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Cryptography and Information Security Worksheet

Total questions: 100

Worksheet time: 51mins

Name
Class
Date
1.

The science of how to transform (encrypt) information in order to protect it from illegal users (development of ciphers)

a)

cryptography

b)

cryptology

c)

cartography

d)

cryptanalysis

e)

cryptomethod

2.

The key is

a)

the process of converting open data into encrypted data using a cipher

b)

replaceable cipher element that is used to encrypt a specific message

c)

cipher element

d)

ciphertext element

e)

replaceable element

3.

Cryptosystems with a single key

a)

class D

b)

with public key

c)

asymmetrical

d)

with private key

e)

symmetrical

4.

Cryptosystems using two keys

a)

symmetrical

b)

asymmetrical

c)

public key

d)

with private key

e)

Class D

5.

Cryptology is

a)

the science of methods and techniques for breaking ciphers

b)

a science consisting of two branches: cryptography and cryptanalysis

c)

cipher strength

d)

replaceable cipher element

e)

science (and practice of its application) about methods and methods of breaking ciphers (attack on ciphers)

6.

The purpose of identification is

a)

software unification

b)

identifying subtle signs of copyright infringement

c)

identifying clear signs of copyright infringement

d)

analysis of program characteristics

e)

analyzing programming style

7.

Science that deals with the problem of protecting information by transforming it

a)

cryptology

b)

cryptography

c)

cryptanalysis

d)

cartography

e)

steganography

8.

Science engaged in the search and research of mathematical methods for transforming information

a)

cryptology

b)

cryptography

c)

cryptanalysis

d)

cartography

9.

The alphabet is

a)

a finite set of characters used to encode information

b)

an ordered set of elements

c)

an unordered collection of elements

d)

an infinite number of signs used to encode information

e)

ordered set of characters used to decrypt data

10.

In symmetric cryptosystems, for encryption and decryption,

a)

three keys

b)

two keys that are mathematically related to each other

c)

no keys

d)

the same key

e)

two keys that are not related to each other

11.

Crypto resistance is determined ...

a)

the number of all possible keys; average time required for cryptanalysis

b)

the number of all possible keys

c)

the length of the alphabet

d)

the average time required for cryptanalysis

e)

the average time it takes to encrypt

12.

The public key is used to

a)

decrypting information

b)

broadcasting information

c)

encryption of information

d)

copying information

e)

unification of information

13.

Function value φ(7)

a)

1

b)

2

c)

3

d)

5

e)

6

14.

The formula for calculating the Euler function of a prime number p

a)

φ(p)=p

b)

φ(p)=p+1

c)

φ(p)=p-2

d)

φ(p)=p+1

e)

φ(p)=p-1

15.

The number of prime numbers in a row from one to ten

a)

9

b)

5

c)

4

d)

2

e)

8

16.

Euler function value φ(19*17)

a)

220

b)

215

c)

288

d)

270

e)

264

17.

Euler function value φ(6)

a)

1

b)

2

c)

3

d)

5

e)

6

18.

The value of the Euler function of a prime number p is calculated by the formula

a)

φ(p)=p

b)

φ(p)=p-1

c)

φ(p)=p+1

d)

φ(p)=p-2

e)

φ(p)=p+2

19.

The number of primes in the first ten natural numbers

a)

4

b)

5

c)

6

d)

2

e)

9

20.

Prime factorization of 250

a)

2∗532*5^3

b)

2∗522*5^2

c)

2*4*5

d)

2∗3∗522*3*5^2

e)

7*2*3*3

21.

Function value φ(23*13)

a)

220

b)

215

c)

228

d)

270

e)

264

22.

Cryptology is a science that consists of two parts:

a)

cryptography and astrology

b)

cryptanalysis and astrography

c)

cartography and cryptography

d)

cryptography and cryptanalysis

e)

cryptanalysis and synthesis

23.

Cryptography is the science of ...

a)

codes

b)

prime numbers

c)

ciphers

d)

maps

e)

divisibility of numbers

24.

