Symmetric Encryption Sec+

Front 1

What is another name for symmetric encryption

Back 1

Secret key

Front 2

what is another word for asymmetric encryption

Back 2

Public key

Front 3

Symmetric encryption uses how many keys?

Back 3

One

Front 4

Asymmetric encryption uses how many keys?

Back 4

two keys, one public one private

Front 5

What are the strengths of symmetric encryption?

Back 5

it is fasts, difficult to break, and cheaper that asymmetric encryption

Front 6

What are the weaknesses of symmetric encryption?

Back 6

Must be properly secured hence why key is so complex, does not provide authentication.

Front 7

What are some of the strengths of asymmetric encryption?

Back 7

Offers authentication, non-repudiation, and offers better scalability (ability to grow with the system), a more robust key management solution.

Front 8

What are the weaknesses of asymmetric encryption?

Back 8

It is slower.

Front 9

What algorithms are included in Symmetric encryption?

Back 9

DES- Data Encryption Standard
3DES- Triple Data Encryption Standard
AES- Advance Encryption Standard

Front 10

The larger the number of bits......

Back 10

the stronger the encryption

Front 11

What are the features of DES

Back 11

Very fast
Block cipher that is 64 bit blocks, with a key length of 56 bits
Key space is 2 to the power of 56

Front 12

What are the weaknesses of DES?

Back 12

insecure, no longer accepted for government standards
has a weak algorithm

Front 13

What modes does DES operate in?

Back 13

ECB- Electronic Code Book
Cipher Block Chaining Mode
Cipher Feedback
Output feedback

Front 14

How does ECB work?

Back 14

takes a message, divides it into blocks, and then each of he individual blocks are encrypted.

Front 15

How does Cipher Block Chaining Mode work?

Back 15

takes each block of plain text and exclusive ORs it with the previous cipher test block before it is encrypted

Front 16

How does Cipher Feedback work?

Back 16

makes a block of cipher into a self-synchronizing stream cipher

Front 17

How does Output Feedback work?

Back 17

takes a block of cipher and makes it into a synchronous stream cipher

Front 18

What are the features of 3DES

Back 18

-Uses three 56-bit keys, encrypts data three times with three keys
-Easy to implement on hardware and software
-Based on the trusted cipher which was the original Data Encryption Standard

Front 19

What are the weaknesses of 3DES?

Back 19

known to cause heavy performance issues
transmission of the keys are deemed unsafe

Front 20

What modes does 3DES work in?

Back 20

DES EEE3
DES EDE3
DES EEE2
DES EDE2

Front 21

DES EEE3

Back 21

uses three different keys for encryption

Front 22

DES EDE3

Back 22

plain text is encrypted with one key
goes through a decryption process with key two
then its encrypted with key three

Front 23

DES EEE2

Back 23

encrypted with one key
encrypted with the second key
encrypted with the first key again

Front 24

DES EDE2

Back 24

uses only two keys
the first and third keys are used for encryption, key two is used for decryption

Front 25

What is AES?

Back 25

Advanced Encryption Standard, a symmetric block cipher based on Rijndael algorithm.

Front 26

What are the features of AES?

Back 26

Key lengths can be 128, 192, or 256 bits
Block size can be 128, 192, 256 bits
10 to 14 computational rounds if both key and block size then: 10 for 128, 12 for 192, 14 for 256

Front 27

What are the four stages of encryption for AES?

Back 27

Add Round Key
Sub Bytes
Shift Rows
Mix Columns

Front 28

Add Round Key

Back 28

each byte of the state is combined with a block of the round key using the bitwise exclusive OR

Front 29

Sub Bytes

Back 29

is another linear substitution step where each byte us replaced with another according to a specific look-up table

Front 30

Shift Rows

Back 30

is a transposition step where the last three rows of the state are shifted in normal position a certain number of steps

Front 31

Mix Columns

Back 31

a mixing operation which operates on the columns of the state, combining the four bytes in each column

Front 32

What are the advantages of AES?

Back 32

-key lengths 192, or 256 can provide a high level of security
-Can be implemented in a wide range of processors, hardware, and enviornments
-low memory requirements
-can defend against timing attacks

Front 33

What are the disadvantages of AES?

Back 33

low number of computational rounds

Front 34

CCMP (symmetric key algorithm)

Back 34

Counter Mode Cipher Block Chaining Message Authentication Code Protocol
-an encryption protocol for wireless LAN protocols
-128, 192, and 256 bit keys

Front 35

CAST (symmetric key algorithm)

Back 35

block cipher

Front 36

SAFER (symmetric key algorithm)

Back 36

Secure and Fast Encryption Routine

Front 37

Blowfish (symmetric key algorithm)

Back 37

uses a 64-bit block size with variable key length anywhere from 32 bits through 448 bits

Front 38

Twofish (symmetric key algorithm)

Back 38

uses 128 block size and keys of up to 256 bits

Front 39

RC4

Back 39

most widely used software