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BCA Cyber Security Cryptography — practice questions

Explore 26 free Cryptography questions in BCA Cyber Security Cybersecurity. Open each question or exercise to read its content, reference answers and available explanation.

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Cryptography questions and exercises with answers

Showing questions 1–26 of 26.

Data that has not been encrypted is called:Read the answer and worked solution →The service that keeps sensitive information from unauthorised entities is:Read the answer and worked solution →A confidentiality service is provided by which cryptographic process?Read the answer and worked solution →The result of applying a hash function is also called a message:Read the answer and worked solution →A public key together with its corresponding private key is called a:Read the answer and worked solution →Turning ciphertext back into plaintext with an algorithm and key is:Read the answer and worked solution →A cryptographic hash function maps a bit string of arbitrary length to one of:Read the answer and worked solution →A message authentication code is described as a cryptographic:Read the answer and worked solution →A MAC uses which kind of key?Read the answer and worked solution →A MAC detects modifications that are intentional and also:Read the answer and worked solution →Providing assurance of the identity of an entity interacting with a system is:Read the answer and worked solution →Providing assurance of where information came from is:Read the answer and worked solution →Which service supports proving to a third party who signed a message?Read the answer and worked solution →Signature generation uses a digital signature algorithm together with a:Read the answer and worked solution →Signature verification uses the digital signature together with a:Read the answer and worked solution →A block cipher algorithm maps bit strings of a fixed length to strings of:Read the answer and worked solution →An algorithm using a block cipher as a primitive to provide a service is a:Read the answer and worked solution →A random bit generator outputs bits that appear statistically independent and:Read the answer and worked solution →Which key does it useRead the answer and worked solution →Match the cryptographic termRead the answer and worked solution →Order signing and verifyingRead the answer and worked solution →Which security serviceRead the answer and worked solution →True or false about cryptographyRead the answer and worked solution →Complete the cryptography factsRead the answer and worked solution →Spot the false claimRead the answer and worked solution →Cryptography bingoRead the answer and worked solution →

Worked practice questions

Data that has not been encrypted is called:

  1. Plaintext
  2. Plainlist
  3. Plaintint
  4. Plaintone
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Correct answer: A. Plaintext

1. Encryption turns readable data into something unreadable. 2. The readable form needs a name of its own. 3. Plaintext is data that has not been encrypted. 4. It is intelligible without applying decryption. _Source: NIST SP 800-175B Rev. 1, 'Guideline for Using Cryptographic Standards in the Federal Government'_

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The service that keeps sensitive information from unauthorised entities is:

  1. Configurability
  2. Confidentiality
  3. Compatibility
  4. Connectivity
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Correct answer: B. Confidentiality

1. Security services are named for the property they protect. 2. One protects against disclosure. 3. Confidentiality is the property whereby sensitive information is not disclosed to unauthorized entities. 4. So the answer is confidentiality. _Source: NIST SP 800-175B Rev. 1, 'Guideline for Using Cryptographic Standards in the Federal Government'_

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A confidentiality service is provided by which cryptographic process?

  1. Encryption
  2. Extraction
  3. Estimation
  4. Enumeration
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Correct answer: A. Encryption

1. Confidentiality is a goal, not a mechanism. 2. One process actually delivers it. 3. A confidentiality service can be provided by a cryptographic process called encryption. 4. So the answer is encryption. _Source: NIST SP 800-175B Rev. 1, 'Guideline for Using Cryptographic Standards in the Federal Government'_

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