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- Newsgroups: comp.compression
- Path: sparky!uunet!stanford.edu!nntp.Stanford.EDU!kocherp
- From: kocherp@leland.Stanford.EDU (Paul Carl Kocher)
- Subject: Re: pkzip 2.04c / unzip v5.0 compatibility
- Message-ID: <1993Jan8.224724.23801@leland.Stanford.EDU>
- Keywords: passwords problem.
- Sender: news@leland.Stanford.EDU (Mr News)
- Organization: DSG, Stanford University, CA 94305, USA
- References: <19342@mindlink.bc.ca> <1iierpINNk9f@gap.caltech.edu> <1993Jan8.130724.21237@julian.uwo.ca>
- Date: Fri, 8 Jan 93 22:47:24 GMT
- Lines: 16
-
- In article <1993Jan8.130724.21237@julian.uwo.ca> brianb@julian.uwo.ca (Brian Borowski) writes:
- >If I zip up a file with pkzip 204c with password encryption,
- >I find that unzip 5.0 cannot unzip such a file. It asks for
- >the password, but will not undo the file.
- >
- >Has anyone else observed this behaviour? If I am not doing something
- >right, let me know please.
-
- The encryption algorithm seems to be implemented differently in the
- new pkzip, but the change shouldn't be hard to add to Info-Zip --
- instead of having two bytes of the crc32 at the end of the encryption
- header, the final byte of this header is a zero. (The others are
- pseudorandom.)
-
- -- Paul Kocher
- kocherp@leland.stanford.edu
-