The key in cryptography is

a)

constant cipher element

b)

replaceable cipher element

c)

encryption code

d)

decryption code

e)

an arbitrary number

25.

Calculate (625,250).

a)

50

b)

100

c)

25

d)

125

e)

150

26.

With the help of the sieve of Eratosthenes they find ...

a)

even numbers

b)

odd numbers

c)

multiples of 5

d)

multiples of 7

e)

prime numbers

27.

The canonical decomposition of 288

a)

2*12*12

b)

24*12

c)

2*2*3*3*3

d)

25∗322^5*3^2

e)

8*2*2*9

28.

Given number 75. Which of the numbers will be mutually prime with this number.

a)

25

b)

15

c)

33

d)

39

e)

77

29.

A cryptosystem in which a message is transformed into blocks of a certain length

a)

streaming cryptosystem

b)

block cryptosystem

c)

RSA

d)

El Gamal

e)

combined

30.

Euler function value φ(12)

a)

4

b)

7

c)

12

d)

10

e)

5

31.

Canonical polynomial decomposition f(x)= x2+4x^2 + 4 over the field of complex numbers

a)

(x-2)(x+2)

b)

x(x+4)

c)

(x-4)(x+4)

d)

(x+2i)(x-2i)

e)

(x+4i)(-4)

32.

Possible notation for the greatest common divisor of numbers m and n:

a)

НОК(m,n)

b)

НОД(m, n)

c)

(m , n)

d)

gcd (m, n)

e)

lcm(m,n)

33.

The least common multiple of m and n is denoted:

a)

НОК(m,n)

b)

НОД(m, n)

c)

(m , n)

d)

lcm(m,n)

e)

[m,n]

34.

Euler function value φ(n), if n=p*q, where p and q are prime numbers.

a)

φ(n)=p+q

b)

φ(n)=p-q

c)

φ(n)=p*q

d)

φ(n)= (p-1)q

e)

φ(n)= (p-1)(q-1)

35.

Euler function φ(35)

a)

20

b)

12

c)

2

d)

24

e)

28

36.

Euler function φ(29)

a)

27

b)

29

c)

30

d)

11

e)

28

37.

What class of transformations does the Caesar cipher belong to?

a)

simple replacement cipher

b)

substitution cipher

c)

permutation cipher

d)

tabular

e)

complex substitution cipher

38.

A lot of integers are denoted by the letter

a)

N

b)

P

c)

Q

d)

Z

e)

R

39.

Euler function of 7

a)

3

b)

6

c)

14

d)

5

e)

7

40.

Given n=23*19. What product gives the value of the Euler function?

a)

23*18

b)

22*19

c)

22*18

d)

23*20

e)

22*20

41.

Which of the numbers is coprime to 45?

a)

10

b)

25

c)

32

d)

15

e)

40

42.

What numbers give a remainder of 4 when divided by 9?

a)

A) 13 22 31 94 103

b)

B) 13 42 43 51 58

c)

C) 64 110 112 108 193

d)

D) 18 44 55 16 73

e)

E) 4 9 15 73 99

43.

Factoring of 99

a)

9*11

b)

3*3*11

c)

3*3*9*11

d)

3*9*11

e)

3∗1123*11^2

44.

What is the formula for multiples of 13?

a)

13n

b)

13+n

c)

13-n

d)

2n+13

e)

2n-13

45.

What is the formula for the numbers that give remainder 1 when divided by 5?

a)

5n+1

b)

5n-3

c)

5n+2

d)

5n+4

e)

5n

46.

A dictionary where elements of plain text (letters, combinations of letters, words, phrases) are replaced by groups of characters (letters, numbers, other signs) is

a)

code

b)

key

c)

wandering

d)

tenacity

e)

system

47.

The ability to resist the attempts of a cryptanalyst, well armed with modern technology and knowledge, to decrypt an intercepted text, reveal cipher keys or violate the integrity and authenticity of information

a)

open source

b)

cipher

c)

code

d)

tenacity

e)

decryption

48.

