Because of the efficiency of public-key cryptosystems, they are
almost always used for the direct encryption of sizable blocks of dat
A.

Question

Quizplus · Accepted Answer

Public-key cryptosystems are generally slower and less efficient for encrypting large blocks of data directly, so symmetric-key algorithms are typically used for this purpose, with public-key cryptography often used for the secure exchange of the symmetric keys.

Because of the Efficiency of Public-Key Cryptosystems, They Are