6.1 History of Cryptography

When were substitution ciphers first found to be used?

• Around 500 BC

• Around 100 BC

• 19th century

• 20th century

What is the flaw in the Caesar cipher?

• Once the key is known, the secret is out

• It is too complex to use

• It can only encrypt numbers, not letters

• It requires a physical machine to encrypt

What was the name of the electromechanical contraption designed by Edward Hepburn?

• Hepburn rotor machine

• Enigma

• Caesar cipher

• Substitution cipher

How many rotors did the Enigma machine have?

• 1

• 2

• 3

• 4

What did the randomized plug board in the Enigma machine do?

• Added multiple new rules to the encryption

• Rotated the rotors

• Reflected the letters

• Decrypted the messages

What was the approximate number of settings to guess on the Enigma machine?

• 158 quintillion

• 1 million

• 100 billion

• 10 trillion

Who invented machines to break the Enigma code?

• Alan Turing

• Edward Hepburn

• Julius Caesar

• Edward Snowden

What is modern cryptography used for?

• Top-secret government documents

• Personal digital lives

• Both A and B

• None of the above

What is an example of a personal digital use of cryptography?

• Logging into a code HS account

• Encrypting government documents

• Breaking the Enigma code

• Creating substitution ciphers

What is the importance of adding a layer of protection to your data?

• To keep it safe from hackers

• To make it more difficult to access

• To prevent unauthorized access

• All of the above