Attack on the cipher, disclosure of the cipher by the cracker

a)

coding

b)

decryption

c)

decrypt

d)

encryption

e)

decoding

49.

Plaintext is

a)

the original message to be protected by the cryptographer

b)

story

c)

internet offer

d)

article

e)

newspaper message

50.

Many reversible plaintext form transformations is

a)

cipher

b)

decryption

c)

closed text

d)

tenacity

e)

key

51.

A set of data defining a specific transformation from a set of cipher transformations

a)

code

b)

tenacity

c)

key

d)

cipher

e)

replacement

52.

Cryptography tasks

a)

ensuring privacy, user authentication

b)

ensuring the integrity of information

c)

ensuring non-traceability

d)

encryption

e)

decryption

53.

Confidentiality is handled by

a)

electronic signature

b)

protocols

c)

public keys

d)

private keys

e)

cryptosystems

54.

An illegal user is

a)

the one who seeks to seize information in order to turn it to his advantage and to the detriment of the legitimate user

b)

co-author

c)

random person

d)

buddy

e)

well-wisher

55.

The strength of the cryptosystem depends on

a)

the complexity of the transformation algorithm

b)

key length

c)

implementation method

d)

replacement cipher

e)

substitution cipher

56.

Public key systems use

a)

public and private key

b)

public key

c)

private key

d)

public, private and duplicate keys

e)

public key, private key, electronic signature and replaceable key

57.

Crypto resistance is

a)

A characteristic of a cipher that determines its resistance to decryption without knowing the key

b)

A characteristic of a cipher that determines its resistance to decryption, taking into account that the key is known

c)

Key characteristic

d)

Characteristics of the encryption algorithm

e)

PC specifications

58.

Crypto resistance indicators:

a)

the number of all possible keys; average time required for cryptanalysis

b)

the number of all possible keys;

c)

alphabet length

d)

average time required for cryptanalysis

e)

average time required for encryption

59.

The stage of development of cryptography and cryptanalysis before 1949 is

a)

pre-scientific cryptology

b)

scientific cryptology

c)

scientific cryptography

d)

Chenon's theory

e)

Markov theory

60.

Shannon considered a model in which a message source generates

a)

plaintext X

b)

closed text X

c)

key

d)

performs the operation X = T-1Y

e)

ciphertext Y

61.

In substitution encryption ("substitution") the characters of the encrypted text

a)

are replaced by characters of another or the same alphabet in accordance with the replacement scheme

b)

are rearranged according to some rule within some block of this text

c)

are transformed according to some analytical rules

d)

is transformed using a matrix

e)

is transformed using an inverse key matrix

62.

In permutation encryption, the characters of the encrypted text

a)

are replaced by characters of a different or the same alphabet in accordance with the replacement scheme

b)

are rearranged according to some rule within some block of this text

c)

are transformed according to some analytical rule

d)

is transformed using a matrix

e)

is transformed using an inverse key matrix

63.

By analytical transformation the characters of the encrypted text

a)

are replaced by characters of a different or the same alphabet in accordance with the replacement scheme

b)

are rearranged according to some rule within some block of this text

c)

are transformed according to some analytical rule

d)

is transformed using an inverse key matrix

e)

is transformed by permutation

64.

The types of substitution are considered in cryptography:

a)

mono-alphabetic, homophonic, polyalphabetic and poly-gram

b)

mono-alphabetic, homophonic, polyalphabetic

c)

Vizhner, Caesar, Playfer, analytical

d)

Huffman, Caesar, Playfair

e)

Huffman, Caesar, Playfair

65.

With mono-alphabetic replacement

a)

each letter of the plaintext alphabet is associated with one letter of the ciphertext from the same alphabet

b)

each letter of the plaintext alphabet is associated with two letters of the ciphertext from the same alphabet

c)

each letter of the plaintext is assigned a letter with a shift

d)

each letter of the plaintext alphabet is associated with one letter of the key

e)

each letter of the plaintext is assigned a letter of the sealed text

66.

