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?

<p>The original quantization of the audio signal (A)</p> Signup and view all the answers

What is the purpose of phase coding in audio steganography?

<p>To hide information imperceptibly (D)</p> Signup and view all the answers

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

<p>$B(u, v) = \frac{1}{4}c(u)c(v)\sum_{x=0}^{7}\sum_{y=0}^{7}f(x, y)\cos\left[\frac{(2x + 1)u\pi}{16}\right]\cos\left[\frac{(2y + 1)v\pi}{16}\right]$ (A)</p> 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)?

<p>8 (B)</p> 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?

<p>$-4$ to $4$ (B)</p> Signup and view all the answers

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

<p>20.00% (D)</p> Signup and view all the answers

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

<p>7.50% (D)</p> Signup and view all the answers

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