Final answer:
The correct Caesar cipher text for the word STUDY, when shifting five letters to the right, is XYZID.
Therefore, the correct answer is: option E. XYZID
Step-by-step explanation:
The subject of this question is the Caesar cipher, which is a type of substitution cipher where each letter in the plaintext is shifted a certain number of places down or up the alphabet.
The student is asked to identify the cipher text for the word STUDY if the key for this Caesar cipher is shifting five letters to the right.
In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code, or Caesar shift, is one of the simplest and most widely known encryption techniques.
To encrypt the word STUDY using this cipher, we would perform the following shifts: S to X, T to Y, U to Z, D to I, and Y to D. Therefore, the correct cipher text is XYZID.
To decrypt, the receiver reverses the shift. Arab mathematician Al-Kindi broke the Caesar Cipher using frequency analysis, which exploits patterns in letter frequencies.