Unit 1 5 Substitution

What is the Caesar cipher?

• A type of symmetric key cryptography

• A type of encryption algorithm

• A type of substitution cipher

• A type of public key infrastructure

How does the Caesar cipher work?

• Each letter in the plaintext is replaced with a random symbol

• The letters in the plaintext are converted to their ASCII values and then shifted

• The letters in the plaintext are rearranged in a random order

• Each letter in the plaintext is shifted by a certain number of positions down or up the alphabet.

Explain the Playfair cipher.

• The Playfair cipher uses a 3x3 grid of numbers to encrypt messages.

• The Playfair cipher involves shifting each letter in the message by a fixed number of positions in the alphabet.

• The Playfair cipher uses a keyword to create a mixed alphabet which is then used to encrypt the message.

• The Playfair cipher is a cryptographic technique that uses a 5x5 grid of letters to encrypt pairs of letters in a message.

Describe the Rail fence cipher.

• The Rail fence cipher rearranges plaintext letters in a zigzag pattern.

• The Rail fence cipher rearranges plaintext letters in a random pattern.

• The Rail fence cipher rearranges plaintext letters in a circular pattern.

• The Rail fence cipher rearranges plaintext letters in a straight line.

What is the Simple substitution cipher?

• A method of encryption using word substitution

• A method of encryption using number substitution

• A method of encryption using letter substitution

• A method of encryption using symbol substitution