
	</td></tr>
	-->
	</table>
</body>
</html>

kemudian untuk hasil jadinya bisa di lihat di http://zaf.web.id/labs/cipher

Terkait

23 Comments

Riri berliani


April 28, 2016, 3:37 am

Maaf pak mau nanya,,
Misalnya :
Plaintextnya : saya ingin bertanya
Kata kuncinya: 12345
Kira2 bisa gak di enkripsi dan dekripsi?

Terima kasih
- Zaf
  
  
  April 28, 2016, 6:25 am
  
  Bisa mbak, coba dijalankan saja script nya atau dicoba langsung disini http://zaf.web.id/labs/cipher/
  - Riri berliani
    
    
    September 14, 2016, 2:28 pm
    
    Maaf ngerepotin pak, bisa konsul soal program kriptografi gak??
    Lagi pusing mikirin alur programnya.
    - Zaf
      
      
      September 15, 2016, 4:21 pm
      
      Kriptografi yang bagaimana mbak?
      - Riri berliani
        
        November 3, 2016, 3:11 am
        
        Vigenere ciphernya gak bisa angka pak???
belajar


Desember 16, 2016, 9:09 am

permisi numoang nanya untuk semua Encrypt dan decrypt masih belom bisa dengan spasi ya?
WhySosSerious


Maret 6, 2017, 10:40 am

bang mau nanya, itu yg di file index.php nilai 52 itu dari mana ya ???
Donna


Maret 27, 2017, 7:58 am

Maaf nanya mas, kalo mau desain pake css bisa? Terus desainnya dibagian mana? Makasih
informasi


April 11, 2017, 9:28 am

untuk veginere bisa gk enkrip hasilnya keluar ascii?
ezra


Mei 14, 2017, 8:19 pm

selamat malam min, mau tanya, algoritmanya enkripsi dan deskripsinya rumusnya apa ya?
Heri Wijana


Juli 20, 2017, 11:39 am

terimakasih.. izin copas gan
cahibbjik


September 28, 2017, 12:38 pm

terimakasih sangat membantu..post terus ya..izin copy paste
Roy Mandala


Maret 6, 2018, 7:24 pm

Halo kak numpang tanya dong, khususnya untuk kriptografi VIGENERE, saya ingin mengimplementasikannya pada database toko online mohon bantuannya kak
Roy Mandala


Maret 6, 2018, 7:25 pm

Maksud saya tahapan awalnya seperti apa ya kak
Pingback: tutorial program caesar chiper menggunakan PHP | Online Coding
cilkhweb


September 17, 2018, 12:24 pm

bg kalo penggabungan caesar dengan transposisi gimana bg?
satya


Oktober 28, 2018, 5:39 pm

bang mau tanya dong knp ya kl inputan spasi tidak terdeksi ?
Chintia


November 14, 2020, 11:53 pm

Kak tidak ada jurnal nya kak?
- Zaf
  
  
  November 15, 2020, 8:02 am
  
  Tidak ada
Anis


November 17, 2020, 2:38 am

kelanjutan yang affair mana kak ? hehe
Clara


Oktober 8, 2022, 10:13 pm

bagn coding result kok rusak
Rimba wahyu soga


Oktober 13, 2022, 1:57 pm

maaf ka mau nanya. ini Menggunakan bahasa pemrograman apa ka???
- Zaf
  
  
  November 3, 2022, 12:05 am
  
  ini menggunakan bahasa PHP

Implementasi cipher dengan PHP

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