Zip & Encryption in PHP

I recall a discussion that touched on encrypted Zip file support some months back. I can't remember who it was who asked about it, but I've found a decent solution. Info-Zip has a zcrypt "plugin" for the zip/unzip commands. Download the zcrypt, unzip and zip source packages from http://www.mirrorservice.org/sites/ftp.info-zip.org/pub/infozip/src/. Copy the crypt.h and crypt.c files from zcrypt into the zip and unzip source trees and when you build those two utilities they will have encrypted zip file support. ('make -f unix/Makefile generic' should work) The -e option is added to the zip command to encrypt the contents. It seems to require an interactive terminal to enter the password. I was only interested in unzip, which takes the password via the command line. ('unzip -P password file.zip') I tested it with the ZIP+4 data from the USPS and it decrypted the data fine. I'm not sure if this code can be used with the existing PHP Zip extension or not, but at the least, the command line tools seem to work just fine. - Gabriel =====