On 5/29/06, Ricardo Frydman Eureka! <[EMAIL PROTECTED]> wrote:
A riesgo de pecar de ingenuo e ignorante (puedo jactarme de haber usado
Ignorante, no. Ingenuo, si. Estuve buscando y encontre este comentario que creo que responde tus dudas: "Word does not use RC4 with a 128-bit key; it uses RC4 with a 40-bit key which is derived from a 128-bit hash (MD5, if I remember correctly) of the user-provided password. (Since version 97, that is. Earlier versions of Word used a "toy" cipher - a trivial Vigenere variant.) Given the speed of computers nowadays, and given that RC4 is a relatively fast cipher, a 40-bit-long key for it is ridiculously insecure anyway - no matter how implemented. Even if the flaw you're discussing here didn't exist, one could still brute-force the cipher in a few days on a reasonably fast PC (much faster if a cluster of PCs is used). There are even cracking programs for Word documents floating around that do just that. They don't recover the password; they just exhaust the full (relatively small) 40-bit keyspace and decrypt the document." -- Bioinformatics news: http://www.bioinformatica.info Lriser: http://www.linspire.com/lraiser_success.php?serial=318 -- Para desuscribirte tenés que visitar la página https://listas.linux.org.ar/mailman/listinfo/lugar-gral/ /* Publica y encontra trabajo relacionado con softlibre en http://www.usla.org.ar/modules/jobs/ */ Si tenés algún inconveniente o consulta escribí a mailto:[EMAIL PROTECTED]
