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Questions and Answers
What is a substitution cipher?
What is a substitution cipher?
- A cipher that rearranges the order of the letters in the message
- A cipher that replaces each letter in the message with a different letter, following some established mapping (correct)
- A cipher that replaces each letter in the message with the same letter
- A cipher that adds a random letter to each letter in the message
What is the Caesar cipher?
What is the Caesar cipher?
- A cipher that replaces each letter in the message with the same letter
- A cipher that adds a random letter to each letter in the message
- A cipher that rearranges the order of the letters in the message
- A simple example of a substitution cipher that replaces each letter with a letter some fixed number of positions (correct)
What is the purpose of a substitution cipher?
What is the purpose of a substitution cipher?
- To add random letters to a message
- To replace each letter in a message with the same letter
- To rearrange the order of letters in a message
- To translate a message into a secret code (correct)
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Study Notes
Substitution Ciphers
- A substitution cipher is a method of encryption where each plaintext element (e.g., letter, symbol) is replaced by a different element
- It involves replacing each unit of plaintext with a corresponding unit of ciphertext
Caesar Cipher
- A Caesar cipher is a type of substitution cipher where each letter in the plaintext is 'shifted' a certain number of places down the alphabet
- It is a simple and ancient encryption technique
Purpose of Substitution Ciphers
- The primary purpose of a substitution cipher is to conceal the meaning of a message, ensuring only the intended recipient can decipher and read it
- Substitution ciphers are used to provide confidentiality and security to the communication
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