A legal document management system must ensure that a contract's content has not been altered and that the signer cannot later deny having signed it. Which combination of cryptographic mechanisms achieves both integrity and non-repudiation?

Use a symmetric key to encrypt the contract and share the key with all parties.

Hash the contract and sign the hash with the signer's private key.

Encrypt the contract with the signer's public key and store the hash in a database.

Compute a checksum and append it to the contract.

Which mitigation is most effective against brute force attacks on cryptographic keys?

Encrypting the key with another key

Using a faster encryption algorithm

A company uses a cloud-based key management service (KMS) to store encryption keys. They want to ensure that even if the KMS is compromised, the keys remain protected. Which practice is most effective?

Store the keys on a developer's local machine.

Encrypt the keys with a master key stored in the same KMS.

Store the keys in a database with strong access controls.

Use a hardware security module (HSM) to store the keys, with the KMS acting as a front-end.

EC-CouncilBlockchain Developer Certification

Domain 2Objective 1

Cryptographic Principles BDC Practice Questions (Page 6)

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

37questions here

8free pages

6concepts

Questions 26–30

26foundation · easy
Which cryptographic attack involves an attacker intercepting and potentially altering communications between two parties without their knowledge?
Select an answer first
27application · medium
A legal document management system must ensure that a contract's content has not been altered and that the signer cannot later deny having signed it. Which combination of cryptographic mechanisms achieves both integrity and non-repudiation?
Select an answer first
28foundation · easy
Which cryptographic principle ensures that data cannot be read by unauthorized parties?
Select an answer first
29foundation · easy
Which mitigation is most effective against brute force attacks on cryptographic keys?
Select an answer first
30application · medium
A company uses a cloud-based key management service (KMS) to store encryption keys. They want to ensure that even if the KMS is compromised, the keys remain protected. Which practice is most effective?
Select an answer first

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Cryptographic Principles BDC Practice Questions (Page 6)

Questions 26–30

Which cryptographic attack involves an attacker intercepting and potentially altering communications between two parties without their knowledge?

A legal document management system must ensure that a contract's content has not been altered and that the signer cannot later deny having signed it. Which combination of cryptographic mechanisms achieves both integrity and non-repudiation?

Which cryptographic principle ensures that data cannot be read by unauthorized parties?

Which mitigation is most effective against brute force attacks on cryptographic keys?

A company uses a cloud-based key management service (KMS) to store encryption keys. They want to ensure that even if the KMS is compromised, the keys remain protected. Which practice is most effective?

Keep studying — Cryptography and Security Foundations