Some AES Encrypted Files extract to a zero-length file

south37

While archiving some emails to upload to the Cloud as encrypted archives, I noticed that when testing the archive, I could not correctly extract the original file. The file would be created but be zero bytes long. The text files I was compressing were approx 100MB long and the archive a zip file with AES128 encryption.

The issue seems to be with AES encryption (128 192 and 256 bit), but the PK 2.04g encryption seems to allow proper file extraction.

I managed to re-produce the issue with an 800k text file that contains random characters; this when encrypted with AES128 would extract to a zero-length file. However a 40MB file containing only repeated “1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ” strings (which compresses to 233kB) encrypts and decrypts ok.

I have only tried this with zip archives.

I am using PA version 18.00.31.

spwolf

Thanks for reporting this issue. At certain settings, zip file header was not set properly, hence the issue.

You can find updated version here:
https://forums.powerarchiver.com/topic/5933/fast-ring-powerarchiver-2018-18-00-37

Please check it out and let us know if it works properly now.

spwolf

@south37 said in Some AES Encrypted Files extract to a zero-length file:

While archiving some emails to upload to the Cloud as encrypted archives, I noticed that when testing the archive, I could not correctly extract the original file. The file would be created but be zero bytes long. The text files I was compressing were approx 100MB long and the archive a zip file with AES128 encryption.

The issue seems to be with AES encryption (128 192 and 256 bit), but the PK 2.04g encryption seems to allow proper file extraction.

I managed to re-produce the issue with an 800k text file that contains random characters; this when encrypted with AES128 would extract to a zero-length file. However a 40MB file containing only repeated “1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ” strings (which compresses to 233kB) encrypts and decrypts ok.

I have only tried this with zip archives.

I am using PA version 18.00.31.

can you please compress that file to .pa and send it over to us at support at conexware dot com. That way we can take a look at it right away.

thank you!

south37

@spwolf
File sent as unencrypted .pa and sample encrypted zip file

spwolf

Thanks for reporting this issue. At certain settings, zip file header was not set properly, hence the issue.

You can find updated version here:
https://forums.powerarchiver.com/topic/5933/fast-ring-powerarchiver-2018-18-00-37

Please check it out and let us know if it works properly now.

south37

@spwolf Just tested the new version with the files that were problematic and they all decrypt and extract ok.

Thanks for the fast fix on this issue.