I need Help with a ZIP encrypted

Quote from HaDeS

The server was formated a few weeks ago, and the data is irrecoverable

Thank you very much Z and Kender for the reply. With that analysis I'm sure that the file is encrypted with AES 256.

Well, you only have a few options left.
1. talk to anyone who used that server and ask them if they ever encrypted zip files, and if yes with which password.
2. find a password cracker for winzip AES 256 encrypted files, run a wordlist and a bruteforce. If the pass is less than 12 characters you should be able to crack it within a year or so.

Quote from Kender

2. find a password cracker for winzip AES 256 encrypted files, run a wordlist and a bruteforce. If the pass is less than 12 characters you should be able to crack it within a year or so.

This one was good.You made him not to loose his confidence.xD

I already try the option of bruteforce and dictionary attack, like I described in the first post

Quote from HaDeS

After all that, I started a brute-force attack and a dictionary one (The dictionary had over 20 million words and some that I always use for passwords)... these two approaches failed though.
That attack was performed with Elcomsoft Advanced Archive Password Recovery.

I will contact the people who mantained the server.
Greets, and thanks again for the reply

Quote from HaDeS

I sent a message to TheHiveMind, and he replied me that "try to check whether there are any 0x0a bytes in the file that are no t directly preceded by a 0x0d byte" to find if I used binary mode or text mode, and I found some 0a 0d bytes and others 0a 0x bytes.
At the moment, I think that isn't a error of transmision.

I have a strong feeling that the file was not corrupted during transmission too. Because most of the time when it's broken Winzip will say that the file is corrupt due to CRC check errors. Probably someone set the password on it.
Also, do you have a copy of any file inside the zip archive? If so, it is possible to recover the password using a famous known plaintext attack ;)

I quangntenemy, I have a lot of archives inside the .ZIP, I checked the file size and the files that I have are equals, but when I use the PKcrack software to do the plain-text attack, it finished saying that the plain text is wrong. I tried too with the Elcomsoft software and it shows me a message that says "Plain-text attack isn't aplicable for this file"
I think is 'cause the plain-text attack is not supported for zip files encrypted with AES.
Anyway thanks for the reply