CompTIA Security+ Question D-97

A network stream needs to be encrypted. Emily, the network administrator, has selected a cipher which will encrypt 8 bits at a time before sending the data across the network. Which of the following has Emily selected?

A. Block cipher
B. Stream cipher
D. Hashing algorithm

Answer: A

With a block cipher the algorithm works on chunks of data—encrypting one and then moving to the next. Example: Blowfish is an encryption system that performs a 64-bit block cipher at very fast speeds.