CWSP, CWNA, CWTS, Security+, Server+, Network+, A+, DHTI+, PDI+, MSIT InfoSec (CNSS 4011, 4013) 12-08-2011  04:48 PM #2 A cipher can be either symmetric or asymmetric in its keying operation. A cipher can also be either block or stream in its data ingestion operation. For any given cipher, you should memorize