Module 8 Quiz Flashcards
When you carve a graphics file, recovering the image depends on which of the following skills?
Recovering the image from a tape backup
Recognizing the pattern of the data content
Recognizing the pattern of a corrupt file
Recognizing the pattern of the file header content
Recognizing the pattern of the file header content
Bitmap (.bmp) files use which of the following types of compression?
Lossy
Lossless
WinZip
Lzip
Lossless
What type of compression uses an algorithm that allows viewing the graphics file without losing any portion of the data?
Recursive
Lossy
Vector quantization
Lossless
Lossless
Copyright laws don’t apply to Web sites.
True
False
False
Each type of graphics file has a unique header containing information that distinguishes it from other types of graphics files.
True
False
True
A JPEG file uses which type of compression?
WinZip
Lossless
Lossy
Lzip
Lossy
What methods are used for digital watermarking?
Invisible modification of the LSBs in the file
Implanted subroutines that link to a central Web server automatically when the watermarked file is accessed
Nothing; this is what you’d expect to see.
Using a hex editor to alter the image data
Invisible modification of the LSBs in the file
Which of the following is true about JPEG and TIF files?
They differ from other graphics files because their file headers contain fewer bits.
They have identical values for the first 2 bytes of their file headers.
They differ from other graphics files because their file headers contain more bits.
They have different values for the first 2 bytes of their file headers.
They have different values for the first 2 bytes of their file headers.
What methods do steganography programs use to hide data in graphics files?
Insertion
Substitution
Either of the above
None of the above
Either of the above
When investigating graphics files, you should convert them into one standard format.
True
False
False
To identify an unknown graphics file format you need to examine a copy of the unknown file with a hexadecimal editor to find the hex code for the first several bytes of the file.
True
False
True
Only one file format can compress graphics files.
True
False
False
Digital pictures use data compression to accomplish which of the following goals?
Save space on a hard drive.
Eliminate redundant data.
Provide a crisp and clear image.
All of the above
Save space on a hard drive.
Graphics files stored on a computer can’t be recovered after they are deleted.
True
False
False
Some clues left on a drive that might indicate steganography include which of the following?
Multiple copies of a graphics file
Graphics files with the same name but different file sizes
Steganography programs in the suspect’s All Programs list
All of the above
All of the above
