Normally, you would encrypt data for transmission via an unsecure network (read: internet) or to protect it from unauthorized physical access. It's not like OBL's biggest worries were the contents of his USB sticks should hostile individuals be present in his home. History certainly supports that theory...
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Well, if you are flying at orbital speeds because you have the nose up there, it's about 40km of difference...
Normally, you would encrypt data for transmission via an unsecure network (read: internet) or to protect it from unauthorized physical access. It's not like OBL's biggest worries were the contents of his USB sticks should hostile individuals be present in his home. History certainly supports that theory ...