A company's security policy requires that symmetric keys be rotated every 90 days. What is the primary reason for this policy?

To avoid using the same algorithm

To comply with export regulations

To reduce the amount of data encrypted with a single key

A security engineer is designing a key management system for a large enterprise. They need to support key rotation for a symmetric key used to encrypt data in a database. The system must allow old data to be decrypted after the key is rotated. What is the best approach?

Re-encrypt all data with the new key immediately after rotation.

Delete the old key after rotation to ensure security.

Use the same key for encryption and decryption to avoid the need for rotation.

Keep the old key in a key store and use it only for decryption of data encrypted with it.

What is the primary purpose of key rotation in a symmetric encryption system?

To limit the amount of data encrypted with a single key.

To ensure that the key is stored in a hardware security module.

To increase the speed of encryption operations.

EC-CouncilBlockchain Developer Certification

Domain 2Objective 2

Symmetric Cryptography and Key Algorithms BDC Practice Questions (Page 3)

Part of the Cryptography and Security Foundations domain, which makes up ~10% of our current practice bank.

40questions here

8free pages

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Questions 11–15

11application · medium
A company's security policy requires that symmetric keys be rotated every 90 days. What is the primary reason for this policy?
Select an answer first
12expert · hard
A security engineer is designing a key management system for a large enterprise. They need to support key rotation for a symmetric key used to encrypt data in a database. The system must allow old data to be decrypted after the key is rotated. What is the best approach?
Select an answer first
13foundation · easy
Which symmetric algorithm is a stream cipher that is often used in software implementations due to its high performance on devices without hardware acceleration?
Select an answer first
14foundation · easy
What is the primary purpose of key rotation in a symmetric encryption system?
Select an answer first
15foundation · easy
Which block cipher mode of operation provides both confidentiality and authentication, making it a common choice for secure network protocols?
Select an answer first

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Symmetric Cryptography and Key Algorithms BDC Practice Questions (Page 3)

Questions 11–15

A company's security policy requires that symmetric keys be rotated every 90 days. What is the primary reason for this policy?

A security engineer is designing a key management system for a large enterprise. They need to support key rotation for a symmetric key used to encrypt data in a database. The system must allow old data to be decrypted after the key is rotated. What is the best approach?

Which symmetric algorithm is a stream cipher that is often used in software implementations due to its high performance on devices without hardware acceleration?

What is the primary purpose of key rotation in a symmetric encryption system?

Which block cipher mode of operation provides both confidentiality and authentication, making it a common choice for secure network protocols?

Keep studying — Cryptography and Security Foundations