Suite a un exo de math de seconde pour ma fille et inspiré de source
http://www.vbfrance.com/codes/CHIFFRAGE-DECHIFFRAGE-FONCTION-AFFINE_51052.aspx
petit programme java permettant de chiffrer, dechiffrer par la methode affine avec et sans parametres A et B, et de faire une analyse frequentielle du texte a dechiffrer.
Source / Exemple :
/*
package affinegui;
import org.jdesktop.application.ResourceMap;
import org.jdesktop.application.SingleFrameApplication;
import org.jdesktop.application.FrameView;
import javax.swing.Icon;
import javax.swing.JDialog;
import java.text.DecimalFormat;
public class AffineguiView extends FrameView {
public AffineguiView(SingleFrameApplication app) {
super(app);
initComponents();
ResourceMap resourceMap = getResourceMap();
}
//Codage avec les parametres A et B
public static String encode(String str2crypt, int a, int b)
{
str2crypt=str2crypt.replace(" ","");
String alphab="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
String affstr="";
try
{
for(int i=0;i<str2crypt.length();i++)
{
if((i+1)%4!=0)
affstr=affstr+alphab.substring((((alphab.indexOf(str2crypt.toUpperCase().charAt(i))*a)+b)%26),(((alphab.indexOf(str2crypt.toUpperCase().charAt(i))*a)+b)%26)+1);
else
affstr=affstr+alphab.substring((((alphab.indexOf(str2crypt.toUpperCase().charAt(i))*a)+b)%26),(((alphab.indexOf(str2crypt.toUpperCase().charAt(i))*a)+b)%26)+1)+" ";
}
}
catch (Exception e)
{
throw new Error("Error.");
}
return affstr;
}
//Decodage avec les parametres A et B
public static String decode(String str2decrypt, int a, int b)
{
String affstr1="";
String alphab="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
str2decrypt=str2decrypt.replace(" ","");
int invA=0;
for(int j=1;j<27;j++)
{
if((a*j)%26==1)
{
invA=j;
break;
}
}
try
{
for(int m=0;m<str2decrypt.length();m++)
{
if(((alphab.indexOf(str2decrypt.charAt(m))-b)*invA)>=0)
{
affstr1=affstr1+alphab.substring(((invA*((alphab.indexOf(str2decrypt.charAt(m)))-b))%26),((invA*((alphab.indexOf(str2decrypt.charAt(m)))-b))%26)+1);
}
else
{
affstr1=affstr1+alphab.substring(((invA*((alphab.indexOf(str2decrypt.charAt(m)))-b))%26)+26,((invA*((alphab.indexOf(str2decrypt.charAt(m)))-b))%26)+27);
}
}
}
catch(Exception e1)
{
e1.printStackTrace();
}
return affstr1;
}
//Decodage des 312 cas possibles
public static String decodebulk(String str2decrypt2)
{
String affstr2="";
int a[]={(1),(3),(5),(7),(9),(11),(15),(17),(19),(21),(23),(25)};
int count=1;
for(int k=0;k<26;k++)
{
for(int l=0;l<12;l++)
{
affstr2=affstr2+"count="+count+"\r\na= "+a[l]+" b= "+k+"\r\n";
affstr2=affstr2+"String Decrypted ...... " + decode(str2decrypt2,a[l],k)+"\r\n\r\n";
count+=1;
}
}
return affstr2;
}
//Analyse Frequentielle du texte
public String anfreq(String str)
{
String result="\r\nAnalyse Frequentielle\r\n";
result=result+"----------\r\n";
String alphab="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
int[] count = new int[26];
DecimalFormat df = new DecimalFormat("0.00");
int totcount=0;
double total=0;
try
{
for(int i=0;i<str.length();i++)
{
for(int j=0;j<26;j++)
{
if(j==alphab.indexOf(str.toUpperCase().charAt(i)))
{
count[j]+=1;
}
}
}
for(int l=0;l<26;l++)
{
totcount=totcount+count[l];
}
for(int k=0;k<26;k++)
{
if(count[k]!=0)
{
result=result+alphab.substring(k,k+1)+":"+count[k]+":"+df.format((double)count[k]/(totcount))+"\r\n";
total=total+((double)count[k]/(totcount));
}
}
result=result+"----------\r\n";
result=result+"Total: "+df.format(total)+"\r\n";
result=result+"----------\r\n";
result=result+"----------\r\n";
result=result+"Total Lettres: "+totcount+"\r\n";
result=result+"----------\r\n";
}
catch(Exception e)
{
e.printStackTrace();
}
return result;
}
private void initComponents() {
mainPanel = new javax.swing.JPanel();
jComboBox1 = new javax.swing.JComboBox();
jComboBox2 = new javax.swing.JComboBox();
jTextArea1 = new javax.swing.JTextArea();
jTextArea2 = new javax.swing.JTextArea();
jTextArea3 = new javax.swing.JTextArea();
jTextArea4 = new javax.swing.JTextArea();
jScrollPane1 = new javax.swing.JScrollPane();
jScrollPane2 = new javax.swing.JScrollPane();
jScrollPane3 = new javax.swing.JScrollPane();
jScrollPane4 = new javax.swing.JScrollPane();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
jButton3 = new javax.swing.JButton();
jButton4 = new javax.swing.JButton();
org.jdesktop.application.ResourceMap resourceMap = org.jdesktop.application.Application.getInstance(affinegui.AffineguiApp.class).getContext().getResourceMap(AffineguiView.class);
mainPanel.setBackground(resourceMap.getColor("mainPanel.background"));
mainPanel.setBorder(new javax.swing.border.SoftBevelBorder(javax.swing.border.BevelBorder.RAISED));
mainPanel.setToolTipText(resourceMap.getString("mainPanel.toolTipText"));
mainPanel.setName("mainPanel");
jComboBox1.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "1", "3", "5", "7", "9", "11", "15", "17", "19", "21", "23", "25" }));
jComboBox1.setName("jComboBox1");
jComboBox2.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24", "25" }));
jComboBox2.setName("jComboBox2");
jScrollPane2.setName("jScrollPane2");
jTextArea2.setColumns(20);
jTextArea2.setLineWrap(true);
jTextArea2.setRows(5);
jTextArea2.setText(resourceMap.getString("jTextArea2.text"));
jTextArea2.setName("jTextArea2");
jScrollPane2.setViewportView(jTextArea2);
jScrollPane1.setName("jScrollPane1");
