What is the principle behind echo hiding in audio steganography?

Adding a short echo to the audio signal to encode data

Hiding data in the file's metadata

Replacing the least significant bits of audio samples

Spreading the hidden data across a wide frequency range

How can data be hidden in network protocols?

By using unused fields in TCP/IP headers

By encrypting the entire payload

By changing the IP address of the sender

By compressing the data before transmission

A security analyst is investigating a suspicious WAV audio file that was found on a compromised server. The file plays normally, but the analyst notices that the file size is larger than expected for the duration and quality. The analyst suspects that data may be hidden in the audio. Which technique would most likely be used to hide data in this audio file?

Whitespace manipulation in text

What is the primary purpose of steganography as opposed to cryptography?

To encrypt data so that it cannot be read without a key

To verify the integrity of data using hash functions

To conceal the existence of a message within another medium

To compress data to reduce its size for transmission

A forensic examiner receives a JPEG image that is suspected of containing hidden data. The image's file size is unusually large for its resolution, and the examiner wants to detect whether LSB steganography was used. Which approach should the examiner take first?

Open the image in a hex editor and search for the string 'hidden'.

Run a statistical analysis tool such as Stegdetect on the image.

Compare the image's hash to the original file's hash from a known database.

Convert the image to PNG and re-save it to see if the file size changes.

EC-CouncilDigital Forensics Essentials

Domain 3Objective 3

Steganography and Data Hiding Techniques DFE Practice Questions (Page 7)

Part of the Defeating Anti-Forensics Techniques domain, which makes up ~13% of our current practice bank.

50questions here

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9concepts

Questions 31–35

31foundation · easy
What is the principle behind echo hiding in audio steganography?
Select an answer first
32foundation · easy
How can data be hidden in network protocols?
Select an answer first
33application · medium
A security analyst is investigating a suspicious WAV audio file that was found on a compromised server. The file plays normally, but the analyst notices that the file size is larger than expected for the duration and quality. The analyst suspects that data may be hidden in the audio. Which technique would most likely be used to hide data in this audio file?
Select an answer first
34foundation · easy
What is the primary purpose of steganography as opposed to cryptography?
Select an answer first
35application · medium
A forensic examiner receives a JPEG image that is suspected of containing hidden data. The image's file size is unusually large for its resolution, and the examiner wants to detect whether LSB steganography was used. Which approach should the examiner take first?
Select an answer first

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