two approaches that use a block cipher to build a PNRG and have gained widespread acceptance are:
A)CtR mode and CFB mode
B)CtR mode and OFB mode
C)CBC mode and CFB mode
D)OFB mode and ECB mode

Question

Quizplus · Accepted Answer

CtR (Counter) mode and OFB (Output Feedback) mode are both used in constructing Pseudo-Random Number Generators (PRNGs) because they can produce a keystream that can be used for cryptographic purposes, including the generation of pseudo-random numbers.

Two Approaches That Use a Block Cipher to Build a PNRG