Security+ Cryptography Quiz

Which of the following illustrate the security through obscurity concept?

Choose all that apply.

• Code obfuscation

• Steganography

• SSID broadcast suppression

• Encryption

• Substitution ciphers

Which of the following refers to a solution designed to strengthen the security if session keys?

• ECB

• PFS

• EFS

• PFX

In cryptography, the term "key stretching" refers to a mechanism for extending the length of a cryptographic key to make it more secure against brute-force attacks.

• True

• False

Which of these three states of digital data requires data to be processed in an unencrypted form?

• Data-in-transit

• Data-at-rest

• Data-in-use

In cryptography, "secret algorithm" refers to an algorithm designed in a way that prevents the examination of its inner workings.

• True

• False

"Ephemeral key" refers to an asymmetric encryption key designed to be used only for the duration of a single session or transaction.

• True

• False

What are the characteristics of a session key?

Choose all that apply.

• Used during a single session

• Asymmetric key

• Reused during multiple sessions

• Symmetric key

The number of bits in a key used by a cryptographic algorithm is referred to as a key size or key length. The key size determines the maximum number of combinations required to break the encryption algorithm, therefore typically a longer key means stronger cryptographic security.

• True

• False

Unlike stream ciphers which process data by encrypting individual bits, block ciphers divide data into separate fragments and encrypt each fragment separately.

• True

• False

Which of the following is used in conjunction with the assumption that the output of a cryptographic function should be considerably different from the corresponding plaintext input?

• Confusion

• Obfuscation

• Collision

• Diffusion