Which cipher uses a reversed alphabet as its basis?

The Atbash Cipher is based on a simple substitution mechanism where each letter in the alphabet is replaced by its reverse counterpart. For instance, 'A' becomes 'Z', 'B' becomes 'Y', and so on, effectively mapping the first letter of the alphabet to the last and continuing inward. This results in a straightforward but effective means of encoding messages, as it allows for an easily reversible process. The Atbash Cipher stands out due to its unique approach of utilizing the entire alphabet in reverse order, creating a symmetrical encryption method that is both simple to implement and decode.

In contrast, the Caesar Cipher shifts letters by a fixed number of places rather than reversing the alphabet, and the Vigenère Cipher employs a keyword to determine the shifting, which adds complexity and eliminates the simple reversal characteristic of the Atbash. The Rotating Cube Cipher involves three-dimensional manipulation and is entirely different in its approach to encoding and decoding messages. These distinctions highlight why the Atbash Cipher is the answer focused on the use of a reversed alphabet.