Cryptography Domain (selected)

1 / 25

Which of the following is not a block cipher mode of operation in stream mode?

Electronic Code Book (ECB)

Output Feed Back (OFB)

Counter (CTR)

Cipher Feed Back (CFB)

2 / 25

What is a mathematical encryption operation that cannot be reversed called?

DES

Substitution

Transposition

One-way hash

3 / 25

In block cipher, what creates the element of diffusion

Use of a key scheduler

Permutation using a lookup table

Bit substituting using a S-box

Use of a Feistel networ

4 / 25

Data Encryption Standard (DES) performs how many rounds of permutation and substitution?

56

16

32

5 / 25

Which of the following statements is not true?

TDES has a mode that uses 1 key

TDES has a mode that uses 3 keys

TDES has a mode that uses 2 keys

TDES offers a greater protection over DES

6 / 25

Who vouches for the binding between the data items in a digital certificate?

Issuing authority

Vouching authority

Certificate authority (CA)

Registration authority

7 / 25

What is the primary role of smartcards in a PKI?

Transparent renewal of user keys

Tamperproof, mobile storage and application of private keys of the users

Easy distribution of the certificates between the users

Fast hardware encryption of the raw data

8 / 25

hich of the following are suitable protocols for securing VPN connections?

PKCS#10 and X.509

IPsec and L2TP

TLS and SSL

S/MIME and SSH

9 / 25

Which of the following techniques is used in the encryption of data between a web browser and server?

PGP

IPSec

Kerberos

SSL

10 / 25

Which of the following asymmetric encryption algorithms is based on the difficulty of factoring large numbers?

International Data Encryption Algorithm (IDEA)

El Gamal

RSA

Elliptic Curve Cryptosystems (ECCs)

11 / 25

Which of the following should be used as a replacement for Telnet for secure remote login over an insecure network?

Rlogin

S-Telnet

SSH

SSL

12 / 25

32.The DES encryption scheme has which of the following pair of characteristics?
1. a secret key encryption algorithm
2. a public key encryption algorithm
3. a symmetric key distribution system
4. an asymmetric key distribution

1 and 4

2 and 4

1 and 3

2 and 3

13 / 25

Which of the following is not a mode of the Data Encryption Standard (DES)?

Output Feedback (OFB)

Electronic Code Book (ECB)

Cipher Block Chaining (CBC)

Substitution

14 / 25

Which of the following is not true about DES?

It encrypts 64 bits of text at a time

It is an asymmetric cipher

It uses 16 rounds of transposition and substitution

It has 8 bits for parity in its key

15 / 25

What does AES use S-boxes for during the process of encryption?

Key generation

Key exchange

Substitution

Chaining

16 / 25

What is the result of a hash algorithm being applied to a message?

A digital signature

A ciphertext

A message digest

A plaintext

17 / 25

The RSA algorithm is an example of what type of cryptography?

Private Key

Symmetric key

Asymmetric key

Secret Key

18 / 25

What does S/MIME do?

It provides data security

It adds security to e-mail messages in MIME format

It offers the same functionality as PEM

It provides a secure channel for communication

19 / 25

Which is not an attribute of a one-way trap door?

RSA is based on a trap door one-way function

The forward direction of a one-way function can take seconds to encrypt and the opposite direction can take years to figure out.

it is a mathematical function that is easier to compute in one direction than the opposite direction

One-way function is used in symmetric key cryptography because they have to know about the trap door to decrypt

20 / 25

Which statement is the most accurate?

HTTPS and SHTTP are the same thing

HTTPS is HTTP that is being used over SSL

HTTPS is more robust and secure version of SHTTP

SHTTP is SSL that is being used over HTTP

21 / 25

Which characteristic is not that of a good stream cipher?

Statistically predictable

Statistically unbiased keystream

Keystream is not linearly related to the key

Long periods of no repeating patterns

22 / 25

Of the following, which is the best description of a digital signature

The sender encrypts a message digest with his/her public key

The sender encrypts a message digest with his/her private key

The recipient encrypts a message digest with his/her private key

The recipient encrypts a message digest with his/her public key

23 / 25

What is a public key used for?

It authenticates VPN connections

It authenticates a network interface

It authenticates a covert channel

It authenticates a private key

24 / 25

Which of the following is required for cryptanalysis?

Access to plain text and ciphertext

Access to the plain text

Access to the algorithm source

Access to the cipher text and algorithm source

25 / 25

What technology encrypts the header, trailer and routing information in the communications path?

S/MIME

Data hiding

Link encryption

End-to-end encryption

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