Grzegorz Jaśkiewicz wrote, On 30-10-08 12:13:
it should, every book on encryption says, that if you compress your data before encryption - its better.
Those books also should mention that you should leave this subject to experts and have numerous examples on systems that follow the book, but are still broken. There are other techniques as well that make breaking it harder, such as the CBC and CTS modes.
Using compression consumes processing power and resources, easing DoS attacks a lot.
Also I still have to see an compression algorithm that can sustain over (or even anything close to, for that matter) 100MB/s on todays COTS hardware. As TOAST provides compression, maybe that data can be transmitted in compressed manner (without recompression).
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