What is the name for a substitution cipher that shifts the alphabet by 13 places?

The correct answer is C. ROT13 cipher. ROT13 is a special case of the Caesar cipher that shifts each letter of the alphabet by exactly 13 positions. Because the English alphabet has 26 letters, applying ROT13 twice returns the original text, making encryption and decryption identical operations. The generic Caesar…

Submitted by stefanr· Apr 18, 2026Cryptography

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Exhibits

Options

ACaesar cipher
BPolyalphabetic cipher
CROT13 cipher
DTransposition cipher

How the community answered

(21 responses)

B
10% (2)
C
86% (18)
D
5% (1)

Explanation

ROT13 is a special case of the Caesar cipher that shifts each letter of the alphabet by exactly 13 positions. Because the English alphabet has 26 letters, applying ROT13 twice returns the original text, making encryption and decryption identical operations. The generic Caesar cipher uses a fixed shift (traditionally 3). A polyalphabetic cipher uses multiple substitution alphabets (e.g., Vigenère). A transposition cipher rearranges characters rather than substituting them.

Topics

#Cryptography#Substitution Cipher#ROT13#Cipher Types

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