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cissp > Chapter 7 > Flashcards

Chapter 7 Flashcards

1
Q

in asymmetric cryptography, which key is used to encrypt a message?

A

receiver’s public key

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2
Q

Which international standard was created by Rivest, Shamir, and Adleman?

A

RSA public key algorithm

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3
Q

which algorithm relies on a component of set theory known as super-increasing sets, rather than large prime numbers?

A

Merkle-Hellman

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4
Q

this algorithm is an extension of Diffie-Hallman, but its major disadvantage is that it doubles the size of any message that it encrypts

A

ElGamal

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5
Q

this algorithm involves the equation Q = xP; and even if Q and P are known, x is incredibly difficult to solve. The major advantage of this algorithm is that you do not need a large key size to obtain the same amount of security as very large keys used in other algorithms

A

Elliptic Curve

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6
Q

this algorithm relies on the ability of two users to generate a shared secret that they both know without ever actually transmitting it, and is used to set up TLS

A

Diffie-Hellman Key Exchange

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7
Q

5 requirements of hash functions

A
  1. input can be any length
  2. output is fixed length
  3. relatively easy to compute
  4. one-way function
  5. collision resistant
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8
Q

block size of HAVAL

A

1024-bit

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9
Q

hash values of HAVAL

A

128, 160, 192, 224, and 256-bits

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10
Q

SHA1 block size

A

512-bits

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11
Q

SHA-1 message digest size

A

160-bit

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12
Q

SHA-256 message digest size

A

256-bit

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13
Q

SHA-256 block size

A

512-bit

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14
Q

SHA-224 block size

A

512-bits

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15
Q

SHA-224 message digest size

A

224-bits

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16
Q

SHA-512 message digest size

A

512

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17
Q

SHA-512 block size

A

1024

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18
Q

SHA-384 message digest size

A

384

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19
Q

SHA-384 block size

A

1024-bits

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20
Q

which algorithm is the SHA-3 standard

A

Keccak

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21
Q

This standard provides the same security as SHA-2, but is slower so it is not commonly used

A

SHA-3

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22
Q

This hash algorithm was developed by Ronald Rivest, but collisions are possible

A

MD2, MD4, MD5

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23
Q

MD5 block size

A

512

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24
Q

MD5 message digest length

A

128 bits

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25
Q

what group of hashing functions is used as an alternative to SHA?

A

RIPEMD

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26
Q

RIPEMD message digest length

A

128-bit

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27
Q

Which variant of RIPEMD is still secure today?

A

RIPEMD-160

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28
Q

Which two major concepts do digital signature algorithms rely on?

A

public key encryption and hashing functions

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29
Q

4 steps of sending a digitally signed message

A
  1. hash the message
  2. encrypt the message digest using private key - this is the signature
  3. appends signature to plaintext message
  4. send the messages
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30
Q

3 steps of validating digital signatures.

A
  1. decrypt digital signature using sender’s public key
  2. hash the plaintext message
  3. compare the decrypted digest to the new digest to make sure they are the same
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31
Q

Which aspect of the CIA triad do digital signatures alone not address, and how can it be acheived?

A

they do not provide confidentiality. It can be acheived by encrypting the signed message with the receiver’s public key.

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32
Q

this signature algorithm is a partial digital signature. it guarantees the integrity of a message but not nonrepudiation.

A

HMAC

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33
Q

what is the FIPS standard for digital signatures?

A

DSS - Digital Signature Standard

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34
Q

what is the DSS for hashing functions?

A

SHA-3

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35
Q

what are the 3 acceptable DSS encryption algorithms?

A

DSA (Digital Signature Algorithm)
RSA
ECDSA

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36
Q

what are endorsed copies of a public key?

A

digital certificates

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37
Q

what is the international standard for digital certificates?

A

X.509

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38
Q

what information is included on a X.509 certificate? (7 items)

A
  1. version of X.509
  2. serial number
  3. signature algorithm
  4. issuer name (name of CA)
  5. validity period
  6. subject name (CN, DN)
  7. subject’s public key
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39
Q

what entities assist CAs by allowing them to remotely validate user identities?

A

Registration Authorities (RAs)

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40
Q

how do CAs protect their root certificates?

A

using an offline CA that is used as needed to create intermediate CAs

41
Q

3 Certificate Lifecycle steps

A
  1. Enrollment
  2. Verification
  3. Revocation
42
Q

which step of the certificate lifecycle involves proving your identity to the CA?

A
  1. Enrollment
43
Q

which step of the certificate lifecycle involves the certificate signing request?

A
  1. Enrollment
44
Q

which kind of certificate does the CA verify that the certificate subject has control of the domain name?

A

Domain validation certificate (DV)

45
Q

which kind of certificate does the CA take steps to verify that the certificate owner is a legitimate business before issuing the certificate?

A

Extended Validation (EV) certificate

46
Q

which step of the certificate lifecycle involves checking the validity of the various components of a certificate?

A

Verification

47
Q

which protocol is used to check if certificates have been revoked?

A

OCSP (Online Certificate Status Protocol)

48
Q

what do CAs distribute to revoke groups of certificates?

