A __________ cipher processes the input one block of elements at a time, producing an output block for each input block, whereas a stream cipher processes the input elements continuously, producing output one element at a time.

Which of the following block ciphers XORs each block of plaintext with the previous block of ciphertext before being encrypted?

A. Electronic Code Book (ECB) B. Galois/Counter (GCM) C. Counter (CTR) D. Cipher Block Chaining (CBC)

The ____________________ lets you see the effect before you apply it to your presentation.

Fill in the blank(s) with the appropriate word(s).