Cryptography

Which strategy uses many layers of security mechanisms to frustrate attackers?

• defense in depth
• single layer security
• encryption
• decryption

Cryptography is roughly translated to what?

• secret writing
• secret codes
• secret language
• secret ciphers

A cipher converts plain text into ___.

• ciphertext
• cleartext
• keytext
• randomtext

What is the process of making text secret called?

• decryption
• encryption
• substitution
• permutation

Julius Caesar used a cipher known as ___.

• columnar cipher
• Caesar cipher
• enigma cipher
• rotor cipher

Substitution ciphers replace each letter in a message with ___.

• something else according to a translation
• the next letter in the alphabet
• a number
• the same letter

The main drawback of basic substitution ciphers is that ___.

• letter frequencies are preserved
• they are too complex
• they change letter frequencies
• they require no key

The breaking of which cipher led to the execution of Mary, Queen of Scots?

• substitution cipher
• Caesar cipher
• permutation cipher
• columnar cipher

A Columnar Transposition Cipher uses a ___.

• wheel
• grid
• codebook
• typewriter

What was the most famous encryption machine used by the Nazis?

• Caesar
• Enigma
• DES
• AES