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Políticas de seguridad
     Claves Asimetricas

     Sena Regional Valle del Cauca
      Centro Agropecuario de Buga
    Programa de comercio y servicios
    Teleinformática Proyecto Gnu­Glp
         Administración de redes 
       José William Viáfara García
                  Viafarajw                                 1
                                       José William Viáfara García
Claves asimétricas
        En 1976 los matemáticos Whit Diffie y Martin Hellman 
            crearon los sistemas criptográficos de clave 
                        asimétrica o pública.

viafarajw                          
La criptografía asimétrica

            utiliza dos claves:

            la clave privada 

            y la clave pública.


viafarajw                           
La clave privada
                                           de Ana sólo 
      La criptografía asimétrica
                                         la debe conocer
                                               Ana
            utiliza dos claves:

            la clave privada 
                                          La clave pública
            y la clave pública.          de Ana la puede 
                                        conocer cualquiera
                                       ya que está en bases 
viafarajw                           
                                         de datos públicas
Lo que esté encriptado con la clave privada de ANA 




  necesita la clave pública de ANA para desencriptarse




viafarajw                             
Si Ana envía a Benito un mensaje 
             encriptado con su clave privada 




                       Benito necesitará  la clave pública 
                          de Ana para desencriptarlo



               Y así Benito estará seguro de que ha sido Ana 
                  y no otra persona la que envió el mensaje
viafarajw                               
Y, al revés, lo que esté encriptado con 
        la clave pública de ANA




   necesita la clave privada de ANA 
   para desencriptarse




    viafarajw                               
Si Benito quiere enviar un mensaje a Ana
            lo encriptará con la clave pública de Ana



                                 Ana necesitará usar su clave privada 
                                para desencriptar el mensaje de Benito




                     Sólo Ana puede entender los mensajes
                        encriptados con su clave pública
viafarajw                                 
Las ventajas de las claves asimétricas se 
            perciben plenamente cuando se combinan 
                   las claves de dos personas.



             Supongamos que ANA quiere enviar un 
                     mensaje a BENITO



viafarajw                        
Ana encripta el mensaje con su 
                        clave privada 




                  y con la clave pública de 
                            Benito
viafarajw    
Benito desencripta el 
                    mensaje con su clave 
                          privada 




                y con la clave pública 
                       de Ana
viafarajw    
Ana está segura de que sólo Benito        Benito está seguro de que ha sido 
    ha podido leer el mensaje                 Ana la que lo ha enviado


  viafarajw                            

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