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cryptocalss > misc > Flashcards

misc Flashcards

1
Q

3GPP uses what?

A

3GPP uses A5/3 BLOCK cipher.

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2
Q

GSM uses what?

A

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

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3
Q

Only two 128 bit key

A

AES

PRESENT

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4
Q

Two biggest max key size

A

RC5 - 2048

RSA - 4096

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5
Q

PRESENT block, key, rounds

A

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

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6
Q

DES block key rounds

A

Block Size 64
Key size 56
Rounds 16

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7
Q

IDEA block key round

A

Block Size 64
Key size 128
Rounds 17+

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8
Q

3DES block key rounds

A

Block Size 64
Key size 112
Rounds 48

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9
Q

Skipjack

A

64-bit data blocks

80-bit key

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10
Q

XTEA

A

64 block
128 key
lightweight

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11
Q

IKE uses what two underlying technologies?

A

PKI

Diffie-Hellman

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12
Q

PEM

A 
One of the two encoding schemes for X.509 certificates;
•Base64 
•ASCII text
•.key .crt .cer
•SSH-RSA
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13
Q

what is DER

A

One of the two encoding schemes for X.509 certificates;
•binary
•human unreadable
•.cer .der

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14
Q

lightweight asymmetric cryptography used for RFID, has diff-helman

A

Elli

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15
Q

HMAC is created with what hash typically?

A

SHA-1, MD-5, Chaskey

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16
Q

one-way hashing method

protects against an adaptive chosen ciphertext attack.

A

Cramer-Shoup

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17
Q

MD5/MD4 output size?

A

128 bits

18
Q

SHA-1 output size?

A

160

19
Q

x5 faster than SHA-256

meant for short message hashing.

A

lesamnta-LW

20
Q

Quark output size?

A

64, 112

21
Q

What is Quark used for besides hashing?

A

stream cipher encryption

22
Q

Chaskey key size and use?

A

128

Lightweight MAC key signing for IoT

23
Q

64/112 bit output

A

Quark

24
Q

160 bit output

A

SHA-1

25
Q

128 bit output

A

MD5

26
Q

permutation vs combination?

A

combination - not concerned with the order

permutation - sequence matters

27
Q

Traits of a good Pseudorandom Number Generator (PRNG)

A

Uncorrelated sequences and Long period

28
Q

S-box

A
  • obscure the relationship between the key and the ciphertext through XOR
  • confusion.
  • substitution.
  • lookup tables
29
Q

P-box

A
  • Shuffles the input bits around
  • diffusion.
  • transposed.
30
Q

Which symmetric STREAM cipher is resistant to timing attacks?

A

ChaCha

31
Q

Exhaustive search

A

Where the intruder uses brute force to decrypt the ciphertext and tries every possible key.

32
Q

Chosen-ciphertext.

A

Where the intruder sends a message to the target, this is then encrypted with the target’s private-key and the intruder then analyses the encrypted message.

For example, an intruder may send an e-mail to the encryption file server and the intruder spies on the delivered message.

33
Q

Active attack

A

Where the intruder inserts or modifies messages.

Doesn’t have impersonation

34
Q
  • new message is created with the same hash signature

* direct relation to the original message.

A

Full context.

35
Q
  • alternative message has some significance to the original and generates the same hash signature.
  • This is defined as a Pre-image attack.
A

Similar context.

36
Q

Using (Ephemeral) Elliptic-Curve Diffie-Hellman (ECDHE) protects against?

A

DHE_EXPORT Downgrade attacks

37
Q

difference between chosen ciphertext and known plaintext?

A

chosen ciphertext - actively sends data to be encrypted with the target’s private-key
known plaintext - no sending data, already known

38
Q

Looks for a rollover of the same value for an IV

A

replay attack

39
Q

AES 3 vulnerabilities?

A

Brute force
use of Non-Random Numbers
copy-and-paste

40
Q

Which two block modes are vulnerable to error propegation?

A

CFB, CBC

41
Q

The two “independent” block modes

A

ECB, CTR

42
Q

What is the difference between CFB and OFB?

A

CFB turns the block into a stream cipher/keystream generator and encrypts it bit-by-bit in real time.

OFB has no error propagation because the seed value (IV) is applied BEFORE data becomes ciphertext or the XOR process. Not encrypted real time.

cryptocalss (8 decks)

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