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     CRYPTOSEC     Sécurité des systèmes d'information, infrastructures de confiance
Accueil du site > Quelques utilisations des clés et certificats

Authentification

MAC et HMAC

jeudi 28 mars 2002

MAC (Message Authentification Code) :
Une méthode consiste à utiliser un algorithme de chiffrement par blocs en mode chaîné.
On peut par exemple chiffrer les données à l’aide d’un DES en mode CBC, puis considérer le dernier bloc comme étant le MAC.
Le destinataire ne pourra vérifier l’intégrité des données que s’il possède la clé symétrique ayant servi à la génération du MAC.
Contrairement à la signature électronique, seul un destinataire particulier sera en mesure de faire cette opération.
L’utilisation de MAC (monde bancaire par exemple) n’assure pas vraiment la non-répudiation : les destinataires possèdent en effet la même clé symétrique que l’expéditeur. Ce dernier peut donc légitimement nier avoir signé telles données en générant un MAC, arguant du fait qu’il n’est pas le seul à pouvoir le faire.
Il faut de plus s’assurer d’un canal sûr pour transmettre la clé symétrique.

HMAC (Hashed Message Authentification Code) :
On peut aussi joindre aux données à signer une chaîne aléatoire de bits, puis passer le tout au travers d’une fonction de hachage pour obtenir le HMAC, ou « keyed-MAC ». Le destinataire recalcule un HMAC à l’aide du code qu’il partage avec l’expéditeur. Si les deux MACs sont égaux, il est assuré de l’intégrité des données et de l’authenticité de la signature (encore faut-il que chaque code soit associé de façon non équivoque à deux identités).
L’utilisation de HMAC n’assure pas non plus la non-répudiation, et l’échange sécurisé des codes est aussi à gérer.
Les détails sont plus subtils. Voir les bouquins et la RFC 2104.


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/var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 323 Deprecated: Function ereg() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 1419 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 377 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 378 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 379 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 334 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 277 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 278 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 281 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 305 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 323 Deprecated: Function ereg() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 1419 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 377 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 378 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 379 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 334 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 277 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 278 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 281 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 305 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 312 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 323 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 377 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 378 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 379 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 334 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 277 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 278 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 281 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 305 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 323 Deprecated: Function ereg() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 1419 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 377 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 378 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 379 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 334 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 277 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 278 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 281 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 305 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 312 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 323 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 377 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 378 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 379 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 334 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 277 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 278 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 281 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 305 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 323 Deprecated: Function ereg() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 1419 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 377 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 378 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 379 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 334 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 277 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 278 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 281 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 305 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 323 Deprecated: Function ereg() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 1419 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 377 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 378 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 379 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 334 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 277 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 278 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 281 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 305 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 323 Deprecated: Function ereg() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 1419 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 377 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 378 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 379 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 334 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 277 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 278 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 281 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 305 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 323 Deprecated: Function ereg() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 1419 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 377 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 378 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 379 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 334 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 277 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 278 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 281 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 305 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 323 Deprecated: Function ereg() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/texte.php on line 1419 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 377 Deprecated: Function eregi_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 378 Deprecated: Function ereg_replace() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/filtres.php on line 379 Deprecated: Function ereg() is deprecated in /var/alternc/html/c/cryptosec/ecrire/inc/flock.php on line 60
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