ImSecu Kahoots

42 flashcards · Other · by Ivona

1. Which term describes the art and science of writing hidden messages? a. Cryptography b. Watermarking c. Steganography d. Encryption

   c. Steganography

2. What is the main benefit of LSB+ over LSB in Steganography? a. A Longer message can be hidden b. Preserves the cover histogram c. PSNR value is higher d. Embedded messages easier to retrieve

   b. Preserves the cover histogram

3. Which of the following properties concerning PRNU is wrong? a. It's very unlikely that 2 sensors have the same PRNU pattern b. PRNU survives corruptions like lossy compression c. PRNU is independent of camera settings, and scene content d. PRNU is visible even in very dark images

   d. PRNU is visible even in very dark images

4. Which is the countermeasure to steganography? a. Cryptography b. Steganalysis c. Digital Watermarking d. Deepfake

   b. Steganalysis

5. In order to compute accurately the PNRU pattern it is necessary to access many images (ex. N>50): a. True b. False

   a. True

6. A ? tool permits security professional or a hacker to embed hidden data within a carrier file like an image a. Cryptography b. Tomography c. Steganography

   c. Steganography

7. In Digital ImageForensics, acomposite is a. a fully computer generated image b. a forgery using several images c. a forgery based on copy-move techniques involving a single image d. a forgery based on inpainting techniques

   b. a forgery using several images

8. What is currently the least reliable biometric trait? a. Digital fingerprint b. Face c. Iris

   b. Face

9. Man on top is what number? a. 1 b. 5 c. 6 d. 10

   c. 6

10. On which website the first has deepfake been published? a. Facebook b. Twitter c. YouTube d. Reddit

    d. Reddit

11. Who created the first biometric system? a. An American citizen b. An Indian citizen c. A French citizen d. An English citizen

    c. A French citizien

12. In biometrics, people are recognized from … a. something they know (e.g. passwd) b. physical or physiological characteristic c. something they have (e.g. a key) d. witness

    b. physical or physiological characteristic

13. The Aadhaar Biometric program inIndia uses: a. iris - fingerprint - face b. face - iris c. iris - fingerprint d. fingerprint - face

    a. iris - fingerprint - face

14. Which one of the following minutia plays an important role in fingerprint recognition? a. Bifurcation b. Lake c. Island d. Bridge

    a. Bifurcation

15. In airports, most biometric systems are based on a. Gait b. Voice c. Fingerprint d. Brain activity

    c. Fingerprint

16. Identical twins have same a. Iris b. Fingerprint c. DNA

    c. DNA

17. To control access of very sensitive areas, it is important to minimize in priority: a. false reject b. time response c. false accept d. equipment cost

    c. false accept

18. An iris can be summarized in a code composed of about one thousand ? numbers. a. binary b. integer c. real d. complex

    a. binary

19. Which one of these 3 zones provides the best security: a. Zone #1 b. Zone #2 c. Zone #3

    a. Zone #1

20. The fusion of two biometric scores always yields better results with respect to the usage of only one of them: a. yes b. no

    b. no

21. In biometrics, EER (Equal Error Rate) is the point in which False Rejection Rate and False Acceptance Rate are equal: a. yes b. no

    a. yes

22. A high security system is a system with: a. High FRR and low FAR b. Low FRR and low FAR c. High FRR and high FAR d. Low FRR and high FAR

    a. High FRR and low FAR

23. What is the difference between identification and verification? a. Identifiction is 1:1 matching, verification is 1:N matching b. They are both 1:N matching c. Identifiction is 1:N matching, verification is 1:1 matching d. They are both 1:1 matching

    c. Identifiction is 1:N matching, verification is 1:1 matching

24. What is the correct definition of True Rejection in Biometric System Evaluation? a. Genuine individual is accepted b. Genuine Individual is rejected c. Imposter is accepted d. Impostor is rejected

    d. Impostor is rejected

25. Which of these advantages attached to 3D face recognition is NOT true w.r.t. 2D Face Reco.? a. Access to the depth information b. Pose conditions may be compensated c. Light conditions may be compensated d. Acquisition process is faster

    d. Acquisition process is faster

26. Which of these is NOT a property of facial thermograms? a. It cannot be altered by plastic surgery b. It is a very stable biometric trait over time c. The technology is based on infrared technology d. It does not depend on the temperature

    d. It does not depend on the temperature

27. Which of these global fingerprint patterns is the less common? a. Arch b. Left Loop c. Right Loop d. Whorl

    a. Arch

28. Which type of primary pattern of fingerprints is represented in this picture? a. Loop b. Whorl c. Arch d. Gulf

    c. Arch

29. In verification, fusion based on the AND operator will: a. Increase False Reject and increase False Accept b. Increase False Reject but decrease False Accept c. Decrease False Reject and decrease False Accept d. Decrease False Reject but increase False Accept

    b. Increase False Reject but decrease False Accept

30. What is NOT a characteristic attached to soft biometrics? a. Can be sensed from a distance b. Can be applied to perons whoa are not enrolled in the system c. Can be useful to prune person search d. Are relatively "expensive" to compute

    d. Are relatively "expensive" to compute

31. Which of the following biometrics is not recommended by the International Civil Aviation Organization (ICAO)? a. Fingerprint b. Voice c. Face d. Iris

    b. Voice

32. The Morphing Attack consists in mixing two different faces in order to be both recognized by an authentication system a. yes b. false

    a. yes

33. Assuming that a method of digital watermarking needs the original media to extract the payload. Such a method is then: a. out blind b. off blind c. pseudo blind d. non blind

    d. non blind

34. The JAWS algorithm for video watermarking has been proposed by: a. HITACHI b. NEC c. SONY d. PHILIPS

    d. PHILIPS

35. The Fourier-Mellin Transform is used in watermarking because of its ? invariance property. a. Rotation, Flip and Scale b. Rotation, Flip and Translation c. Rotation, Crop and Scale d. Rotation, Scale and Translation

    d. Rotation, Scale and Translation

36. To dewatermak a picture by collusion, the key operation consists in? a. Splitting the image into blocks to break the watermark signal b. Appling random small local changes to the image c. Averaging different protected copies of the picture d. Modifying the most significant bits

    c. Averaging different protected copies of the picture

37. Which one is NOT a type of attack in Digital Watermarking? a. Steganalysis attack b. Signal attack c. Cryptographic attack d. Protocol attack

    a. Steganalysis attack

38. When hiding the LSB of a checksum=7 by overwritting the LSB of a pixel=8, what would be the new value of the host pixel? a. 6 b. 7 c. 8 d. 9

    d. 9

39. Deadlock problem is related to a. Cryptographic attacks b. Signal attacks c. Protocol attacks d. Physical attacks

    c. Protocol attacks

40. Masking is related to? a. The optimization of the watermark receiver b. The insertion of the watermark inside the cover c. The formatting of the payload d. The choice of the host locations in the cover

    b. The insertion of the watermark inside the cover

41. What is the cover signal? a. The payload to be added b. The message to be added after some formatting steps c. The audio-visual signal in which data will be hidden d. The protected document

    c. The audio-visual signal in which data will be hidden

42. Which one of these manipulations can be considered as malicious for image authentication a. Histogram equalization b. Image cropping c. JPEG compression d. Low-pass filtering

    b. Image cropping