CISSP Cryptography Practice Test

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  • 1/17 Questions

    Asymmetric key cryptography is used for all of the following except:

    • Encryption of data
    • Access control
    • Nonrepudiation
    • Steganography
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About This Quiz

Are you looking for some good practice test questions and answers on CISSP cryptography? Then, you've arrived at the right place. In this test, we will be asking you questions related to cryptography and its related concepts. You have to choose the correct option for every given question. Do you think you can pass this test? Let's start the quiz See moreand see how well you score. So, are you ready? Let's get started then.

CISSP Cryptography Practice Test - Quiz

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  • 2. 

    The most common forms of asymmetric key cryptography include

    • Diffie–Hellman

    • Rijndael

    • Blowfish

    • SHA-256

    Correct Answer
    A. Diffie–Hellman
    Explanation
    Diffie-Hellman is a widely used asymmetric key cryptography algorithm. It allows two parties to securely exchange cryptographic keys over an insecure channel. The algorithm is based on the mathematical problem of calculating discrete logarithms in a finite field. Diffie-Hellman provides a way for two parties to generate a shared secret key without actually transmitting it, making it resistant to eavesdropping attacks. It is commonly used in secure communication protocols such as SSL/TLS to establish secure connections between clients and servers.

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  • 3. 

    What is an important disadvantage of using a public key algorithm compared to a symmetric algorithm?

    • A symmetric algorithm provides better access control.

    • A symmetric algorithm is a faster process.

    • A symmetric algorithm provides nonrepudiation of delivery.

    • A symmetric algorithm is more difficult to implement.

    Correct Answer
    A. A symmetric algorithm is a faster process.
    Explanation
    Using a public key algorithm is slower compared to a symmetric algorithm. Public key algorithms involve complex mathematical calculations and require more computational resources, making them slower in processing data. On the other hand, symmetric algorithms use a single key for both encryption and decryption, resulting in faster processing times.

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  • 4. 

    When a user needs to provide message integrity, what options may be best?

    • Send a digital signature of the message to the recipient

    • Encrypt the message with a symmetric algorithm and send it

    • Encrypt the message with a private key so the recipient can decrypt with the corresponding public key

    • Create a checksum, append it to the message, encrypt the message, then send to recipient.

    Correct Answer
    A. Create a checksum, append it to the message, encrypt the message, then send to recipient.
  • 5. 

    A certificate authority provides what benefits to a user?

    • Protection of public keys of all users

    • History of symmetric keys

    • Proof of nonrepudiation of origin

    • Validation that a public key is associated with a particular user

    Correct Answer
    A. Validation that a public key is associated with a particular user
  • 6. 

    What is the output length of a RIPEMD-160 hash?

    • 160 bits

    • 150 bits

    • 128 bits

    • 104 bits

    Correct Answer
    A. 160 bits
  • 7. 

    ANSI X9.17 is concerned primarily with

    • Protection and secrecy of keys

    • Financial records and retention of encrypted data

    • Formalizing a key hierarchy

    • The lifespan of key-encrypting keys (KKMs)

    Correct Answer
    A. Protection and secrecy of keys
  • 8. 

    When a certificate is revoked, what is the proper procedure?

    • Setting new key expiry dates

    • Updating the certificate revocation list

    • Removal of the private key from all directories

    • Notification to all employees of revoked keys

    Correct Answer
    A. Updating the certificate revocation list
  • 9. 

    What is not true about link encryption?

    • Link encryption encrypts routing information.

    • Link encryption is often used for Frame Relay or satellite links.

    • Link encryption is suitable for high-risk environments.

    • Link encryption provides better traffic flow confidentiality.

    Correct Answer
    A. Link encryption is suitable for high-risk environments.
    Explanation
     

     

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  • 10. 

    A_________ is the sequence that controls the operation of the cryptographic algorithm.

    • Encoder

    • Decoder wheel

    • Cryptovariable

    • Cryptographic routine

    Correct Answer
    A. Cryptovariable
  • 11. 

    The process used in most block ciphers to increase their strength is

    • Diffusion

    • Confusion

    • Step function

    • SP-network

    Correct Answer
    A. SP-network
  • 12. 

    The two methods of encrypting data are

    • Substitution and transposition

    • Block and stream

    • Symmetric and asymmetric

    • DES and AES

    Correct Answer
    A. Symmetric and asymmetric
  • 13. 

    Cryptography supports all of the core principles of information security except

    • Availability

    • Confidentiality

    • Integrity

    • Authenticity

    Correct Answer
    A. Authenticity
    Explanation
    Cryptography supports the core principles of information security, including availability, confidentiality, integrity, and authenticity. Availability ensures that information is accessible to authorized users when needed, while confidentiality ensures that information is protected from unauthorized access. Integrity ensures that information remains unaltered and accurate, while authenticity ensures that the source of the information can be verified. Therefore, the correct answer is authenticity.

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  • 14. 

    A way to defeat frequency analysis as a method to determine the key is to use

    • Substitution ciphers

    • Transposition ciphers

    • Polyalphabetic ciphers

    • Inversion ciphers

    Correct Answer
    A. Polyalphabetic ciphers
    Explanation
    Polyalphabetic ciphers use multiple alphabets or keys to encrypt the plaintext, making it more difficult for frequency analysis to determine the key. Unlike substitution ciphers, where each letter is replaced with a fixed substitution, polyalphabetic ciphers use different substitutions based on the position of the letter in the plaintext. This adds complexity and randomness to the encryption, making it harder to detect patterns and break the cipher using frequency analysis.

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  • 15. 

    Th e running key cipher is based on

    • Modular arithmetic

    • XOR mathematics

    • Factoring

    • Exponentiation

    Correct Answer
    A. Modular arithmetic
    Explanation
    The running key cipher is based on modular arithmetic because it involves performing calculations within a finite set of numbers. In this encryption method, each letter of the plaintext is shifted by a corresponding letter from the running key, which is a repeating sequence of characters. The shift is determined by the position of the letters in the alphabet, and if the shift exceeds the number of letters in the alphabet, it wraps around using modular arithmetic. This ensures that the resulting ciphertext remains within the range of the alphabet.

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  • 16. 

    The only cipher system said to be unbreakable by brute force is

    • AES

    • DES

    • One-time pad

    • Triple DES

    Correct Answer
    A. One-time pad
    Explanation
    The one-time pad is considered unbreakable by brute force because it uses a random key that is as long as the message itself. This key is never reused and is kept completely secret. Each character of the message is encrypted by combining it with the corresponding character of the key using a simple mathematical operation. Since the key is random and used only once, it provides perfect secrecy and makes it impossible for an attacker to determine the original message without knowing the key. In contrast, other cipher systems like AES, DES, and Triple DES can potentially be broken through brute force attacks or other cryptographic attacks.

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  • 17. 

    Messages protected by steganography can be transmitted to

    • Picture files

    • Music files

    • Video files

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Steganography is the practice of hiding messages within other files to ensure secrecy. It involves embedding the message within the data of another file, such as a picture, music, or video file. This allows the message to be transmitted without arousing suspicion. Therefore, all of the above options are correct as they can be used to transmit messages protected by steganography.

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  • Current Version
  • May 01, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 21, 2012
    Quiz Created by
    Cindymurray

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