Mathematical methods of protection answers to the Syner

Answers to tests Mathematical methods of information security Synergy. Result 87

1.Phoneme is ...
elementary symbol
consonant component of language
vowel component of language
elementary sound of the tongue

2.The imitation insert is designed to test ...
message content
message privacy
message integrity
message availability

3.The secret sharing method is used primarily to reduce risks ...
integrity of information
procedures for receiving information
decision-making procedures
communication procedures

4.In an asymmetric encryption system for independent operation of N subscribers ...
2N keys
N * N keys
N (N-1)
N! keys

5.In an asymmetric RSA cryptosystem ...
the public key is generated by the recipient and the private key is generated by the sender
public and private keys are generated by the recipient
the private key is generated by the recipient and the public key is generated by the sender
public and private keys are generated by the sender

6.For initial key distribution ...
any communication channel is required
a secure communication channel is required
communication channel is optional
it is not necessary to have a secure communication channel

7. It is not true that the disadvantages of symmetric encryption systems include ...
communication channel requirements
key generation service requirements
cryptographic strength of cipher
key distribution requirements

8.Transmission of a symmetric key over unprotected channels in an open form ...
allowed
not allowed
allowed, depending on the circumstances
allowed in parts

9.The length of the ciphertext must be ...
multiple of the length of the source text
longer source text
shorter length of the original text
equal to the length of the original text

10 Substitution of an encrypted message involves ...
duplicate message
message delay
destroying a message
message modification

11.In a symmetric system, the recipient and sender use to encrypt and decrypt the message ...
the same key
two different keys
more than two keys
don´t use keys

12. The average duration of a fricative sound is ...
5-10 ms
10-20 ms
20-50 ms
50-80 ms

13. The average duration of an explosive sound is ...
no more than 5 msec
from 5 to 10 ms
from 10 to 15 ms
15 to 20 ms

14. The disadvantage of asymmetric encryption systems is ...
the number of keys required to work on the network
the need for secure channels for key exchange
speed of work
key distribution procedure

15 Diffie-Hellman security is based on complexity ...
solutions of equations of elliptic curves
factorization problems
discrete logarithm problems
potentiation tasks

16. The maximum number of rounds of encryption according to the GOST 28147-89 standard is ...
eighteen
24
32
48

17. It is not true that the disadvantages of asymmetric cryptosystems include ...
the ability to change the key
the need for secure channels for key exchange
lack of mathematical proof of irreversibility of functions used in asymmetric algorithms
speed of work

18 Practical Implementation of the Diffie-Hellman Algorithm ...
does not rule out emulation of messages
eliminates imitation of messages
provides for mandatory imitation of messages
increases the likelihood of spoofing messages

19. The adversary, making a substitution or imitation of a message, proceeds from the assumption that ...
the new cryptogram will be perceived as meaningful text in the old key
the new cryptogram will be perceived as meaningful text in a new key
the new cryptogram will be perceived as meaningful text on the current key
the new cryptogram will be perceived as meaningful text on the reserve key

20. The reliability of the RSA algorithm is based on ...
on the complexity of finding pairs of coprime numbers
on the difficulty of factorizing large numbers and the complexity of computing discrete logarithms in a finite field
on the difficulty of finding the coordinates of a point