  
 
Introduction
  
y
        
  
x

x111 =ymod 501
    
          
111

501
  
     
              
            
            
          
   
      
       
         
Table des matières
1 Primitives symétriques 4
                                    
                                       
                                      
                                       
                                      
2 Primitives asymétriques 9
                                  
                                     
                                            
3 Arithmétique des entiers 12
                                     
                                            
                                       
                                        
                                     
                                             
                                          
                                           
4 Décompositions et applications 21
                                        
                                      
                                      
5 Arithmétique modulaire 25
                                        
                                           
                                       
                                        
                                       
                                        
                                       
6 Groupes en cryptographie 33
                                        
                                        
                                         
                                          
                                        
                                    
Bibliographie 40
Chapitre 1
Primitives symétriques
           
            
           
       
         
           
              
        
intégrité :      
authenticité :        
condentialité :        
1.1 Contexte et terminologie
            
         
={A, . . . , Z}
  
             
Exemple.      
           
                
           
Dénition.

M=()
    
méthode de chirement

 (E,D)   M   DE=idM    
  
Eid D
mM E (m)E(m)D(E(m)) = m
   
            
E(m)
   
   
sûre
           
m       symétrique   E     D
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