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1. Universally unique identifier

   http://en.wikipedia.org/wiki/Universally_Unique_Identifier

   + (NSString *)randomString {
       CFUUIDRef cfuuid = CFUUIDCreate (kCFAllocatorDefault);
       NSString *uuid = (NSString *)CFUUIDCreateString (kCFAllocatorDefault, cfuuid);
       CFRelease (cfuuid);
       return [uuid autorelease];
   }
   

   CFC4B6BA-26C9-4149-89C1-77C2C4865A72

   See also $ uuidgen