Substitution Ciphers

What are the main types of substitution ciphers?

• Vigenère cipher

• Transposition cipher

• Caesar cipher, monoalphabetic cipher

• Playfair cipher

How do you decrypt a message that has been encoded with a substitution cipher?

• Use a random key to shift all letters by three positions.

• Reverse the order of the letters in the message.

• Replace each letter in the encoded message with its corresponding original letter based on the identified substitution pattern.

• Replace all vowels with the letter 'X' regardless of their position.

What are some real-world applications of substitution ciphers?

• Cooking recipes

• Social media marketing

• Military communications, corporate data encryption, puzzles and games, educational tools.

• Weather forecasting tools

What is a common method for creating a substitution cipher?

• Using a random key to replace letters.

• Shifting letters by a fixed number of positions.

• Creating a keyword that determines the letter substitutions.

• Reversing the alphabet to create a mirror cipher.

What role does the key play in a substitution cipher?

• The key determines the method of encryption.

• The key is used to decrypt the message.

• The key defines the specific letter substitutions.

• The key is irrelevant in substitution ciphers.