3. What is the length of the cryptographic key used in the Data Encryption Standard (DES) cryptosystem? A. 56 bits B. 128 bits C. 192 bits D. 256 bits 4. What type of cipher relies upon changing the...

3.
What is the length of the cryptographic key used in the Data Encryption Standard (DES)

cryptosystem?

A.
56 bits

B.
128 bits

C.
192 bits

D.
256 bits

4.
What type of cipher relies upon changing the location of characters within a message to achieve

confidentiality?

A.
Stream cipher

B.
Transposition cipher

C.
Block cipher

D.
Substitution cipher