"Ghost" IBM Thinkpad drive

[Gerald Combs]

david nicol wrote:
> On Tue, 2004-05-18 at 10:53, Jason Clinton wrote:
> 
> 
>>This doesn't compress the exchange but it does compress the storage. If
>>you have more CPU power on the source you could move the gzip to the
>>other side:
>>
>>dd if=/dev/hda | gzip --fast -c | ssh user at remote "cat > file"
> 
> 
> 
> I have this idea that ssh does some compression as it encrypts.  I
> think I am confusing it with PGP.

Compression can help encryption in two ways (that I know of, at least):
it changes the message size, and it randomizes the message contents.
Both gnupg (-z) and openssh (-C) support compression.