A

CRL - Certificate Revocation Lists

49
Q

when browsers attach a certificate to a subject for an extended period of time

A

certificate pinning

50
Q

this is an extension to the OCSP; where the web server sends clients a timestamped response from an OCSP server to alleviate some of the burden of all the clients individually sending requests

A

Certificate Stapling

51
Q

maximum response time within which a CA will perform a requested revocation

A

revocation request grace period

52
Q

4 reasons to revoke a certificate

A
  1. certificate was compromised
  2. erroneously issued
  3. details changed
  4. security association changed
53
Q

4 digital certificate formats

A

Distinguished Encoding Rules (DER)
Privacy Enhanced Mail (PEM)
Personal Information Exchange (PFX)
P7B

54
Q

Binary digital certificate formats (2)

A

DER and PFX

55
Q

Text digital certificate formats (2)

A

PEM and P7B

56
Q

.der digital certificate format

A

DER - Digital Encoding Rules

57
Q

.crt Digital certificate format

A

DER - Distinguished Encoding Rules
PEM - Privacy Enhanced Mail

58
Q

.cer digital certificate format

A

DER - Distinguished Encoding Rules

59
Q

.pem digital certificate format

A

PEM - Privacy Enhanced Mail

60
Q
A
61
Q

.pfx digital certificate format

A

PFX - Personal Information Exchange

62
Q

.p12 digital certificate format

A

PFX - Personal Information Exchange

63
Q

most common binary digital certificate format

A

DER - Digital Encoding Rules

64
Q

ASCII text version of DER format

A

PEM - Privacy Enhanced Mail

65
Q

can you tell if a .crt file is binary or text without looking at the contents of the file?

A

No, this extension is used for both DER (binary) and PEM (text) formats,

66
Q

digital certificate that is commonly used by windows systems

A

PFX - Personal Information Exchange

67
Q

ASCII text Windows digital certificate format

A

P7B

68
Q

most well known example of hybrid cryptography

A

TLS - Transport Layer Security

69
Q

in hybrid cryptography, what method is used to distribute keys?

A

asymmetric/public key cryptography

70
Q

a chip that resides on the motherboard of the devices that can store and manage keys used for full disk encryption

A

TPM - Trusted Platform Module

71
Q

which secure email system combines the CA hierarchy with the “web of trust”

A

PGP - Pretty Good Privacy

72
Q

which secure email system uses the RSA encryption algorithm?

A

S/MIME

73
Q

How can you protect your organization from POODLE attacks?

A

Only allow connections to sites using TLS (via active directory browser configurations or a proxy)

74
Q

what is the minimum secure version of TLS?

A

TLS 1.2

75
Q

hiding messages within another message by altering the least significant bits

A

steganography

76
Q

two methods of circuit encryption

A
  1. Link encryption
  2. end-to-end encryption
77
Q

which type of circuit encryption encrypts the header data?

A

link encryption

78
Q

which kind of encryption is SSH?

A

end-to-end

79
Q

what are the two big components of an IPsec connection?

A

AH - Authentication Header
ESP - Encapsulating Security Payload

80
Q

which part of IPsec provides message integrity and non-repudiation?

A

AH - Authentication Header

81
Q

which part of IPsec provides confidentiality with encryption?

A

Encapsulating Security Payload (ESP)

82
Q

IPsec modes of operation

A

transport mode - only the payload is encrypted (end-to-end encryption)
tunnel mode - header is encrypted (link encryption)

83
Q

a distributed and immutable public ledger

A

blockchain

84
Q

cryptography in situations where computing power and energy are limited

A

lightweight cryptography

85
Q

purpose of homomorphic encryption

A

being able to perform calculations on data that may include PII or PHI so that the data is never revealed to the researcher.

86
Q

attacks that use algebraic manipulation to reduce the complexity of the algorithm

A

analytic attack

87
Q

exploits weaknesses in the implementation of a crypto system - exploits the software code used to program the encryption

A

implementation attack

88
Q

exploits statistical weaknesses in a cryptosystem

A

statistical attack

89
Q

compromising the integrity of a device by causing some kind of external fault (high-voltage, temperature extremes) to induce a malfunction

A

fault injection attack

90
Q

using information like power consumption or EM radiation to monitor system activity and retrieve information that is actively being encrypted

A

Side-Channel Attack

91
Q

a random value added to the end of a password before the OS hashes the password

A

salt

92
Q

counting the number of times each letter appears in the cipher text and using knowledge of language and frequently used letters to attempt to crack cyphertext

A

freqency analysis/ciphertext-only attack

93
Q

attack cracks an encryption code by having both a ciphertext and plain text version of a message

A

known plaintext attack

94
Q

attacker obtains the ciphertexts corresponding to a set of plaintexts of their own choosing in order to derive the key used

A

chosen plaintext

95
Q

attacker decrypts chosen portions of the ciphertext message to discover the key

A

chosen ciphertext

96
Q

attacker encrypts plaintext message using every possible key (k1) and the ciphertext is decrypted using all possible keys (k2). When a match is found, the key pair is used to defeat the double encryption method in use.

A

Meet in the Middle

97
Q

attacker intercepts all communications between two parties, including the setup of a cryptographic session

A

man in the middle

98
Q

attacker finds flaws in a hashing function where two inputs can produce the same output

A

Birthday attack, collision attak, reverse hash matching

99
Q

attacker intercepts a request for authentication and then replays the captured message to open a new session

A

replay attack

cissp (13 decks)

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