encryption didn't work correctly

MDuss

HI.

I have here a little problem.
Actually I have encrypted a small file, 30MB, to an encrypted 7zip Archiv. This works very well.
But now I wanted to encrypt a big file which is 1.3GB large.
I use the same options like before for the small file. But I now get a 1KB file. When I try to open it I get only an error massege that powerarchiver 2017 can not open this file. The file seems not to be an valid Archiv.

But as I said, I use the same Options to create an encrypted file from the big file as I use for the small file.

With powerarchiver 2016 i haven’t this Problems. When I use an big file like the one from above, all works well.

So what can i do to make an valid encrypted Archiv with the big file?
Or I maybe go back to powerarchiver 2016?

Thanks for your help.
Michael Duss

spwolf

@mduss hello, are you using latest PA version? (.92) and what are your OS and your cpu/memory? What are 7z settings?

Also try using PA format instead of 7z, and let us know if that works. Thanks!

MDuss

Hi spwolf

Today I have installed the new Version from PowerArchiver: 17.00.92.
This Version have the same Problem.
I use Windows 7 Ultimate 64-Bit and 32GB RAM with an Intel core i7 5930

When I wanted to encrypt an Archiv I used the following way:
I use the kontextmenue in the file Explorer and use encrypt.

Here I use the following Options:

target Format: 7-zip

compression:
Format: 7-zip
method: LZMA2
packing: Ultra
generate solid Archive: yes

encryption method: AES - 256 Bit

This are the Options I use.

With small files like 50MB there is no Problem.
But when I wanted to encrypt a large file like an 800MB or several files which have togehter a large file size or so than I will get only a small 1KB file.

But after some test I think I have found the Problem Kombination:
When I use the Methode LZMA2 AND one of the following Options for packing: Ultra, Maximum or normal, than I get this error.
When I use fast or None, than I haven’t this problem.

So I think there is an error in the packing method Ultra, Maximum and normal with the LZMA2 method

But my Problem is, that I can not use the new PA format because I load this encrypted file to an webhoster so other Users from my Forum can download them. This archives are Game Mods.

And not everyone from my Forum use powerarchiver.
So I use a file format which can open from other archive programs too like 7zip.
So my favorite target Format is 7-zip. And I use LZMA2 and Ultra because the higher compression rate.

With powerarchiver 2016 I didn’t have this Problems. With 2016 everything works fine with the same Options I described above.

So I will use 7-zip, LZMA2 and fast Options at the moment.

Thanks.
Michael Duss

spwolf

@mduss lets try this - right click on files in explorer and pick compress with options… now try same combination, does it work? It actually should work, there was some fix implemented in main PA, maybe not in paes.exe.

Also, for testing purposes, can you use pa/extreme for same file, just so we can see what is the size difference between PA and 7z?

thanks!

MDuss

@spwolf said in encryption didn't work correctly:

@mduss lets try this - right click on files in explorer and pick compress with options… now try same combination, does it work? It actually should work, there was some fix implemented in main PA, maybe not in paes.exe.

Also, for testing purposes, can you use pa/extreme for same file, just so we can see what is the size difference between PA and 7z?

thanks!

Hi spwolf.

The method with “compress with options” works very well. Here I have no problems.
So the Problem seems to be the paes.exe.

The differences between pa/extrem and 7-zip LZMA2/Ultra are very small.
Depending on the used files the differences are 1 till 2 MB.
Here the Files had a complete size from 323MB and they were multiple files with difference file Format like .exe, .pdf and so on. The pa file was 2 till 3 MB smaller.

With an other file I had a difference from 8MB. This was an single .zip archiv with 810MB witch I have encrypted with the Explorer Kontext "compress to…"
The filesize was 810MB. And here the pa file was 8MB smaller.

So I think the paes.exe needs an fix.

By the way.
Do you have any Infos regarding this Problem?
https://forums.powerarchiver.com/topic/5814/powerarchiver-outlook-plug-in-don-t-works-correctly/3

Thanks very much.
Michael Duss

spwolf

@mduss not yet for PAOP, we will update bug when fixed. Thanks for the rest of it, entered it for one of the next release.