I don't suppose 7zip can read those encryped files can it? It says it has support for AES.
Not that that really helps I suppose but it sucks a lot less than WinZip does On Fri, Jul 1, 2011 at 4:12 PM, Greg Keogh <[email protected]> wrote: > Just to finish-up from yesterday. My experiments show that SharpZipLib and > DotNetZip produce compatible zip files that can be processed by PKZIP and > WinZip, so long as you’re not using strong encryption (that result is > expected of course, otherwise someone’s deflate code is wonky and that would > have been discovered by now).**** > > ** ** > > As we seem to agree, the DotNetZip library is friendlier for developers to > consume and it seems to have more features. Only SharpZipLib has Silverlight > support at the moment, but the DotnetZip home page says it’s coming in the > next release. I’m sticking to DotNetZip from now on.**** > > ** ** > > Now once you get into strong encryption things get messy for .NET > developers. I have proof that PKZIP and WinZip files are not compatible if > you use strong encryption. Some historical articles I found lament this back > in 2003 when WinZip diverged with an arguably non-standard format. Since > then they compromised a bit and their products have unzip support for each > other. It seems that the WinZip format is ahead in the popularity polls > because of its open documentation.**** > > ** ** > > PKZIP can encrypt files with a variety of strong algorithms (including > AES), and it looks like no one but PKZIP can read them back again. This > applies to my backups in the cloud, which is a worry!**** > > ** ** > > So if you want to manipulate strongly encrypted zip files in managed code > then it looks like WinZip and the DotNetZip library (with AES only) are the > only useful combinations I can find. All of my future backups will be in > this format and I might even delete PKZIP.**** > > ** ** > > Greg**** > > ** ** > > P.S. I downloaded WinZip 15 eval copy on a spare VM so I could sanity check > my files. Holey schmoley! What a load of bloated crapware WinZip has become > since I last saw it many years ago. It looks like it was created by a > dyslexic colour-blind school kid with too much hobby time.**** >
