SyncBackPro - Zip encrypted filenames issue

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robinkeir
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SyncBackPro - Zip encrypted filenames issue

Post by robinkeir » Tue May 08, 2018 12:37 pm

I have a profile to mirror source to a ZIP file. The ZIP is encrypted. All works fine and the resultant ZIP is able to be opened with all the regular ZIP tools (7zip etc). However, if I enable "Encrypt and compress the filenames and details" the resultant ZIP file is not able to be processed with any tool I have used. I have tried 7zip, WinRAR and WinZIp. All latest versions. They all produce errors and cannot process the file. Is there something I'm missing in this regard?

Relevant settings:

Compression
- Compress the files on Destination into a Zip file
- Put all files into a single compressed file
- Type of compression - Deflated - Standard compression algorithm
- Level of compression - 7 - High compression

- Encryption
- Encryption method - WinZip 9 compatible AES encryption (256 bits)
- Encrypt and compress the filenames and details [checked]

cliffhanger
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Re: SyncBackPro - Zip encrypted filenames issue

Post by cliffhanger » Tue May 08, 2018 1:39 pm

HI, it seems that the name-encryption facility in SB is based on PKware's SecureZip - see the contextual Help on the Compression > Encryption settings page (my underlining)

Encrypt and compress the filenames and details: SyncBack can optionally encrypt and compress the filenames and file details in the Zip file. By doing this, anyone who opens the Zip file (to see the file list) will be unable to see anything without knowing the password. This encryption method is compatible with PKWare SecureZip. It is not compatible with the same feature in WinZip and 7-Zip.To use this option some other options must be set first: all files must be put into a single Zip file, the Deflated or BZip2 compression method must be used, the encryption method must be AES, split or spanned Zip files cannot be used, self-extracting Zip files cannot be used and the compression level must be greater than zero (i.e. it must be compressed).

From memory (during the V8 beta stages) I tried SecureZip's free reader, which worked fine to decrypt (extract) the files but doesn't support displaying the filenames stored inside the Zip. Ipso facto, you would need to extract all of them at once with the free SZ reader because there is no way in the reader to select a specific file or files. IIRC you need the full version of SecureZip (approx $40 last time I checked) if you need a standalone solution. Or, you can of course use SB SE/Pro in Restore mode.

Note: this was the extent of my testing - it's not something I use in my own system, so I probably cannot assist you further than the Help file can.

robinkeir
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Re: SyncBackPro - Zip encrypted filenames issue

Post by robinkeir » Tue May 08, 2018 6:57 pm

Excellent information. Thanks! I had not come across this in the help.

It is a bit of a shame that the more prevalent and industry-standard filename encryption, as found in 7zip, WinZIP etc was not used. But now I know the limitations I'm OK with that.

robinkeir
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Re: SyncBackPro - Zip encrypted filenames issue

Post by robinkeir » Tue May 08, 2018 8:37 pm

And to follow up - SecureZIP 30 day trial of full version - when opening the archive it prompts for a password so you can then view all of the file names in their plain text form.

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