The statistical properties of the plaintext are stored in the ciphertext

a)

The main disadvantage of mono-alphabetic replacement

b)

The main advantage of mono-alphabetic replacement

c)

The main disadvantage of Homophonic replacement

d)

The main advantage of Homophonic replacement

e)

The advantage of all encryption systems

67.

To distort the statistical properties of the ciphertext, use

a)

mono-alphabetic substitution

b)

Homophonic replacement

c)

Caesar cipher

d)

Playfair method

e)

Valapuk code

68.

Playfair cipher –

a)

polygram substitution

b)

mono-alphabet substitution

c)

multi-alphabetic replacement

d)

homophonic substitution

e)

polyalphabetic substitution

69.

Assigning to subjects and objects of access a unique number, cipher, code, etc. for the purpose of obtaining access to information is

a)

identification

b)

signature

c)

production code

d)

manufacturer code

e)

trademark

70.

Advantages of hardware implementation of cryptographic data closure

a)

high performance and simplicity

b)

encryption strength

c)

low material costs for implementation

d)

ease of creation

e)

reliability

71.

A guarantee that the source of the information is exactly the person who is declared as its author:

a)

Authenticity

b)

Appellability

c)

Confidentiality

d)

Integrity

e)

Reliability

72.

What is the correct answer?

a)

Authenticity

b)

Appellability

c)

Confidentiality

d)

Integrity

e)

Reliability

73.

A violation of the category of confidentiality of information is:

a)

Falsification of a message

b)

Theft or disclosure

c)

Computer system security threat

d)

Computer system vulnerability

e)

Falsification of the author of the post

74.

A violation of the category of information integrity is:

a)

Falsification of a message

b)

Theft or disclosure

c)

Computer system security threat

d)

Computer system vulnerability

e)

Falsification of the author of the post

75.

Cryptography means:

a)

Information coding

b)

Hiding the meaning of information

c)

Communication of information

d)

Safe storage of information

e)

New information

76.

Cryptography provides:

a)

Compressing data sizes

b)

Reliability of data storage

c)

Securing network protocols

d)

Protection of data processing programs

e)

Protection of information from unauthorized access

77.

The main purpose of cryptanalysis:

a)

Protecting network protocols

b)

Compressing data sizes

c)

Protection of information from unauthorized access

d)

Opposing cryptographic techniques

e)

Protection of data processing programs

78.

A complex science that includes cryptography and cryptanalysis:

a)

Cryptography

b)

Cryptology

c)

Cypherology

d)

Information protection

e)

Protectionology

79.

A cryptoalgorithm in the main classification scheme, when using which the sender and the receiver perform transformations on the message, known only to two of them:

a)

Cryptography with a key

b)

Stream cipher

c)

Symmetric cryptoalgorithm

d)

Asymmetric Cryptoalgorithm

e)

Cryptography

80.

What is the name of the cryptoalgorithm in the main classification scheme, the impact algorithm of which is known to all third parties, but it depends on some parameter (key) that only the sender and the receiver possess:

a)

Cryptography with a key

b)

Stream cipher

c)

Symmetric cryptoalgorithm

d)

Asymmetric Cryptoalgorithm

e)

Cryptography

81.

What is the name of the cryptoalgorithm in the main classification scheme, in which the same block of information (key) is used to encrypt and decrypt a message:

a)

Cryptography with a key

b)

Stream cipher

c)

Symmetric cryptoalgorithm

d)

Asymmetric Cryptoalgorithm

e)

Cryptography

82.

What is the name of the cryptoalgorithm in the main classification scheme, in which one key is used to encrypt the message, known to everyone, and to decrypt the message - another key that exists only with the recipient:

a)

Cryptography with a key

b)

Stream cipher

c)

Symmetric cryptoalgorithm

d)

Asymmetric Cryptoalgorithm

e)

Cryptography

83.

