Hello,

I've a zip file that contains a software protected by a password from the seller. The seller delivered the file to me, and he didn't include the password in his email. I tried many times to contact him but he never replied!

this happened 5 months ago, and from that time, I kept trying to contact him and to get the password using zip kep (brute force) but neither ways succeeded

I no nothing about the password, I don't know how many characters does it containt, nethier the type of the characters. This is why I should have try all the characters, and maybe upto 30 characters, i don't know!

I wonder now if getting about 10 computers will help me to increase the ability of getting the password quickly via zip kep, does that help? How? Because with trying to find the password through brute force for all the combinations upto just 15 characters, will need milliions of years!!!!

just googled and found this service:
http://www.passwordbusters.com/profile_zip.htm

I've tried with them, but they could not get it!

Visual ZIP Password v5.54

Zip Password Finder

Peace,

Do you, by any chance, have any of the files in the zip? This only works when you know at least some of the contents in the encrypted zip file.

You want to use a known-plaintext attack to get the password, using a program called PKCrack.

For example, if you have an encrypted zip file that you know contains a file called readme.txt, and you happen to have the unencrypted version of the same file. This attack will work.

It should be able to crack the password within a few minutes!

Here are some tutorials:
http://www.securiteam.com/tools/5NP0C009PU.html
http://www.woodmann.com/crackz/Tutorials/Zipcrkct.htm

PKCrack:
http://www.unix-ag.uni-kl.de/~conrad/krypto/pkcrack.html