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Audio Steganography Quiz

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Questions and Answers

What is the hiding rate measured in for audio steganography?

Mbps

Gbps

Kbps

Bps (correct)

How is imperceptibility of hidden information in audio steganography measured?

By measuring the signal-to-noise ratio (SNR)

By analyzing the frequency spectrum

Through perceptual evaluation of speech quality (PESQ) (correct)

By assessing the audio duration

What is the potential risk associated with amplification in audio steganography?

It could alter the hidden data (correct)

It enhances the hiding rate

It increases the imperceptibility

It improves the audio quality

What does re-quantization modify in audio steganography?

The original quantization of the audio signal Signup and view all the answers

What is the purpose of phase coding in audio steganography?

To hide information imperceptibly Signup and view all the answers

What is the formula for Discrete Cosine Transformation (DCT) to calculate the 64 brightness values?

$B(u, v) = \frac{1}{4}c(u)c(v)\sum_{x=0}^{7}\sum_{y=0}^{7}f(x, y)\cos\left[\frac{(2x + 1)u\pi}{16}\right]\cos\left[\frac{(2y + 1)v\pi}{16}\right]$ Signup and view all the answers

What is the number of nonzero JPEG coefficients obtained from the 64 brightness values using Discrete Cosine Transformation (DCT)?

8 Signup and view all the answers

In the context of JPEG coefficient embedding, what is the range of values to which a bit can be embedded?

$-4$ to $4$ Signup and view all the answers

What is the frequency of occurrence for the JPEG coefficient in the carrier medium with steganographic value $1$?

20.00% Signup and view all the answers

What is the frequency of occurrence for the JPEG coefficient in the steganogram with steganographic value $-2$?

7.50% Signup and view all the answers