Types of Historical Ciphers
Question
Which of the following types of ciphers are included in the historical ciphers? Each correct answer represents a complete solution.
Choose two.
Answers
Explanations
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Historical ciphers are encryption techniques that have been used throughout history, often prior to the advent of modern computer-based encryption algorithms. These ciphers can be classified into four major types: substitution ciphers, transposition ciphers, stream ciphers, and block ciphers. Of these four types, substitution and transposition ciphers are considered historical ciphers.
Substitution ciphers replace one letter or character with another. These ciphers are further divided into monoalphabetic ciphers, in which each character in the plaintext is replaced with a fixed character, and polyalphabetic ciphers, which use multiple substitution alphabets. Examples of substitution ciphers include the Caesar cipher and the Vigenère cipher.
Transposition ciphers, on the other hand, rearrange the order of characters in the plaintext to form the ciphertext. Examples of transposition ciphers include the Rail Fence cipher and the Columnar Transposition cipher.
Stream ciphers and block ciphers, on the other hand, are considered modern ciphers. Stream ciphers encrypt data one bit or one byte at a time, while block ciphers encrypt fixed-size blocks of data at once. Examples of modern stream ciphers include RC4 and Salsa20, while examples of modern block ciphers include AES and Blowfish.
In summary, the two types of ciphers that are included in the historical ciphers are substitution ciphers and transposition ciphers.
