Codes and Cryptography 1

Question 1

The act of giving, receiving, and
sharing information

Answer 1

Communication

Question 2

the transfer of messages
(information) among people
and/or machines through the
use of technology such as
telephone, radio, television, and
internet.

Answer 2

Communication technology

Question 3

the process of
making and using codes to
secure transmission of
information.

Answer 3

Cryptography

Question 4

converting
original message into a form
unreadable by unauthorized
individual

Answer 4

Encryption

Question 5

conversion of
encrypted data into its original
form.

Answer 5

Decryption

Question 6

Sometimes referred to as
modulus arithmetic or clock
arithmetic.

Answer 6

Modular arithmetic

Question 7

the remainder when
dividing

Answer 7

Modular arithmetic/modulo operation

Question 8

How many solutions when a and n CAN’T be evenly divided by the GCD

Answer 8

No solution

Question 9

What are the two cases when the linear congruence has one solution?

Answer 9

Case 1: If a divides n
Case 2: If GCD = 1

Question 10

How would you know that there are three or more solution?

Answer 10

If and only if the GCD of a and n divides b and the GCD is 3 or higher