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.
-
@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!
-
@spwolf
File sent as unencrypted .pa and sample encrypted zip file
-
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-2018-18-00-37Please check it out and let us know if it works properly now.
-
@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.
