Which of the following is considered the weakest mode of DES

Which of the following is considered the weakest mode of DES?

A. Electronic Code Book

B. Cipher Block Chaining

C. Cipher Feedback

D. Output Feedback

Solution

Electronic code book is the weakest mode of DES.

The reason is as follows:

Though it is the quickest method but there is no additional security in ECB as it generates the same output everytime using the key.

It is the simplest form of DES unlike others.