jTextArea1.setColumns(20);
jTextArea1.setLineWrap(true);
jTextArea1.setRows(5);
jTextArea1.setText(resourceMap.getString("jTextArea1.text"));
jTextArea1.setName("jTextArea1");
jScrollPane1.setViewportView(jTextArea1);
jLabel1.setText(resourceMap.getString("jLabel1.text"));
jLabel1.setName("jLabel1");
jLabel2.setText(resourceMap.getString("jLabel2.text"));
jLabel2.setName("jLabel2");
jScrollPane3.setName("jScrollPane3");
jTextArea3.setColumns(20);
jTextArea3.setLineWrap(true);
jTextArea3.setRows(5);
jTextArea3.setName("jTextArea3");
jScrollPane3.setViewportView(jTextArea3);
jButton1.setText(resourceMap.getString("jButton1.text"));
jButton1.setName("jButton1");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton2.setText(resourceMap.getString("jButton2.text"));
jButton2.setName("jButton2");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
jButton3.setText(resourceMap.getString("jButton3.text"));
jButton3.setName("jButton3");
jButton3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton3ActionPerformed(evt);
}
});
jScrollPane4.setName("jScrollPane4");
jTextArea4.setColumns(20);
jTextArea4.setRows(5);
jTextArea4.setName("jTextArea4");
jScrollPane4.setViewportView(jTextArea4);
jButton4.setText(resourceMap.getString("jButton4.text"));
jButton4.setName("jButton4");
jButton4.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton4ActionPerformed(evt);
}
});
javax.swing.GroupLayout mainPanelLayout = new javax.swing.GroupLayout(mainPanel);
mainPanel.setLayout(mainPanelLayout);
mainPanelLayout.setHorizontalGroup(
mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(mainPanelLayout.createSequentialGroup()
.addGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(mainPanelLayout.createSequentialGroup()
.addGap(108, 108, 108)
.addComponent(jLabel1)
.addGap(18, 18, 18)
.addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(25, 25, 25)
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jComboBox2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(mainPanelLayout.createSequentialGroup()
.addContainerGap()
.addGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(jScrollPane2, javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane1, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 379, Short.MAX_VALUE)
.addComponent(jScrollPane3, javax.swing.GroupLayout.Alignment.LEADING))
.addGap(18, 18, 18)
.addGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(mainPanelLayout.createSequentialGroup()
.addGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jButton3)
.addComponent(jButton2)
.addComponent(jButton1))
.addGap(44, 44, 44)
.addComponent(jScrollPane4, javax.swing.GroupLayout.DEFAULT_SIZE, 215, Short.MAX_VALUE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, mainPanelLayout.createSequentialGroup()
.addComponent(jButton4)
.addGap(38, 38, 38)))))
.addContainerGap())
);
mainPanelLayout.setVerticalGroup(
mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(mainPanelLayout.createSequentialGroup()
.addGap(22, 22, 22)
.addGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel1)
.addComponent(jComboBox2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel2))
.addGap(18, 18, 18)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jScrollPane3, javax.swing.GroupLayout.DEFAULT_SIZE, 169, Short.MAX_VALUE)
.addContainerGap())
.addGroup(mainPanelLayout.createSequentialGroup()
.addGap(46, 46, 46)
.addComponent(jButton4)
.addGap(18, 18, 18)
.addGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(mainPanelLayout.createSequentialGroup()
.addComponent(jScrollPane4, javax.swing.GroupLayout.DEFAULT_SIZE, 351, Short.MAX_VALUE)
.addContainerGap())
.addGroup(mainPanelLayout.createSequentialGroup()
.addComponent(jButton1)
.addGap(91, 91, 91)
.addComponent(jButton2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 109, Short.MAX_VALUE)
.addComponent(jButton3)
.addGap(93, 93, 93))))
);
setComponent(mainPanel);
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
jTextArea2.setText("");
jTextArea2.setText(encode(jTextArea1.getText(),Integer.parseInt(jComboBox1.getSelectedItem().toString()),Integer.parseInt(jComboBox2.getSelectedItem().toString())));
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
jTextArea1.setText("");
jTextArea1.setText(decode(jTextArea2.getText(),Integer.parseInt(jComboBox1.getSelectedItem().toString()),Integer.parseInt(jComboBox2.getSelectedItem().toString())));
}
private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {
jTextArea3.setText("");
jTextArea3.setText(decodebulk(jTextArea2.getText()));
}
private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {
jTextArea4.setText(anfreq(jTextArea2.getText()));
}
// Variables declaration
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JButton jButton3;
private javax.swing.JButton jButton4;
private javax.swing.JComboBox jComboBox1;
private javax.swing.JComboBox jComboBox2;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JScrollPane jScrollPane3;
private javax.swing.JScrollPane jScrollPane4;
private javax.swing.JTextArea jTextArea1;
private javax.swing.JTextArea jTextArea2;
private javax.swing.JTextArea jTextArea3;
private javax.swing.JTextArea jTextArea4;
private javax.swing.JPanel mainPanel;
private javax.swing.JMenuBar menuBar;
// End of variables declaration
}
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