Which of the following statements pertaining to block ciphers is incorrect?

A.
It operates on fixed-size blocks of plaintext

B.
It is more suitable for software than hardware implementations

C.
Plain text is encrypted with a public key and decrypted with a private key

D.
Block ciphers can be operated as a stream

Explanation:
“Strong and efficient block cryptosystems use random key values so an attacker
cannot find a pattern as to which S-boxes are chosen and used.” Pg. 481 Shon Harris CISSP
Certification All-in-One Exam Guide
Not A:
“When a block cipher algorithm is used for encryption and decryption purposes, the message is
divided into blocks of bits. These blocks are then put through substitution, transposition, and other
mathematical functions, on block at a time.” Pg. 480 Shon Harris CISSP Certification All-in-One
Exam Guide
Not B:
“Block ciphers are easier to implement in software because they work with blocks of data that the
software is used to work with.” Pg 483 Shon Harris CISSP Certification All-in-One Exam Guide
Not D:

“This encryption continues until the plaintext is exhausted.” Pg. 196 Krutz The CISSP Prep Guide.