What groups are cryptoalgorithms divided into, depending on the nature of the impacts made on the data:

a)

Stream and block ciphers

b)

Scramblers and block ciphers

c)

Permutation and substitution algorithms

d)

Symmetric and asymmetric cryptoalgorithms

e)

Cryptography and Key Cryptography

84.

Prime factorization of 1000

a)

23∗532^3*5^3

b)

24∗522^4*5^2

c)

24∗52^4*5

d)

2∗3∗522*3*5^2

e)

7*2*3

85.

Canonical decomposition of number 144.

a)

2*12*12

b)

24*12

c)

2*2*3*3*3

d)

24∗322^4*3^2

e)

8*2*2*9

86.

Given number 125. Which of the numbers will be mutually prime with this number.

a)

25

b)

15

c)

33

d)

40

e)

75

87.

Cryptography means

a)

hiding information in order to ensure its confidentiality and integrity

b)

the process of converting open data into encrypted data using a cipher

c)

replaceable cipher element that is used to encrypt a specific message

d)

information hiding

e)

de-coding process

88.

Key -

a)

cipher element

b)

replaceable cipher element that is used to encrypt a specific message

c)

the process of converting open data into encrypted data using a cipher

d)

ciphertext element

e)

replaceable element

89.

Cryptanalysis -

a)

the science of coding techniques

b)

replaceable cipher element

c)

is used to encrypt a specific message

d)

the science of cipher breaking techniques and techniques

e)

entropy of information

90.

Cryptology -

a)

the science of methods and techniques for breaking ciphers

b)

a science consisting of two branches: cryptography and cryptanalysis

c)

cipher strength

d)

replaceable cipher element

e)

science (and practice of its application) about methods and methods of breaking ciphers (attack on ciphers)

91.

Mono and multi-alphabetic substitutions

a)

replacing characters of the original text with others from the other alphabet

b)

replacing characters of the original text with others of the same alphabet

c)

imposing on the source text some pseudo-random sequence generated based on the key

d)

represents a sequence (with possible repetition and alternation) of basic conversion methods applied to a block of ciphertext

e)

permutations

92.

Given a polynomial x2−16x^2 - 16 . Indicate a polynomial which is coprime to the given polynomial.

a)

(x−4)2(x-4)^2

b)

x2+16x^2 + 16

c)

(x+4)2(x+4)^2

d)

x-4

e)

x(x+4)

93.

Caesar cipher

a)

complex substitution cipher

b)

a simple replacement cipher

c)

permutation cipher

d)

substitution cipher

e)

RSA

94.

Substitutions, permutations, gamming, block ciphers refer to

a)

symmetric cryptosystems

b)

asymmetric cryptosystems

c)

El Gamal's algorithm

d)

RSA algorithm

e)

Diffie-Hellman algorithms

95.

As a key in encryption tables

a)

table size

b)

word

c)

a permutation phrase

d)

table feature

e)

table shape

96.

The key of the most primitive table permutation cipher is

a)

table size

b)

word

c)

phrase

d)

feature of table structure

e)

a set of numbers in a row length table

97.

Disguise is

a)

protecting the document from deletion

b)

physical barrier to access to protected information

c)

a method of protection in which users and personnel are forced to comply with the rules for the processing and storage of information under the threat of material, administrative or criminal liability

d)

a way to protect information by cryptographically closing it

e)

copy protection

98.

Methods an attacker can use to obtain a password

a)

decryption, password guessing and interception

b)

decryption, hacking and interception

c)

decryption, hacking, password guessing

d)

interception, cracking and password guessing

e)

decode, hack and intercept

99.

Into how many disjoint classes does the number m divide the set of all integers?

a)

m-1

b)

m+1

c)

m

d)

m+2

e)

2m

100.

Determine the reduced system of residues modulo 9

a)

0, 1, 2, 3, 4, 5, 6, 7, 8, 9

b)

1, 2, 3, 4, 5,

c)

7, 8, 9

d)

0, 1, 3, 5, 7, 9

e)

1, 2, 4, 5, 7, 8

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