Date: Thu, 9 Mar 2006 13:29:30 +0100 From: Turko <granturko@...il.com> To: john-users@...ts.openwall.com Subject: Re: checking only first 5 characters of a md5 hash Maybe I didn't explained in a good way (sorry for my english) : the first 5 chars are not of the password, but they are the first 5 of the md5 HASH. So I know 5 first characters of the HASH for example "abc123xxxxxxxxxxx" ) , using John can I find all the passwords that have their encryption starting with "abc123" ? Is this way faster then crack the entire HASH right? (abc123 can correspond to first part of many different hashes -> many possible passwords -> the first I find is good) . Is correct the idea? Becouse I don't know how the md5 algorithm works exactly.... .Thanks. On 3/9/06, rembrandt@...erlin.de <rembrandt@...erlin.de> wrote: > > > How can I tell John to get the substring of the hash and checking only > its > > 5 > > chars? > > > > .Thanks. > > As far as I know you can`t because for this john would have to know the > keyspace to know where to start and where to end. > > Maybe I`m wrong but such a function is not implemented (as far as I know) > but reducing the keyspace by using parts of the key you know or even the > start of the plaintext-password is maybe a neat function... :-) > > E.g. if you just saw that xyz entered "At526" at the beginning of the > passwords. Not that we spy passwords.. it`s more to speed up cracking > passwords of users who left. :-)) > > Kind regards, > Rembrandt > > > -- > To unsubscribe, e-mail john-users-unsubscribe@...ts.openwall.com and reply > to the automated confirmation request that will be sent to you. > > -- L'imbecille cade sulla schiena e si sbuccia il naso. (Proverbio Yiddish). Non esistono donne brutte. Dipende solo da quanta vodka bevi (Proverbio russo).
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