very similar keys generated

Hi,

While working with the j2ssh code that generate public/private key
pairs, I noticed that the public keys generated all have most of the
bits identical.  
For example, here are 3 public keys that where generated by running
the test program 3 times:


ssh-dss
AAAAB3NzaC1kc3MAAACBAP1/U4EddRIpUt9KnC7s5Of2EbdSPO9EAMMeP4C2USZpRV1AIlH7WT2NWPq/xfW6MPbLm1Vs14E7gB00b/JmYLdrmVClpJ+f6AR7ECLCT7up1/63xhv4O1fnxqimFQ8E+4P208UewwI1VBNaFpEy9nXzrith1yrv8iIDGZ3RSAHHAAAAFQCXYFCPFSMLzLKSuYKi64QL8Fgc9QAAAIEA9+GghdabPd7LvKtcNrhXuXmUr7v6OuqC+VdMCz0HgmdRWVeOutRZT+ZxBxCBgLRJFnEj6EwoFhO3zwkyjMim4TwWeotUfI0o4KOuHiuzpnWRbqN/C/ohNWLx+2J6ASQ7zKTxvqhRkImog9/hWuWfBpKLZl6Ae1UlZAFMO/7PSSoAAACACNp4C+sKDt07HEFCxLHYqeGTRebIxdpzIALEDp8x3P8RaII7rUgIRhTZIeWSWXGsDom38WIMAdX5AO8fc6HRGkO8j1uSVFdIZYBkNHxNohPrZ4yWJ7pto0EUW+x0da8YVaORzarnxejO8AwDhBDqWXLRnn1AK2eZii9DZ3lkJKI=andre@arsenic

ssh-dss
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andre@arsenic

ssh-dss
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andre@arsenic



If you look at the above keys, you will notice that only the end of
the key differs.

Is this normal behavior?  Is there a random seed I can set somewhere
that will make the keys more 'random'?

The code that was used to generate the keys is:

    try
    {
      String keyType = "ssh-dss";
      SshKeyPair pair = SshKeyPairFactory.newInstance(keyType);
      SshKeyPairFactory.initialize();
      pair.generate(1024);
      
      SshPublicKeyFile pub =
      SshPublicKeyFile.create(pair.getPublicKey(),
      new OpenSSHPublicKeyFormat());
      
      System.out.print(pub.toString());
    }
    catch(Exception e)
    {
      log.error(e);
    }



Thanks.
-- 
Andre Charbonneau

100 Sussex Drive, Rm 2025
Research Computing Support, IMSB
National Research Council Canada
Ottawa, ON, Canada K1A 0R6
613-993-3129  Fax: 613-993-3127     


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