compression AND encryption

[Jerry J]

On Jan 21, 2010, at 8:29 PM, stephen barncard wrote:
> 
> So
> on encode - (reverse order on decode)
> 
> 1 compression, then encryption  <--my guess
> 2 encrypting, then compression
> 3 no difference or downside??

I agree with your guess. Most compression algorithms depend on regularities in the data, and encryption hides them. Encrypt first and you would hide the stuff of which compression takes advantage. 

Randomness is next to Godliness.

Cheer,
Jerry Jensen