i1_Tle_euro_cryptography

1. What is the main objective of cryptography?

• To prevent file copying

• To allow data backup

• To ensure the confidentiality and security of information

• To easily share files

1. What term refers to the readable message before it is encrypted?

• Ciphertext

• Encryption

• Plaintext

• Cleartext

Which of the following sentences is an example of a transposition cipher?

• The word "hello" becomes "khoor"

• The word "hello world" becomes "ehlol owrdl

• Letters are replaced with numbers

• The word "fly" becomes "gmz"

1. How does a substitution cipher work?

• By changing the order of letters in a word

• By replacing each letter with another letter or group of letters

• By adding numbers between letters

• By rearranging words in the sentence

1. Caesar cipher consists of:

• Replacing each letter with its opposite in the alphabet

• Adding symbols between each letter

• Replacing letters with numbers

• Shifting each letter a few positions in the alphabet

1. With a key of 3, how would the word "CAT" be encrypted using the Caesar cipher?

• DBU

• ECV

• FDW

• CZU

1. Why are simple encryption techniques like the Caesar cipher not very secure?

• Because they use random numbers

• Because they don’t change the order of letters

• Because they are easy to break

• Because they require too many keys

1. What is steganography?

• Concealing the existence of a message

• The art of encrypting messages with a key

• Creating messages with symbols

• Using multiple keys for a message

1. What is the primary function of the Enigma machine?

• To encode messages to make them incomprehensible

• To transmit radio signals over long distances

• To decode messages from other nations

• To calculate the speed of enemy ships

1. Who used the Enigma machine, and in what context?

• German diplomats for trade negotiations in the 1930s

• German military during World War II to secure communications

• British spies during the Cold War

• American mathematicians during World War II