单项选择题
A. group 3 B. group 1 C. group 5 D. group 7
A. 4 bytes for both B. 4 bytes， and 8 bytes respectively C. 8 bytes for both D. 24 bytes for both
A. Blocking cipher andnon-blocking cipher B. CBC cipher and EBC cipher C. Block cipher and Stream cipher D. Blocker cipher and Streamer cipher E. 3DES cipher and AES cipher