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Subject: How many bit encryptions is used for the password protection

By: Customer

10/10-2004 23:12

I would like to know how many bit encryptions is used for the password protection function?

How secure is the zip password function in comparison with other zip program such as WinRAR or WinZip?


By: Datahjaelp

10/10-2004 23:23

Zip Backup to CD uses traditional password-based encryption and authentication, which is not a strong encryption.
The basic problem with improved encryption is that it conflicts with the zip file format. If you create an encrypted zip file with strong encryption you've got a file no other zip program can read except from the program which created the zip file.

If you use the traditional password-based encryption standard in other programs, which creates files that, can be read with different zip programs they all have the same weak encryption. If you use a zip program with strong encryption you have compatibility problems.

There are known issues with the different strong encryptions used in zip files, a paper making an analyses of the encryption used in WinZip can be found at:
http://www.cs.ucsd.edu/users/tkohno/papers/WinZip/winzip.pdf




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