A defense contractor must send a large classified file to a partner organization. The file is 10 GB, and the partner's public key is available. The contractor's security policy requires that the file be encrypted with a key that is destroyed after transmission, and that the key be protected during transit. Which approach best meets these requirements?

Encrypt the file directly with the partner's public key.

Encrypt the file with a symmetric key and send the key in a separate email.

Use a shared symmetric key that is reused for all transmissions.

Generate a one-time symmetric key, encrypt the file with it, encrypt the symmetric key with the partner's public key, and send both.

A company wants to protect sensitive data on employees' laptops in case the devices are lost or stolen. The data is stored on the local hard drive. Which encryption application is most appropriate?

Digital signatures on all files

TLS for all network connections

Full-disk encryption (FDE) such as BitLocker or FileVault

A network engineer is configuring a VPN for a remote site that connects over a low-latency satellite link. The data is a continuous stream of small control packets. The engineer wants to minimize latency and avoid padding overhead. Which type of cipher is most appropriate for this traffic?

A stream cipher such as ChaCha20

A block cipher in CBC mode with PKCS#7 padding

EC-CouncilNetwork Defense Essentials

Domain 6Objective 3

Data Encryption Techniques NDE Practice Questions (Page 9)

Part of the Cryptography, PKI, and Data Security domain, which makes up ~15% of our current practice bank.

44questions here

9free pages

7concepts

Questions 41–44

41foundation · easy
Which technology uses encryption to secure data transmitted over a public network?
Select an answer first
42expert · hard
A defense contractor must send a large classified file to a partner organization. The file is 10 GB, and the partner's public key is available. The contractor's security policy requires that the file be encrypted with a key that is destroyed after transmission, and that the key be protected during transit. Which approach best meets these requirements?
Select an answer first
43application · easy
A company wants to protect sensitive data on employees' laptops in case the devices are lost or stolen. The data is stored on the local hard drive. Which encryption application is most appropriate?
Select an answer first
44application · medium
A network engineer is configuring a VPN for a remote site that connects over a low-latency satellite link. The data is a continuous stream of small control packets. The engineer wants to minimize latency and avoid padding overhead. Which type of cipher is most appropriate for this traffic?
Select an answer first

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Data Encryption Techniques NDE Practice Questions (Page 9)

Questions 41–44

Which technology uses encryption to secure data transmitted over a public network?

A company wants to protect sensitive data on employees' laptops in case the devices are lost or stolen. The data is stored on the local hard drive. Which encryption application is most appropriate?

A network engineer is configuring a VPN for a remote site that connects over a low-latency satellite link. The data is a continuous stream of small control packets. The engineer wants to minimize latency and avoid padding overhead. Which type of cipher is most appropriate for this traffic?

Keep studying — Cryptography, PKI, and Data Security