Suggestions for a cheap/free .NET library for doing Zip with AES encryption?

Question

I'm trying to find an zip compression and encryption component with encryption suitable for use by the US Federal Government, so I can't use Zip 2.0 encryption, it has to be AES or the like. I've already found SharpZipLib (can't do AES encyrption), and Chilkat (can do AES encryption, but costs money). Am I missing any other options?

Answer 1

How much would you be willing to pay for AES in DotNetZip? ;)

DotNetZip supports AES Encryption, with 128 or 256-bit keys.

http://www.codeplex.com/DotNetZip

Example code:

  using (ZipFile zip = new ZipFile())
  {
    zip.AddFile("ReadMe.txt"); // no password for this entry

    // use a password for subsequent entries
    zip.Password= "This.Encryption.is.FIPS.197.Compliant!";
    zip.Encryption= EncryptionAlgorithm.WinZipAes256;
    zip.AddFile("Rawdata-2008-12-18.csv");
    zip.Save("Backup-AES-Encrypted.zip");
  }

The AES-encrypted zip files produced by DotNetZip can be read and extracted by WinZip, and vice-versa.

You can also just create regular zip files without encryption.

oh, and it's free.