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What kind of Zip file encryption supported? Options · View
Guest
#1 Posted : Saturday, August 15, 2009 10:24:38 AM
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What kind of Zip file encryption supported?
ruslan
#2 Posted : Saturday, August 15, 2009 10:25:21 AM
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SQLBackupAndFTP provides 2 encryption methods (Prof version only):

1. ZIP compatible.
It supports a simple password-based symmetric encryption. Note that it provides basic encryption only and is vulnerable to known-plaintext attacks. You can use built-in Windows compressor to open backups encrypted using ZIP compatible encryption method.

2. WinZip AES.
AES is a strong encryption standard adopted by the U.S. government. Built-in Windows compressor does not support AES files, so you have to use 7Zip (freeware) or WinZip 9.0 (or higher) to open backups encrypted using WinZip AES encryption method.

Also, note that backup files over 2 GB are zipped using Zip64 format.
Built-in Windows compressor does not support Zip64, so use 7Zip (freeware) or other archiver to uncompress it.
nickwelhar
#3 Posted : Friday, December 9, 2016 12:06:50 AM
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From examining the p7zip source code, it appears that AES encoding for the 7-zip format operates in CBC mode. This is certainly not necessarily insecure; it's the mode most popularly used in protocols such as TLS, but it is potentially vulnerable to padding oracle attacks.

Nick
Alexander Omelchenko
#4 Posted : Friday, December 9, 2016 11:55:14 AM
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Thanks for the feedback!
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