Quiz  /  Cryptography Class 12 MCQ Questions With Answers

  • 1. 
    Key

  • algorithm for transforming plaintext to ciphertext
  • info used in cipher known only to sender/receiver
  • •recovering ciphertext from plaintext
  • •converting plaintext to ciphertext

  • 2. 
    Authentication

  • Ensure message remains secret during transmission between parties
  • Ensure message is not altered while in transit between communicating partners
  • Verifies sender is who she says she is
  • Proves that nobody but on sender could have sent a particular message

  • 3. 
    Cipher

  • •study of principles/methods of deciphering ciphertext without knowing key
  • •converting plaintext to ciphertext
  • •coded message
  • algorithm for transforming plaintext to ciphertext

  • 4. 
    Document containing only text

  • Ciphertext
  • Cipher
  • Plaintext
  • Algorithm

  • 5. 
    Shifting letters around to make text unreadable known as cryptographic algorithms is referred to as

  • Sifr
  • Cipher
  • Encryption
  • Plaintext

  • 6. 
    Decipher

  • original message
  • algorithm for transforming plaintext to ciphertext
  • recovering plaintext from ciphertext
  • •field of both cryptography and cryptanalysis

  • 7. 
    This is a mathematical procedure for performing encryption

  • Cipher
  • Algorithm
  • Substitution
  • Transposition

  • 8. 
    Encrypted text

  • Ciphertext
  • Plaintext
  • Algorithm
  • Cipher

  • 9. 
    This method of encryption is the replacement of an item with a different item.

  • Transposition
  • Confusion
  • Substitution
  • Diffusion

  • 10. 
    Confidentiality

  • Ensure message remains secret during transmission between parties
  • Ensure message is not altered while in transit between communicating partners
  • Verifies sender is who she says she is
  • Proves that nobody but on sender could have sent a particular message

  • 11. 
    This is as set of possible key values for an algorithm

  • Work Factor
  • Cipher
  • Keyspace
  • Keyfactor

  • 12. 
    Encipher

  • converting plaintext to ciphertext
  • coded message
  • •study of principles/methods of deciphering ciphertext without knowing key
  • study of encryption principles/methods

  • 13. 
    Cryptography is the science of encrypting or hiding information.

  • True
  • False

  • 14. 
    Integrity

  • Ensure message remains secret during transmission between parties
  • Ensure message is not altered while in transit between communicating partners
  • Verifies sender is who she says she is
  • Proves that nobody but on sender could have sent a particular message
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