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I'm working on something that requires me to zip up a file, and change it to a .pack file. I'm thinking about attempting to zip it up with a password so that no one can un-zip it without my permission, but the problem is, I'm not sure how safe it is to zip something up with a password.

How hard, or what knowledge would someone need to know to access my zipped files?

Basically, I just don't want someone to run a program and be able to unrar my files..

atom0s · Posted: Sat Jan 01, 2011 2:27 am Post subject:

Brute forcing, rainbow tables, and a little patience will crack your password.

mystique · Guest

Are you talking about RAR or ZIP when you say "zip it up"? Razz

The 7z format has very strong encryption system. It uses AES-256 cipher and SHA-256 hash for the key generation. The hash is executed 2^19 times, making all brute force attacks and rainbow tables useless. No one will crack your files if the password is not something like "1234".

I don't know that much about RAR encryption but I think rar v. 2 and v. 3 use similar hashing techniques and v. 3 also uses AES so it should be more than enough safe.

Modern versions of ZIP support AES but the old encryption (ZipCrypto) is not very safe. It's vulnerable to known-plaintext attack and if the archive is created using certain versions of WinZip, the encryption key can be found easily using just brute force.