CISSP-ISSAP · Question #38
Which of the following types of ciphers are included in the historical ciphers? Each correct answer represents a complete solution. Choose two.
The correct answer is B. Transposition ciphers D. Substitution ciphers. Transposition (B) and Substitution (D) ciphers are the two classical historical cipher types, forming the foundation of pre-modern cryptography. Substitution ciphers (like Caesar cipher and Vigenère cipher) replace plaintext characters with other characters, while transposition c
Question
Which of the following types of ciphers are included in the historical ciphers? Each correct answer represents a complete solution. Choose two.
Options
- ABlock ciphers
- BTransposition ciphers
- CStream ciphers
- DSubstitution ciphers
How the community answered
(51 responses)- A4% (2)
- B88% (45)
- C8% (4)
Explanation
Transposition (B) and Substitution (D) ciphers are the two classical historical cipher types, forming the foundation of pre-modern cryptography. Substitution ciphers (like Caesar cipher and Vigenère cipher) replace plaintext characters with other characters, while transposition ciphers rearrange the positions of characters without changing them - both techniques date back thousands of years.
Block ciphers (A) and stream ciphers (C) are modern cryptographic constructs that emerged in the 20th century with the advent of computers; they operate on binary data and are part of symmetric-key cryptography, not historical cipher classifications.
Memory tip: Think "S and T are historical" - Substitution (swap the letters) and Transposition (twist the order). Block and stream ciphers belong to the digital age, so if it sounds like something a computer does, it's modern, not historical.
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