икт 8

The conversion process in which the source text is replaced with ciphertext is…

• encryption

• decryption

• decoding

• coding

• authorization

What is the basis of the anti-virus program?

• Waiting for the start of a virus attack.

• Backup of all files .

• Constant check of removable data carriers.

• Deleting the infected files .

• Comparison of program codes with codes of known viruses.

Polymorphic Virus  …

• changes the contents of files and disk sectors.

• substitutes instead of itself the non-infected sections of information.

• encrypts and changes their coding so they are harder to detect.

• can be quite easily detected and destroyed

• it is activated when a certain trigger condition occurs.

The word  is encoded  using a substitution method and  looks  like  “946150556175”.

• ONLINE

• SECRET

• CRYPTO

• CIPHER

• HACKER

  
  

What is a computer virus?*

• A program that can self-replicate and attach itself to various objects or resources of computer systems, networks without user knowledge.

• A program that contains promotional information and opens without user request.

• A program that runs itself when you turn on your computer.

• A code that prevents external devices from connecting to your computer.

• A special microchip, which determines the correct operation of the computer.

A method of protecting information based to transform messages in ways that are hard to decipher.

• Cryptography

• Cryptology

• Cryptanalysis

• Authorization

• Authentication

The cipher where some pseudo-random sequence generated from the key is superimposed on the source text.  

• transposition

• open

• gamming

• block

• substitution

Network viruses use for their spread

• Pirate discs.

  
  

• Protocols or commands of computer networks and e-mail.

  
  

• Disks with licensed software.

• Only local networks.

• USB flash drives

A computer virus that actively attacks an anti-virus program or programs in an effort to prevent detection.

• Boot Sector Virus.

• Worm Virus.

• Retrovirus.

• Trojan Virus.

• Polymorphic Virus.

A cipher that basically consists of the replacement every plaintext character for a different ciphertext character is called...

• open

• transposition

• gamming

• block

• substitution