encrypted zip files!

[zadon]

Does anyone know how to open encrypted zip files (without knowing the password, of course...)????

 

[Geoff]

If by opening it, i assume you mean opening a file that you created and simply lost the password to

heres a program that i would try: http://www.download.com/Ultimate-ZIP-Cracker/3000-2092_4-8345870.html?tag=lst-0-1

 

[Jon Boy]

Bear in mind you could literaly be waiting days untill it recovers a password, depending on its length.

 

[Geoff]

Bear in mind you could literaly be waiting days untill it recovers a password, depending on its length.

true, and the trial only allows you to see the first few digits/letters.

 

[Jon Boy]

Yeah I tried a similar programme spent 1 hour and it had only got half way through 3 letter/number/punctuation combination. Then every digit added to the search like multiplies it to the power of like 50 times in length.

 

[ceewi1]

There are two main ways to crack a file (most programs will try both)

1. Dictionary Attack: The program tries words out of a dictionary, and variations on those words (e.g. replacing the letter O with the number 0). This is generally relatively quick to perform

2. Brute force: The program tries all combinations of letters and numbers until it finds the correct one. For passwords longer than about 6 characters this will be unviable on ordinary computers, as it will take days, weeks, months or years.

There are many programs such as the one posted, but all do similar things (albeit with slightly different dictionaries). In short, if it's a long password and can't be found with a dictionary attack, it's probably a lost cause.

This is why security saavy sites require users to use passwords at least 6-8 characters long, with a combination of numbers and letters.

 

[computerhakk]

yups. most encrypted zip/rar these days are long site names like

http://cnefes.net/try_to_help_and_donate

have you tried googling for it?