53. Which conclusion is wrong

d. The Merkle - Hellman code system is widely used in digital signatures

a. The RSA code system is widely used in the Internet

b. ECC ciphers are applied in the lock agreement model

c. The Merkle-Hellman code system is not widely used in the Internet

54. Compared to the block cipher system, what are the characteristics of the public key cipher system?

b. Publicly encrypted algorithms, so they are not secure

c. Small lock space is easy to spy on code

d. There is a public key, so the content of the message is easily decrypted

55. Which conclusion is correct

b. ECC cryptography is applied in digital signatures

a. The Merkle - Hellman code system is widely used in digital signatures

c. The Elgamal code system is widely applied in the Internet

d. The Merkle - Hellman code system is widely applied in the Internet

56. Which conclusion is correct

b. The PKC cipher system allows the key encryption of the SKC cipher system

a. PKC has the same encryption and decryption algorithms

c. PKC stands for Private key cryptography

d. The speed of encryption and decryption in the PKC code system is equivalent

57. Which conclusion is correct

d. The Merkle-Hellman code system is less secure than RSA

a. The Merkle-Hellman code system has a super-tank key as a public key

b. The Merkle-Hellman code system has a door contained in the public key

c. Highly secure Merkle - Hellman code system

58. Digital signatures are understood as

a. An inspection in which multiple people can search but only one person is created with a signature

b. A test in which 1 person can code and only 1 person can test

c. A test in which only those who know the secret key can check it

59. To sign a large digital content, we usually do

b. Sign on behalf of digital content

a. Sign on important parts of digital content

c. Sign at the end of the document

60. RSA digital signatures are similar to the RSA encryption system in several points

b. Use of secret and public keys

a. Using secret and public keys, the secret key is used for encryption, and the public key is used for decryption

c. Use the secret and public keys in the same order of execution

d. Use the same encryption and decryption algorithms

61. RSA digital signatures differ from the RSA encryption system in several points

b. Use the same key pair, but the order in which the key is used is reversed

a. Use completely different secret and public keys

c. In digital signatures, the role of secret and public keys is unclear

d. Use secret and public keys, but 2 keys are defined completely differently

62. Indicate the hash function characteristics

b. Create a constant-length output value

c. With the same input value will obtain different output values

63. Which conclusion is true for hash functions

d. A hash function has the same number of outputs as the number of inputs

a. A hash function is conventional, a secret key and can be changed by the user

b. A hash function is conventional, a secret key and cannot be changed by the user

c. The hash value is a representation of the input

68. Basis of DSA standard digital signature algorithm

b. Elgamal Digital Signature Algorithm

a. ECC Digital Signature Algorithm

c. RSA Digital Signature Algorithm

d. Merkle-Hellman Digital Signature Algorithm

69. Which conclusion is true for hash functions

c. The hash function is used to create user accounts on the network

a. The non-collision of MD-5 is equivalent to that of SHA-1

b. Non-collision of MD-5 compared to SHA-1

d. Hash functions are only applied in digital signatures

70. Blom Key Delivery System Implements

a. Distribute a private function, users build their own shared keys by combining private functions with public keys

b. Distribute each secret key pair to each user in the system

c. Distribute a public key to the entire group of users

d. Distribute each user's secret and public key, the public key is shared with the whole team

71. Time Stamp in Kerberos Protocol Eliminates Code Snooping Case

d. Using old keys and spoofing identities

73. The Diffile-Hellman key-generating session key-based protocol

b. Elliptic curve-based cryptography

74. Key distribution protocol is understood as

d. There is a key distribution center that participates in creating and sending keys

a. Have a key distribution center

75. Key Agreement Protocol

b. The two sides manage and exchange keys

a. There is a third party involved in creating and sending difficulties to both parties

d. There is a third center involved in creating and sending difficulties to both parties

77. Passive forms of attack

b. The 3rd subject eavesdrops on transactions, collects information about transactions

a. The 3rd subject eavesdrops on transactions, detects characteristics and uses fake transactions to make a profit

c. The 3rd subject eavesdrops on the transactions, learns the rules and then participates in modifying the transaction

d. The 3rd object eavesdrops on transactions, when detecting loopholes, will take advantage of the transaction session attack

78. Self-Arbitration Protocol Understood

c. The parties supervise each other, when they see signs of violating the transaction process, they will be stopped for verification

a. The arbitrator supervises the transactions, if it sees signs of violation, it will notify the relevant parties to modify the process by themselves

b. Transaction parties have sufficient authority to deal with protocol violators

d. The parties agree on the transaction in each step, after agreeing on 1 step, then move on to the next step

79. Interpreted Historian Protocols

b. The trading rules are built in advance, intermediaries are only used when a dispute arises

a. An arbitrator oversees the entire transaction process and arbitrates when a dispute arises

c. When a dispute arises, one party invites an intermediary to come in to confirm the entire transaction process

d. The arbitrator supervises all transaction processes, when a violation occurs, the arbitrator will invite a competent intermediary to stand up and settle all violations

80. The form of active attack is understood

c. The third subject eavesdrops on transactions, learns the rules, and then interferes in trading sessions

a. The 3rd subject eavesdrops on transactions, when detecting loopholes, will take advantage of changing the content of that trading session

b. The 3rd subject eavesdrops on transactions, collects information about transactions

d. The 3rd subject eavesdrops on transactions, profiting from grasping transaction information

82. Fast Exponential Algorithm Applied to

c. Public key system and digital signatures

84. Which conclusion is correct for X.509?

d. Public Key Certificate Standards

a. Standard public key certificates, encryption standards and digital signature standards

46-90

Authored by Phuong Do

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45 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

46. Which conclusion is true for the encryption system on the Elliptic curve

a. The length of the code is equal to the length of the explicit text

b. Combine the above answers

c. Smaller lock length than RSA but secure

d. Computational Algorithms with Power Operations

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

47. In a combined system of RSA and AES, the function of the encryption systems is

a. RSA Encrypt Messages, RSA Encrypt RSA Keys

b. AES 1st Encryption Message, 2nd RSA Encryption for Enhanced Security

c. RSA 1st Encrypt Messages, AES 2nd Encryption for Enhanced Security

d. AES Message Encryption, RSA AES Key Encryption

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

48. Which conclusion is correct

a. The Merkle - Hellman code system has a small lock

b. The Merkle - Hellman code system has a trap door that is a super tank lock

c. The Merkle-Hellman code system has a trap door that is a public key

d. The Merkle-Hellman code system does not calculate inverse numbers

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

49. The Merkle-Hellman code system does not calculate inverse numbers

a. The ECC encryption system has a smaller key length than RSA

b. The Elgamal encryption system always has the phenomenon of duplicate ciphers

c. The RSA encryption system always exists in the phenomenon of duplicate ciphers

d. The Merkle-Hellman encryption system has a key length of 1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

50. Which conclusion is wrong

a. The Elgamal encryption system for ciphers that are larger than the spec

b. Elgamal encryption system for ciphers that are twice the size of the spec

c. The Elgamal coding system is based on the difficulty of discrete logarithm problems

d. Elgamal encryption system is widely used

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

51. Which conclusion is wrong

a. The Merkle - Hellman code system is based on the difficulty of the problem of placing objects in the box

b. The Merkle-Hellman code system is not widely used

c. The Merkle-Hellman code system has a small key length

d. The Merkle-Hellman code system has low safety

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

52. Which conclusion is wrong with the ECC key system

a. ECC with lock is the point on the Elliptic curve

b. ECC performs calculations with points on the Elliptic curve

c. ECC has a smaller key size than RSA

d. ECC is easy to deploy and install

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