__________ are typically stored as sets of individual characters, with each character represented by a code.

Placeholders for predefined headers and footers begin with ________

A) @ B) # C) & D) $

Answer the following statements true (T) or false (F)

11. Public-key cryptography is asymmetric. 12. Public-key algorithms are based on simple operations on bit patterns. 13. The purpose of the DSS algorithm is to enable two users to securely reach agreement about a shared secret that can be used as a secret key for subsequent symmetric encryption of messages. 14. An important element in many computer security services and applications is the use of cryptographic algorithms. 15. Some form of protocol is needed for public-key distribution.