Network Security - Module 15

What is Cryptography?

• The breaking of codes to reveal the hidden information within

• The creation of codes to hide information from unauthorised eyes

• The process of taking plaintext and obscuring it from view

• The process of taking ciphertext and decoding it to plaintext

What does CIA stand for?

• Confidentiality, Integrity, Accessibility

• Confidentiality, Interrogation, Authentication

• Confidentiality, Integrity, Authentication

• Confidentiality, Interrogation, Accessibility

What is Cryptanalysis?

• The breaking of codes to reveal the hidden information within

• The creation of codes to hide information from unauthorised eyes

• The process of taking plaintext and obscuring it from view

• The process of taking ciphertext and decoding it to plaintext

Which of the following is a transposition cipher?

• Caesar cipher

• Scytale cipher

• Vigenère cipher

• Stream cipher

What type of cipher is Vigenère?

• Polyaphabetic

• One-time pad

• Transposition

• Basic substitution

Roughly how long would it take a modern computer to 'brute-force' decode a Caesar cipher?

• Less than 1 second

• About an hour

• About a day

• About a year

• Well over a year

Which "bit" lengths can AES keys be?

• 128

• 192

• 256

• 384

• 512

Roughly how long would it take a modern computer to 'brute-force' decode an AES cipher?

• Less than 1 second

• About an hour

• About a day

• About a year

• Well over a year

Who created the polyaphabetic cipher Vigenère?

• Mary Queen of Scots

• Blaise De Vigenère

• Giovan Battista Bellaso

• Charles Babbage