key/block sizes

Question 1

WPA -

Answer 1

128-bit key (RC4 stream cipher + TKIP)

Question 2

WEP -

Answer 2

40 bit key (RC4 stream cipher)

Question 3

PRESENT

Answer 3

Block Size 64
Key size 80/128
Rounds 32
Lightweight equivalent to AES, RC5 more standardized

Question 4

One of the 1st considered as an AES replacement for use in light-weight implementations. Beaten to it by RC5.

Answer 4

PRESENT

Question 5

RC5

Answer 5

Block size 32, 64, or 128

Key size 0-2048

Question 6

RSA

Answer 6

key size 1024-4096

Question 7

Only 3 that don’t exclusive use 64 block size

Answer 7

AES, RC5, SIMON

Question 8

DES

Answer 8

Block size 64
Key size 56
Rounds 16

Question 9

3DES

Answer 9

Block size 64
Key size 112 or 168
Rounds 48

Question 10

IDEA

Answer 10

64-bit blocks
128-bit key
17+ rounds

Intended to replace DES, similar to AES but with smaller block and more rounds

Question 11

Blowfish/twofish

Answer 11

128-, 192- or a 256-bit encryption key

Question 12

Skipjack

Answer 12

64-bit data blocks

80-bit key

Question 13

AES 192 bit key

Answer 13

128 block

rounds 12

Question 14

AES 128 bit key

Answer 14

128 block

rounds 10

Question 15

XTEA

Answer 15

64 block
128 key
lightweight

Question 16

WPA-2

Answer 16

128 block

128-bit/256-bit AES

Question 17

What did TKIP do?

Answer 17

It circumvented the RC4 40-bit key size limitation of WEP, allowing 128 bit keys

Question 18

WPA IV size

Answer 18

48 bits

Question 19

WEP IV size

Answer 19

24 bits

Question 20

Bitcoins use Elliptic Curve cryptography with __-byte private keys (which is a random number) and __-byte public keys, on a secp256k1
curve.

Answer 20

32 (256 bit)

64 (512 bit)

Question 21

The only 32 bit block algorithm

Answer 21

RC5

Question 22

Only 3 128 bit block

Answer 22

AES

PRESENT

Question 23

Which symmetric encryption technique uses a 56-bit key size and a 64-bit block size?

Answer 23

DES

Question 24

GSM uses what?

Answer 24

GSM uses the A5/1 or A5/2 STREAM cipher.

Question 25

Which wireless security standard uses a 128-bit RC4 stream cipher for encrypted communications?

Answer 25

WPA

Question 26

3GPP uses what?

Answer 26

3GPP uses A5/3 BLOCK cipher.