Codes and Cryptography 2

Question 1

Sender of the message

Answer 1

Source

Question 2

Recipient of the
message.

Answer 2

Receiver

Question 3

The process of
turning thoughts into
communication.

Answer 3

Encoding

Question 4

The process of
turning communication into
thoughts.

Answer 4

Decoding

Question 5

Reply or response to
the message.

Answer 5

Feedback

Question 6

Content of
communication.

Answer 6

Message

Question 7

Vehicle through which
communication travels.

Answer 7

Channel

Question 8

a symbolic way to
represent information

Answer 8

Code

Question 9

Three areas of coding

Answer 9

Data compression
Error-correcting codes
Cryptography

Question 10

the process of reducing the
amount of data needed for the
storage or transmission of a
given piece of information, by the
use of encoding techniques

Answer 10

Data compression

Question 11

are algorithms,
mathematical formulas used to
compress and decompress files.

Answer 11

CODECs

Question 12

CODECs for data

Answer 12

PKZIP

Question 13

CODECs for still images

Answer 13

JPEG,GIF,PNG

Question 14

CODECs for audio

Answer 14

MP3, MP4, AAC

Question 15

CODECs for video

Answer 15

Cinepak, MPEG-2, H.264, VP8

Question 16

Two types of Compression Techniques

Answer 16

Lossless Compression
Lossy Compression

Question 17

No data lost when file is reduced

Answer 17

Lossless Compression

Question 18

used in image, text file and also
use for executable file; Examples: WinZip, 7z, GIF & PNG.

Answer 18

Lossless Compression

Question 19

Small losses in data is tolerable.

Answer 19

Lossy Compression

Question 20

Used in video and audio; Examples: JPEG, MPE

Answer 20

Lossy Compression

Question 21

a condition when the
transmitted information is not
the same as the information
sent.

Answer 21

Error

Question 22

when it
detects an error it tries to put
data back to how it should have
been

Answer 22

Error correction

Question 23

the general
term for correction and error
detection systems.

Answer 23

Error control

Question 24

Types of error detection

Answer 24

Parity Checking
Cyclic Redundancy Check
Longitudinal Redundancy Check
Check Sum

Question 25

One extra bit is sent along with
the original data bits.

Answer 25

Parity Check

Question 26

help to check if any
error occurred in the data during
the transmission.

Answer 26

Parity bits

Question 27

used to verify errors on
identification numbers; A single number generated
using the other characters from
the identification number.

Answer 27

Check Digits

Question 28

the bar code which is the
identification number of a retail
item

Answer 28

Universal Product Code

Question 29

Code printed on retail product
packaging to aid in identifying a
particular item/product

Answer 29

Bar codes

Question 30

Series of thick and thin lines with
numbers at the bottom printed
on the item.

Answer 30

Bar codes

Question 31

Consists of 12 digits; the first 11
characters specify the source of
the item and the product
number.

Answer 31

UPC

Question 32

Who used Ceasar Cipher

Answer 32

Julius Ceasar teh

Question 33

How many alphabet positions does the Ceasar Cipher shifts

Answer 33

3

Question 34

What’s the modular arithmetic of Ceasar Cipher

Answer 34

f(p) = (m + 3 mod 26)

Question 35

Three types of Cryptography

Answer 35

1. Secret Key Cryptography
   (Symmetric)
2. Public Key Cryptography
   (Assymetric)
3. Message Digest (Hashing)