Date: Thu, 18 Aug 2011 11:35:19 -0500 From: "jfoug" <jfoug@....net> To: <john-dev@...ts.openwall.com> Subject: Request for encrypted zip files. I would like to request people to send me some encrypted zip file examples, using the 'old' PKWARE encryption method. I need people to zip up 3 or 4 small files, use the same password for all. Also, zip the same files without the password, using the same encryption package. Then, provide me with the 2 zip's, the password used, what OS, what zip program (and version). I do not need pkware zip 2.08g or 2.50. Mostly, I am looking for these zippers: InfoZip, MAC (older versions) ZipIt mac, first version, and v.1.3.5 and newer Different Info-Zip versions. Different versions (especially older) of winzip, or freezip. I need this, to try to find out which packages use 1 and which packages use 2 byte checksums within the encryption checksum code. The 2 byte checksums allow john to have to decrypt/decompress a lot less frequently. Testing the checksums is much faster, and the more passwords that can be eliminated with just a checksum check, the faster john will process. Now, the 'safe' way to proceed, is to always decrypt/decompress check if a single byte checksum it happens, but if we know that a specific package can be detected, and it produces 2 byte checksums, then we would want to proceed using both bytes. At this time, it appears InfoZip does this (2 byte). I have some checks in to detect infozip, but I do not know if all versions on all OS's behave the same way. Thus the request for samples. My email is jfoug at cox^net Replace the ^ with a . and the at with @ DO NOT send anything sensitive in nature. A simple set of dummy text files with junk data is just fine, along with a small binary file. I am posting to john-dev at this time. I may make the same post on john-users if there are not enough results from this query. Jim. Content of type "text/html" skipped
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