Data Compression: Which one is Better "Compress before Encrypt" or "Encrypt before Compression" Which one is better approach do data compression before encrypting it  or Encrypt data before compression ? I think it is biased towards the application requirement.  Please share your views.
Compressing encrypted data doesn't work.  Encrypted data looks pseudorandom, therefore if you try to compress it, you'll find that the compression is ineffective.

Try it.  You'll see.  It's a very simple experiment -- give it a try.