312-49 · Question #203
Heather, a computer forensics investigator, is assisting a group of investigators working on a large computer fraud case involving over 20 people. These 20 people, working in different offices…
The correct answer is A. Grill cipher. A grille cipher (also spelled 'grill cipher') is a classical cryptographic technique where a physical template - typically a piece of cardboard or plastic - has holes cut out in specific positions. When placed over a page of ordinary-looking text, only the letters or words…
Question
Heather, a computer forensics investigator, is assisting a group of investigators working on a large computer fraud case involving over 20 people. These 20 people, working in different offices, allegedly siphoned off money from many different client accounts. Heather responsibility is to findThese 20 people, working in different offices, allegedly siphoned off money from many different client accounts. Heather? responsibility is to find out how the accused people communicated between each other. She has searched their email and their computers and has not found any useful evidence. Heather then finds some possibly useful evidence under the desk of one of the accused. In an envelope she finds a piece of plastic with numerous holes cut out of it. Heather then finds the same exact piece of plastic with holes at many of the other accused peoples?desks. Heather believes that the 20 people involved in the case were using a cipher to send secret messages in between each other. What type of cipher was used by the accused in this case?
Options
- AGrill cipher
- BNull cipher
- CText semagram
- DVisual semagram
How the community answered
(24 responses)- A83% (20)
- B4% (1)
- C8% (2)
- D4% (1)
Explanation
A grille cipher (also spelled 'grill cipher') is a classical cryptographic technique where a physical template - typically a piece of cardboard or plastic - has holes cut out in specific positions. When placed over a page of ordinary-looking text, only the letters or words visible through the holes form the secret message. The remaining text acts as innocent cover. Finding identical grilles at multiple suspects' locations indicates coordinated covert communication using this method. This differs from a null cipher (hiding a message within innocent text without a physical key), a text semagram (hiding meaning within text formatting), or a visual semagram (hiding meaning within an image or drawing).
Topics
Community Discussion
No community discussion yet for this question.