Plateforme Level Extreme
Abonnement
Profil corporatif
Produits & Services
Support
Légal
English
Encrypt user name and email or not?
Message
 
 
À
15/09/2010 09:53:57
Information générale
Forum:
Visual FoxPro
Catégorie:
Autre
Divers
Thread ID:
01481002
Message ID:
01481258
Vues:
35
>I was just pulling your leg - but to answer the question
>
>(1) a hash is always the same length (eg md5 hash = 16 bytes or 32 hex chars)
>(2) encryption without block cyphering (eg rc4) : the lengths will vary
>(3) If you use block ciphering, the lengths will vary depending on the length of the password, but all lengths will be a multiple of the block
>
>So, looking at the lengths of the encrypted passwords
>
>- if the length is constant, it's likely to be a hash
>- if the lengths are a multiple of something (not 1) it's likely to be a block cipher
>- otherwise it's encrypted, but not with a block cipher
>
>I case of passwords - since the lengths are small - it's difficult to distinguish between hash and block cipher
>
>
>see http://en.wikipedia.org/wiki/Block_cipher
>http://en.wikipedia.org/wiki/Cryptographic_hash_function
>
>Post your encrypted passwords and let me guess

Let you guess the password?
If it's not broken, fix it until it is.


My Blog
Précédent
Suivant
Répondre
Fil
Voir

Click here to load this message in the networking platform